S-8355/56/57/58 Series
www.sii-ic.com
STEP-UP, SUPER-SMALL PACKAG E, 600 kHz, PWM CONTROL o
r
PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
© Seiko Instruments Inc., 2002-2010
Rev.7.0_00
Seiko Instruments Inc. 1
The S-8355/56/57/58 Series is a CMOS step-up s witching regulator controller which mainly consists of a reference voltage
source, an oscillation circuit, an error amplifier, a phase com pensation circuit, a PWM control circuit (S-8355/57 Series) and
a PWM/PFM switching control circuit (S-8356/58 Series).
With an external low-ON-resistance Nch Power MOS, this product is ideal for applications requiring high efficiency and a
high output current.
The S-8355/57 Series realizes low ripple, high efficiency, and excellent transient characteristics due to its PWM control
circuit whose duty ratio can be varied linearl y from 0 to 83% (from 0 to 78% for 250 kHz, 300 kHz, and 600 kHz models), an
excellently designe d error amplifier and a phase comp ensation circuits.
S-8356/58 Series features a PWM/PFM switching controller that can switch the operation to a PFM controller with a duty
ratio is 15% under a light load to prevent a decline in the efficiency due to the IC operating current.
Features
• Low voltage operation : Startup at 0.9 V min. (IOUT = 1 mA) guaranteed
• Low current consumption : During operation 25.9 μA (3.3 V, 100 kHz, typ.)
During shutdown 0.5 μA (max.)
• Duty ratio : Built-in PWM/PFM switching control circuit (S-8356/58 Series)
15 to 83% (100 kHz models)
15 to 78% (250 kHz, 300 kHz, and 600 kHz models)
• External parts : Coil, diode, capacitor, and transistor
• Output voltage : Selectable in 0.1 V steps between 1.5 and 6.5 V (for VDD / VOUT separate types)
Selectable in 0.1 V steps between 2.0 and 6.5 V (for other than VDD / VOUT separate types)
• Output voltage accuracy : ±2.4%
• Oscillation frequency : 100 kHz, 250 kHz, 300 kHz, 600 kHz selectable
• Soft start function : 6 ms (100 kHz, typ.)
• Shutdown function
• Lead-free, Sn 100%, halogen-free*1
*1. Refer to “ Product Name Structure” for details.
Applications
• Power supplies for portable equipme nt such as digital cameras, electronic notebooks, and PDAs
• Power supplies for audio equipm ent such as portable CD / MD players
• Constant voltage power supplies for cameras, VCRs, and communication s devices
• Power supplies for microcomputers
Packages
• SOT-23-3
• SOT-23-5
• SOT-89-3
• 6-Pin SNB(B)
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series Rev.7.0_00
Seiko Instruments Inc.
2
Block Diagrams
(1) S-8357/58 Series B, H and F Types
(Without Shutdown Function) (2) S-8357/58 Series B, H, F and N T ypes
(With Shutdown Function)
VOUT
EXT
VSS
PWMco ntro l ci rcuit or
PWM / P FM swit ching
control circuit
Oscillation circuit
Soft start bu ilt-in
reference power
supply
Phase
compensation
circuit
IC internal
power supply
+
−
VOUT
VSS
EXT
Phase
compensation
circuit
Soft start bu ilt-in
reference power
supply
PWMcont rol ci rcuit or
PWM / PFM switch ing
cont rol c ircui t
Oscillation circuit
OFF/ON
IC internal
power
supply
+
−
Figure 1 Figure 2
(3) S-8357/58 Series E, J, G and P Types
(VDD / VOUT Separate Type) (4) S-8355/56 Series K, L, M and Q Types
(With Shutdown Function, VDD / VOUT Separate Type)
EXT
VSS
Oscillation circuit
PWMcont rol ci rcuit or
PWM / PFM switch ing
cont rol c ircui t
Soft start bu ilt-in
reference power
supply
VOUTVDD
Phase
compensation
circuit
IC internal
power
supply
+
−
EXT
VDD VOUT
VSS
Oscillation circuit
PWMcont rol ci rcuit or
PWM / PFM switch ing
cont rol c ircui t
+
−
Soft start bu ilt-in
reference power
supply
Phase
compensation
circuit
IC internal
power
supply
OFF/ON
Figure 3 Figure 4
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0_00 S-8355/56/57/58 Series
Seiko Instruments Inc. 3
Product Name Structure
The control system, product types, o utput voltage, and p ackages for the S-8355/56/57/58 Series c an be selected at the
user’s request. Please refer to the “3. Product Name” for the definition of the product name, “4. Package” regarding the
package drawings and “5. Product Name List” for the full product names.
1. Function List
(1) PWM Control Products
Table 1
Product Name Switching
Frequency
kHz
Shutdown
Function
VDD / VOUT
Separate
Typ e Package Application
S-8355KxxMC 100 Yes Yes SOT-23-5
Applications requiring variable output voltage
and a shutdown function
S-8355LxxMC,
S-8355LxxBD 250 Yes Yes
SOT-23-5,
6-Pin SNB(B) Applications requiring variable output voltage,
a shutdown function, and a thin coil
S-8355MxxMC,
S-8355MxxBD 300 Yes Yes
SOT-23-5,
6-Pin SNB(B) Applications requiring variable output voltage,
a shutdown function, and a thin coil
S-8355QxxMC,
S-8355QxxBD 600 Yes Yes
SOT-23-5,
6-Pin SNB(B) Applications requiring variable output voltage,
a shutdown function, and a thin coil
S-8357BxxMC 100 Yes − SOT-23-5 Applications requiring a shutdown function
S-8357BxxMA 100 − − SOT-23-3 Applications not requiring a shutdown function
S-8357BxxUA 100 − − SOT-89-3 Applications not requiring a shutdown function
S-8357ExxMC 100 − Yes SOT-23-5
Applications in which output voltage is
adjusted by external resistor
S-8357FxxMC,
S-8357FxxBD 300 Yes − SOT-23-5,
6-Pin SNB(B) Applications requiring a shutdown function
and a thin coil
S-8357GxxMC,
S-8357GxxBD 300 − Yes
SOT-23-5,
6-Pin SNB(B) Applications requiring variable output voltage
and a thin coil
S-8357HxxMC,
S-8357HxxBD 250 Yes − SOT-23-5,
6-Pin SNB(B) Applications requiring a shutdown function
and a thin coil
S-8357JxxMC,
S-8357JxxBD 250 − Yes
SOT-23-5,
6-Pin SNB(B) Applications requiring variable output voltage
with an external resistor and a thin coil
S-8357NxxMC,
S-8357NxxBD 600 Yes − SOT-23-5,
6-Pin SNB(B) Applications requiring a shutdown function
and a thin coil
S-8357PxxMC,
S-8357PxxBD 600 − Yes
SOT-23-5,
6-Pin SNB(B) Applications requiring variable output voltage
with an external resistor and a thin coil
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series Rev.7.0_00
Seiko Instruments Inc.
4
(2) PWM / PFM Switching Control Products
Table 2
Product Name Switching
Frequency
kHz
Shutdown
Function
VDD / VOUT
Separate
Typ e Package Application
S-8356KxxMC 100 Yes Yes SOT-23-5
Applications requiring variable output voltage
and a shutdown function
S-8356LxxMC,
S-8356LxxBD 250 Yes Yes
SOT-23-5,
6-Pin SNB(B) Applications requiring variable output voltage,
a shutdown function, and a thin coil
S-8356MxxMC,
S-8356MxxBD 300 Yes Yes
SOT-23-5,
6-Pin SNB(B) Applications requiring variable output voltage,
a shutdown function, and a thin coil
S-8356QxxMC,
S-8356QxxBD 600 Yes Yes
SOT-23-5,
6-Pin SNB(B) Applications requiring variable output voltage,
a shutdown function, and a thin coil
S-8358BxxMC 100 Yes − SOT-23-5 Applications requiring a shutdown function
S-8358BxxMA 100 − − SOT-23-3 Applications not requiring a shutdown function
S-8358BxxUA 100 − − SOT-89-3 Applications not requiring a shutdown function
S-8358ExxMC 100 − Yes SOT-23-5
Applications in which output voltage is
adjusted by external resistor
S-8358FxxMC,
S-8358FxxBD 300 Yes − SOT-23-5,
6-Pin SNB(B) Applications requiring a shutdown function
and a thin coil
S-8358GxxMC,
S-8358GxxBD 300 − Yes
SOT-23-5,
6-Pin SNB(B) Applications requiring variable output voltage
and a thin coil
S-8358HxxMC,
S-8358HxxBD 250 Yes − SOT-23-5,
6-Pin SNB(B) Applications requiring a shutdown function
and a thin coil
S-8358JxxMC,
S-8358JxxBD 250 − Yes
SOT-23-5,
6-Pin SNB(B) Applications requiring variable output voltage
with an external resistor and a thin coil
S-8358NxxMC,
S-8358NxxBD 600 Yes − SOT-23-5,
6-Pin SNB(B) Applications requiring a shutdown function
and a thin coil
S-8358PxxMC,
S-8358PxxBD 600 − Yes
SOT-23-5,
6-Pin SNB(B) Applications requiring variable output voltage
with an external resistor and a thin coil
2. Package and Function List by Product Type
Table 3
Series Name Type Package Name
(Abbreviation) Shutdown Function
Yes / No
VDD / VOUT Separate
Type
Yes / No
S-8355 Series,
S-8356 Series K, L, M, Q (Shutdown function + VDD / VOUT
separate type)
K = 100 kHz, L = 250 kHz, M = 300 kHz,
Q = 600 kHz
MC / BD Yes Yes
MA / UA No
S-8357 Series B, H, F (Normal product)
B = 100 kHz, H = 250 kHz, F = 300 kHz MC / BD Yes No
N (Normal product)
N = 600 kHz MC / BD Yes No
E, J, G, P (VDD / V OUT separate type)
E = 100 kHz, J = 250 kHz, G = 300 kHz,
P = 600 kHz MC / BD No Yes
MA / UA No
S-8358 Series B, H, F (Normal product)
B = 100 kHz, H = 250 kHz, F = 300 kHz MC / BD Yes No
N (Normal product)
N = 600 kHz MC/BD Yes No
E, J, G, P (VDD / V OUT separate type)
E = 100 kHz, J = 250 kHz, G = 300 kHz,
P = 600 kHz MC / BD No Yes
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0_00 S-8355/56/57/58 Series
Seiko Instruments Inc. 5
3. Product Name
(1) SOT-23-3 Packages
S-835 x x xx MA - xxx T2 G
Environmental code
G : Lead-free (for details, please contact our sales office)
IC direction in t ape s pec ifications *1
T2 : SOT-23-3
Product nam e (a bbreviation) *2
Package name (abbreviation)
MA : SOT-23-3
Output voltage
15 to 65
(e.g. When the output voltage is 1.5 V, it is exp re s s ed as 15.)
Product type
B : Normal product, fOSC = 100 kHz
(S-8357/58 Series)
H : Normal product, fOSC = 250 kHz
(S-8357/58 Series)
F : Normal product, fOSC = 300 kHz
(S-8357/58 Series)
N : Normal product, fOSC = 600 kHz
(S-8357/58 Series)
E : VDD / VOUT separate type, fOSC = 100 kHz
(S-8357/58 Series)
J : VDD / VOUT separate type, fOSC = 250 kHz
(S-8357/58 Series)
G : VDD / VOUT separate type, fOSC = 300 kHz
(S-8357/58 Series)
P : VDD / VOUT separate type, fOSC = 600 kHz
(S-8357/58 Series)
K : With shutdown function + VDD / VOUT separate type, fOSC = 100 kHz
(S-8355/56 Series)
L : With shutdo wn functio n + VDD / VOUT separate type, fOSC = 250 kHz
(S-8355/56 Series)
M : With shutdo wn functio n + VDD / VOUT separate type, fOSC = 300 kHz
(S-8355/56 Series)
Q : With shutdo wn functio n + VDD / VOUT separate type, fOSC = 600 kHz
(S-8355/56 Series)
Control system
5 or 7 : PWM control
6 or 8 : PWM / PF M switching co nt ro l
*1. Refer to the tape specificat ions.
*2. Refer to the Table 4 to Table 13 in the “5. Product Name List”.
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series Rev.7.0_00
Seiko Instruments Inc.
6
(2) SOT-23-5, SOT-89-3 Packages
S-835 x x xx xx - xxx T2 x
Environmental code
U : Lead-free (Sn 100%), halogen-free
G : Lead-free (for details, please contact our sales office)
IC direction in t ape s pec ifications *1
T2 : SOT-23-5, SO T-89-3
Product nam e (a bbreviation) *2
Package name (abbreviation)
MC : SOT-23-5
UA : SOT-89-3
Output voltage
15 to 65
(e.g. W hen the output vo lta ge is 1.5 V, it is expressed as 15.)
Product type
B : Normal product, fOSC = 100 kHz
(S-8357/58 Series)
H : Normal product, fOSC = 250 kHz
(S-8357/58 Series)
F : Normal product, fOSC = 300 kHz
(S-8357/58 Series)
N : Normal product, fOSC = 600 kHz
(S-8357/58 Series)
E : VDD / VOUT separate type, fOSC = 100 kHz
(S-8357/58 Series)
J : VDD / VOUT separate type, fOSC = 250 kHz
(S-8357/58 Series)
G : VDD / VOUT separate type, fOSC = 300 kHz
(S-8357/58 Series)
P : VDD / VOUT separate type, fOSC = 600 kHz
(S-8357/58 Series)
K : With shutdown function + VDD / VOUT separate type, fOSC = 100 kHz
(S-8355/56 Series)
L : With shutdo wn functio n + VDD / VOUT separate type, fOSC = 250 kHz
(S-8355/56 Series)
M : With shutdo wn functio n + VDD / VOUT separate type, fOSC = 300 kHz
(S-8355/56 Series)
Q : With shutdo wn functio n + VDD / VOUT separate type, fOSC = 600 kHz
(S-8355/56 Series)
Control system
5 or 7 : PWM control
6 or 8 : PWM / PF M switching co nt ro l
*1. Refer to the tape specificat ions.
*2. Refer to the Table 4 to Table 13 in the “5. Product Name List”.
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0_00 S-8355/56/57/58 Series
Seiko Instruments Inc. 7
(3) 6-Pin SNB(B) Package
S-835 x x xx BD - xxx - TF
IC direction in tape specifications*1
TF : 6-Pin SNB(B)
Product name (abb reviation) *2
Package name (a bbreviation)
BD : 6-Pin SNB(B)
Output voltage
15 to 65
(e.g. When the output voltage is 1.5 V, it is expressed as 15.)
Product type
B : Normal product, fOSC = 100 kHz
(S-8357/58 Series)
H : Normal product, fOSC = 250 kHz
(S-8357/58 Series)
F : Normal product, fOSC = 300 kHz
(S-8357/58 Series)
N : Normal product, fOSC = 600 kHz
(S-8357/58 Series)
E : VDD / VOUT separate type, fOSC = 100 kHz
(S-8357/58 Series)
J : VDD / VOUT separate type, fOSC = 250 kHz
(S-8357/58 Series)
G : VDD / VOUT separate type, fOSC = 300 kHz
(S-8357/58 Series)
P : VDD / VOUT separate type, fOSC = 600 kHz
(S-8357/58 Series)
K : With shutdown function + VDD / VOUT separate type, fOSC = 100 kHz
(S-8355/56 Series)
L : With shutdown function + VDD / VOUT separate type, fOSC = 250 kHz
(S-8355/56 Series)
M : With shutdown function + VDD / VOUT separate type, fOSC = 300 kHz
(S-8355/56 Series)
Q : With shutdown function + VDD / VOUT separate type, fOSC = 600 kHz
(S-8355/56 Series)
Control system
5 or 7 : PWM control
6 or 8 : PWM / PFM switching control
*1. Refer to the tape specificat ions.
*2. Refer to the Table 4 to Table 13 in the “5. Product Name List”.
4. Package
Drawing Code
Package Name Package Tape Reel
SOT-23-3 MP003-A-P-SD MP003-A-C-SD MP003-A-R-SD
SOT-23-5 MP005-A-P-SD MP005-A-C-SD MP005-A-R-SD
SOT-89-3 UP003-A-P-SD UP003-A-C-SD UP003-A-R-SD
6-Pin SNB(B) BD006-A-P-SD BD006-A-C-SD BD006-A-R-SD
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series Rev.7.0_00
Seiko Instruments Inc.
8
5. Product Name List
(1) S-8355 Series
Table 4
Output
voltage S-8355KxxMC
Series S-8355LxxMC
Series S-8355MxxMC
Series S-8355MxxBD
Series
1.5 V − S-8355L15MC-NCAT2x − −
1.8 V S-8355K18MC-NADT2x − S-8355M18MC-MCDT2x S-8355M18BD-MCD-TF
2.0 V S-8355K20MC-NAFT2x S-8355L20MC-NCFT2x S-8355M20MC-MCFT2x −
2.4 V S-8355K24MC-NAJT2x − − −
3.0 V S-8355K30MC-NAPT2x − S-8355M30MC-MCPT2x −
3.1 V S-8355K31MC-NAQT2x − S-8355M31MC-MCQT2x −
3.2 V − − S-8355M32MC-MCRT2x −
3.3 V S-8355K33MC-NAST2x − − −
3.4 V − − S-8355M34MC-MCTT2x S-8355M34BD-MCT-TF
5.0 V S-8355K50MC-NBJT2x − S-8355M50MC-MDJT2x −
5.5 V − − S-8355M55MC-MDOT2x −
6.0 V − − S-8355M60MC-MDTT2x −
6.5 V − − S-8355M65MC-MDYT2x −
Table 5
Output
voltage S-8355QxxMC
Series S-8355QxxBD
Series
1.5 V S-8355Q15MC-OWAT2x S-8355Q15BD-OWA-TF
1.8 V S-8355Q18MC-OWDT2x −
2.0 V S-8355Q20MC-OWFT2x −
2.4 V S-8355Q24MC-OWJT2x −
2.8 V S-8355Q28MC-OWNT2x S-8355Q28BD-OWN-TF
3.0 V S-8355Q30MC-OWPT2x −
3.1 V S-8355Q31MC-OWQT2x S-8355Q31BD-OWQ-TF
3.3 V S-8355Q33MC-OWST2x −
3.4 V S-8355Q34MC-OWTT2x S-8355Q34BD-OWT-TF
4.5 V S-8355Q45MC-OXET2x −
5.0 V S-8355Q50MC-OXJT2x S-8355Q50BD-OXJ-TF
5.1 V S-8355Q51MC-OXKT2x −
6.0 V S-8355Q60MC-OXTT2x −
Remark 1. Please contact the SII marketing department for products with an output voltage other than those specified above.
2. x: G or U
3. Please select products of environmental cod e = U for Sn 100%, halogen-free products.
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0_00 S-8355/56/57/58 Series
Seiko Instruments Inc. 9
(2) S-8356 Series
Table 6
Output
voltage S-8356KxxMC
Series S-8356LxxMC
Series S-8356MxxMC
Series S-8356MxxBD
Series
1.5 V − − S-8356M15MC-MEAT2x −
1.8 V S-8356K18MC-NEDT2x − S-8356M18MC-MEDT2x S-8356M18BD-MED-TF
3.0 V S-8356K30MC-NEPT2x S-8356L30MC-NGPT2x S-8356M30MC-MEPT2x −
3.1 V − − S-8356M31MC-MEQT2x −
3.3 V S-8356K33MC-NEST2x − S-8356M33MC-MEST2x −
3.5 V − − S-8356M35MC-MEUT2x −
3.6 V S-8356K36MC-NEVT2x − S-8356M36MC-MEVT2x −
4.0 V S-8356K40MC-NEZT2x − − −
5.0 V S-8356K50MC-NFJT2x − S-8356M50MC-MFJT2x S-8356M50BD-MFJ-TF
Table 7
Output
voltage S-8356QxxMC
Series S-8356QxxBD
Series
1.8 V S-8356Q18MC-OYDT2x S-8356Q18BD-OYD-TF
2.8 V S-8356Q28MC-OYNT2x −
3.0 V S-8356Q30MC-OYPT2x −
3.1 V S-8356Q31MC-OYQT2x −
3.3 V S-8356Q33MC-OYST2x S-8356Q33BD-OYS-TF
3.5 V S-8356Q35MC-OYUT2x −
3.7 V − S-8356Q37BD-OYW-TF
4.0 V S-8356Q40MC-OYZT2x −
5.0 V S-8356Q50MC-OVJT2x S-8356Q50BD-OVJ-TF
5.3 V S-8356Q53MC-OVMT2x −
Remark 1. Please contact the SII marketing department for products with an output voltage other than those specified above.
2. x: G or U
3. Please select products of environmental cod e = U for Sn 100%, halogen-free products.
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series Rev.7.0_00
Seiko Instruments Inc.
10
(3) S-8357 Series
Table 8
Output
voltage S-8357BxxMC
Series S-8357 BxxM A
Series S-8357BxxUA
Series S-8357ExxMC
Series
1.5 V − − − S-8357E15MC-NKAT2x
2.0 V − − − S-8357E20MC-NKFT2x
2.5 V S-8357B25MC-NIKT2x − − −
2.6 V S-8357B26MC-NILT2x − − −
2.7 V S-8357B27MC-NIMT2x − − −
2.8 V S-8357B28MC-NINT2x − − −
3.0 V S-8357B30MC-NIPT2x S-8357B30MA-NIPT2G − S-8357E30MC-NKPT2x
3.3 V S-8357B33MC-NIST2x S-8357B33MA-NIST2G S-8357B33UA-NIST2x −
3.6 V S-8357B36MC-NIVT2x − − −
3.8 V − − S-8357B38UA-NIXT2x −
4.0 V S-8357B40MC-NIZT2x − − −
4.8 V S-8357B48MC-NJHT2x − S-8357B48UA-NJHT2x −
5.0 V S-8357B50MC-NJJT2x S-8357B50MA-NJJT2G S-8357B50UA-NJJT2x S-8357E50MC-NLJT2x
5.2 V S-8357B52MC-NJLT2x − − −
5.4 V S-8357B54MC-NJNT2x − − −
6.0 V S-8357B60MC-NJTT2x − − −
Table 9
Output
voltage S-8357FxxMC
Series S-8357GxxMC
Series S-8357HxxMC
Series S-8357JxxMC
Series
2.0 V − − − S-8357J20MC-NOFT2x
2.5 V − − − S-8357J25MC-NOKT2x
3.0 V S-8357F30MC-MGPT2x − S-8357H30MC-NMPT2G −
3.1 V − − S-8357H31MC-NMQT2G −
3.2 V S-8357F32MC-MGRT2x S-8357G32MC-MIRT2x − −
3.3 V S-8357F33MC-MGST2x S-8357G33MC-MIST2x − −
3.5 V − − S-8357H35MC-NMUT2x −
3.6 V S-8357F36MC-MGVT2x − S-8357H36MC-NMVT2x −
4.2 V − − S-8357H42MC-NNBT2x −
5.0 V S-8357F50MC-MHJT2x S-8357G50MC-MJJT2x S-8357H50MC-NNJT2x S-8357J50MC-NPJT2x
5.2 V S-8357F52MC-MHLT2x − S-8357H52MC-NNLT2x −
6.5 V S-8357F65MC-MHYT2x − − −
Table 10
Output
voltage S-8357JxxBD
Series S-8357NxxM C
Series
3.0 V − S-8357N30MC-O2PT2x
3.3 V − S-8357N33MC-O2ST2x
5.0 V S-8357J50BD-NPJ-TF S-8357N50MC-O3JT2x
5.3 V − S-8357N53MC-O3MT2x
Remark 1. Please contact the SII marketing department for products with an output voltage other than those specified above.
2. x: G or U
3. Please select products of environmental cod e = U for Sn 100%, halogen-free products.
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0_00 S-8355/56/57/58 Series
Seiko Instruments Inc. 11
(4) S-8358 Series
Table 11
Output
voltage S-8358BxxMC
Series S-8358 BxxM A
Series S-8358BxxUA
Series S-8358ExxMC
Series
2.0 V − − − S-8358E20MC-NSFT2x
2.3 V S-8358B23MC-NQIT2x − − −
2.5 V S-8358B25MC-NQKT2x − − −
2.6 V S-8358B26MC-NQLT2x − − −
2.7 V S-8358B27MC-NQMT2x − − −
2.8 V S-8358B28MC-NQNT2x − − −
3.0 V S-8358B30MC-NQPT2x S-8358B30MA-NQPT2G − −
3.1 V S-8358B31MC-NQQT2x − − −
3.2 V S-8358B32MC-NQRT2x − − −
3.3 V S-8358B33MC-NQST2x − S-8358B33UA-NQST2x −
3.5 V S-8358B35MC-NQUT2x − − −
3.6 V S-8358B36MC-NQVT2x − − −
3.8 V S-8358B38MC-NQXT2x − − −
4.0 V S-8358B40MC-NQZT2x − − −
5.0 V S-8358B50MC-NRJT2x S-8358B50MA-NRJT2G S-8358B50UA-NRJT2x S-8358E50MC-NTJT2x
5.3 V S-8358B53MC-NRMT2x − − −
6.0 V S-8358B60MC-NRTT2x − S-8358B60UA-NRTT2x −
Table 12
Output
voltage S-8358FxxMC
Series S-8358GxxMC
Series S-8358HxxMC
Series S-8358JxxMC
Series
2.3 V − − S-8358H23MC-NUIT2x −
2.6 V S-8358F26MC-MKLT2x − − −
2.7 V S-8358F27MC-MKMT2x − − −
3.0 V S-8358F30MC-MKPT2x − S-8358H30MC-NUPT2x −
3.2 V － − S-8358H32MC-NURT2x −
3.3 V S-8358F33MC-MKST2x − S-8358H33MC-NUST2x S-8358J33MC-NWST2x
3.6 V S-8358F36MC-MKVT2x − − −
4.0 V － − S-8358H40MC-NUZT2x −
5.0 V S-8358F50MC-MLJT2x S-8358G50MC-MNJT2x S-8358H50MC-NVJT2x S-8358J50MC-NXJT2x
5.3 V S-8358F53MC-MLMT2x − − −
5.7 V S-8358F57MC-MLQT2x − − −
6.0 V S-8358F60MC-MLTT2x − − −
Table 13
Output
voltage S-8358NxxMC
Series S-8358PxxMC
Series
2.0 V − S-8358P20MC-O8FT2x
3.0 V S-8358N30MC-O6PT2x −
3.3 V S-8358N33MC-O6ST2x −
5.0 V S-8358N50MC-O7JT2x −
5.2 V − S-8358P52MC-O9LT2x
5.3 V S-8358N53MC-O7MT2x −
Remark 1. Please contact the SII marketing department for products with an output voltage other than those specified above.
2. x: G or U
3. Please select products of environmental cod e = U for Sn 100%, halogen-free products.
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series Rev.7.0_00
Seiko Instruments Inc.
12
Pin Configurations
Table 14 S-8357/58 Series B, H and F Types
(Without shutdown function, VDD / VOUT non-separate type)
Pin No. Symbol Pin Description
1 VOUT Output voltage pin and IC power supply pin
2 VSS GND pin
3 EXT External transistor connecti on pin
1
2 3
SOT-2 3 -3
Top view
Figure 5
Table 15 S-8355/56 Series K, L, M and Q Types
(With shutdown function, VDD / VOUT separate type)
Pin No. Symbol Pin Description
1 VOUT Output voltage
2 VDD IC power supply pi n
3 OFF/ON
Shutdown pin
“H”: Normal operation (Step-up operating)
“L”: Step-up stopped (Entire circuit stopped)
4 VSS GND pin
SOT-23-5
Top view
5 4
3 2 1
5 EXT External transistor connection pin
Figure 6
Table 16 S-8357/58 Series B, H, F and N Types
(With shutdown function, VDD / VOUT non-separate type)
Pin No. Symbol Pin Description
1 OFF/ON
Shutdown pin
“H”: Normal operation (Step-up operating)
“L”: Step-up stopped (Entire circuit stopped)
2 VOUT Output voltage pin and IC po wer supply pin
3
NC*1 No connection
4 VSS GND pin
5 EXT External transi stor connection pin
*1. The NC pin indicates electrically open.
Table 17 S-8357/58 Series E, J, G and P Types
(Without shutdown function, VDD / VOUT separate type)
Pin No. Symbol Pin Description
1 VOUT Output voltage pin
2 VDD IC power supply pin
3
NC*1 No connection
4 VSS GND pin
5 EXT External transi stor connection pin
*1. The NC pin indicates electrically open.
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0_00 S-8355/56/57/58 Series
Seiko Instruments Inc. 13
Table 18 S-8357/58 Series B, H and F Types
(Without shutdown function, VDD / VOUT non-separate type)
Pin No. Symbol Pin Description
1 VSS GND pin
2 VOUT Output voltage pin and IC power supply pin
3 EXT External transistor connection pin
SOT-89-3
Top view
3
2 1
Figure 7
Table 19 S-8355/56 Series K, L, M and Q Types
(With shutdown function, VDD / VOUT separate type)
Pin No. Symbol Pin Description
1 OFF/ON Shutdown pin
“H”: Normal operation (Step-up operating)
“L”: Step-up stopped (Entire circuit stopped)
2 VOUT Output voltage pin
3 VDD IC power supply pin
4 EXT External transi stor connection pin
5
NC*1 No connection
6 VSS GND pin
*1. The NC pin indic ates el ectrically open.
Table 20 S-8357/58 Series B, H, F and N Types
(With shutdown function, VDD / VOUT non-separate type)
Pin No. Symbol Pin Description
1 NC*1 No connection
2 OFF/ON Shutdown pin
“H”: Normal operation (Step-up operating)
“L”: Step-up stopped (Entire circuit stopped)
3 VOUT Output voltage pin and IC po wer supply pin
4 EXT
External transistor connecti on pin
5 NC*1 No connection
6 VSS GND pin
*1. The NC pin indic ates el ectrically open.
6-Pin SNB(B)
Top view
6
5
4
1
2
3
4
5
6
3
2
1
Bottom view
*1
*1.
Connect the heatsink of
back side at shadowed
area t o t he boar d, and set
electric potential open or
VDD.
Howev er, do not use it as
the funct ion of electr ode.
Figure 8 Table 21 S-8357/58 Series E, J, G and P Types
(Without shutdown function, VDD / VOUT separate type)
Pin No. Symbol Pin Description
1
NC*1 No connection
2 VOUT Output voltage pin
3 VDD IC power supply pin
4 EXT External transistor connection pin
5
NC*1 No connection
6 VSS GND pin
*1. The NC pin indicates electrically open.
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series Rev.7.0_00
Seiko Instruments Inc.
14
Absolute Maximum Ratings
Table 22 (Ta = 25°C unless otherwise specified)
Item Symbol Absolute maximum rating Unit
VOUT pin voltage VOUT V
SS − 0.3 to VSS + 12 V
OFF/ON pin voltage *1 OFF/ON
V VSS − 0.3 to VSS + 12 V
VDD pin voltage *2 VDD V
SS − 0.3 to VSS + 12 V
B, H, F, N type VSS − 0.3 to VOUT + 0.3 V
EXT pin voltage Others VEXT VSS − 0.3 to VDD + 0.3 V
EXT pin current IEXT ±80 mA
150 (When not mounted on board) mW
SOT-23-3 430*3 mW
250 (When not mounted on board) mW
SOT-23-5 600*3 mW
500 (When not mounted on board) mW
SOT-89-3 1000*3 mW
90 (When not mounted on board) mW
Power dissipation
6-Pin SNB(B)
PD
450*3 mW
Operating ambient temperature Topr − 40 to + 85 °C
Storage temperature Tstg − 40 to + 125 °C
*1. With shutdown function
*2. For VDD / VOUT separate type
*3. When mounted on board
[Mounted board]
(1) Board size : 114.3 mm × 76.2 mm × t1.6 mm
(2) Name : JEDEC STANDARD51-7
Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical
damage. These values must therefore not be exceeded under any conditions.
(1) When mounted on board (2) When not mounted on board
0 50 100 150
1200
800
0
Power dissia
p
tion
(
PD
)
[
mW
]
A
mbient tem
p
erature
(
Ta
)
[
°C
]
SOT-89-3
400
1000
200
600
SOT-23-5
6-pin SNB(B)
SOT-23-3
SOT-23-3
SOT-89-3
SOT-23-5
6-Pin SNB(B)
600
400
0
Power d issi
p
ation
(
P
D
)
[
mW
]
200
050 100 150
A
mbient temperature
(
Ta
)
[°C]
Figure 9 Power Dissipation of The Package
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0_00 S-8355/56/57/58 Series
Seiko Instruments Inc. 15
Electrical Characteristics
(1) 100 kHz Product (B, E and K Types)
Table 23 (1 / 2) (Ta = 25°C unless otherwise specified)
Item Symbol Condition Min. Typ. Max. Unit
Measurement
circuit
Output voltage V
OUT
−
V
OUT(S)
×
0.976 V
OUT(S)
V
OUT(S)
×
1.024 V 2
Input voltage V
IN
−
−
−
10 V 2
Operation start voltage V
ST1
I
OUT
= 1 mA
−
−
0.9 V 2
Oscillation start voltage V
ST2
No external pa rts, Voltage applied to V
OUT
−
−
0.8 V 1
Operation ho lding voltage V
HLD
I
OUT
= 1 mA, Judged by decreasing V
IN
voltage gradually 0.7
−
−
V 2
S-835xx15 to 19
−
14.0 23.4
μ
A 1
S-835xx20 to 29
−
19.7 32.9
μ
A 1
S-835xx30 to 39
−
25.9 43.2
μ
A 1
S-835xx40 to 49
−
32.6 54.4
μ
A 1
S-835xx50 to 59
−
39.8 66.4
μ
A 1
Current consumption 1 I
SS1
V
OUT
= V
OUT(S)
×
0.95
S-835xx60 to 65
−
47.3 78.9
μ
A 1
S-835xx15 to 19
−
5.6 11.1
μ
A 1
S-835xx20 to 29
−
5.8 11.5
μ
A 1
S-835xx30 to 39
−
5.9 11.8
μ
A 1
S-835xx40 to 49
−
6.1 12.1
μ
A 1
S-835xx50 to 59
−
6.3 12.5
μ
A 1
Current consumption 2 I
SS2
V
OUT
= V
OUT(S)
+
0.5 V
S-835xx60 to 65
−
6.4 12.8
μ
A 1
Current consumption du ring
shutdown
(With shutdown function) I
SSS
OFF/ON
V
= 0 V
−
−
0.5
μ
A 1
S-835xx15 to 19
−
4.5
−
8.9
−
mA 1
S-835xx20 to 24
−
6.2
−
12.3
−
mA 1
S-835xx25 to 29
−
7.8
−
15.7
−
mA 1
S-835xx30 to 39
−
10.3
−
20.7
−
mA 1
S-835xx40 to 49
−
13.3
−
26.7
−
mA 1
S-835xx50 to 59
−
16.1
−
32.3
−
mA 1
I
EXTH
V
EXT
= V
OUT
−
0.4 V
S-835xx60 to 65
−
18.9
−
37.7
−
mA 1
S-835xx15 to 19 9.5 19.0
−
mA 1
S-835xx20 to 24 12.6 25.2
−
mA 1
S-835xx25 to 29 15.5 31.0
−
mA 1
S-835xx30 to 39 19.2 38.5
−
mA 1
S-835xx40 to 49 23.8 47.6
−
mA 1
S-835xx50 to 59 27.4 54.8
−
mA 1
EXT pin output current
I
EXTL
V
EXT
= 0.4 V
S-835xx60 to 65 30.3 60.6
−
mA 1
Line regulation
Δ
V
OUT1
V
IN
= V
OUT(S)
×
0.4 to
×
0.6
−
30 60 mV 2
Load regulation
Δ
V
OUT2
I
OUT
= 10
μ
A to V
OUT(S)
/ 50
×
1.25
−
30 60 mV 2
Output voltage temperature
coefficient
OUT
OUT
VTaΔ
VΔ
•
Ta =
−
40 to
+
85
°
C
−
±
50
−
ppm /
°
C2
Oscillation frequency f
OSC
V
OUT
= V
OUT(S)
×
0.95 85 100 115 kHz 1
Maximum duty ratio MaxDuty V
OUT
= V
OUT(S)
×
0.95 75 83 90 % 1
PWM / PFM swit ching duty
ratio (For S-8356/58 Series) PFMDuty V
IN
= V
OUT(S)
−
0.1 V, No-load 10 15 24 % 1
V
SH
Measured oscillation at EXT pin 0.75
−
−
V 1
V
SL1
At V
OUT
≥
1.5 V
−
−
0.3 V 1
OFF/ON
pin input voltage
(With shutdown function) V
SL2
Judged oscillation stop at
EXT pin At V
OUT
<
1.5 V
−
−
0.2 V 1
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series Rev.7.0_00
Seiko Instruments Inc.
16
Table 23 (2 / 2) (Ta = 25°C unless otherwise specified)
Item Symbol Condition Min. Typ. Max. Unit
Measurement
circuit
I
SH
OFF/ON
V
= V
OUT(S)
×
0.95
−
0.1
−
0.1
μ
A 1
OFF/ON
pin input current
(For with shutdown function ) I
SL
OFF/ON
V
= 0 V
−
0.1
−
0.1
μ
A 1
Soft start time t
SS
−
3.0 6.0 12.0 ms 2
Efficiency EFFI
−
−
85
−
% 2
External parts
Coil: CDRH6D28-470 of Sumida Corporation
Diode: RB461F (Schottky type) of Rohm Co., Ltd.
Capacitor: F93 (16 V, 47 μF tantalum type) of Nichicon Corporation
Transistor: CPH3210 of Sanyo El ectric Co., Ltd.
Base resistor (Rb): 1.0 kΩ
Base capacitor (Cb): 2200 pF (ceramic type)
VIN = VOUT(S) × 0.6 applied, IOUT = VOUT(S) / 50 Ω
With shutdown function : OFF/ON pin is connected to VOUT
For VDD / VOUT separate type : VDD pin is connected to VOUT pin
Remark 1. VOUT(S) specified above is the set output voltage value, and VOUT is the typical value of the actual output voltage.
2. VDD / VOUT separate type
A step-up operation is performed from VDD = 0.8 V. However, 1.8 V ≤ VDD ≤ 10 V is recommended stabilizing
the output voltage and oscillation frequency. (VDD ≥ 1.8 V must be applied for products with a set value of less
than 1.9 V.)
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0_00 S-8355/56/57/58 Series
Seiko Instruments Inc. 17
(2) 250 kHz Product (H, J and L Types)
Table 24 (Ta = 25°C unless otherwise specified)
Item Symbol Condition Min. Typ. Max. Unit
Measurement
circuit
Output voltage V
OUT
−
V
OUT(S)
×
0.976 V
OUT(S)
V
OUT(S)
×
1.024 V 2
Input voltage V
IN
−
−
−
10 V 2
Operation start voltage V
ST1
I
OUT
= 1 mA
−
−
0.9 V 2
Oscillation start voltage V
ST2
No external pa rts, Voltage applied to V
OUT
−
−
0.8 V 1
Operation ho lding voltage V
HLD
I
OUT
= 1 mA, Judged by decreasing V
IN
voltage gradually 0.7
−
−
V 2
S-835xx15 to 19
−
28.9 48.2
μ
A 1
S-835xx20 to 29
−
42.7 71.1
μ
A 1
S-835xx30 to 39
−
58.0 96.7
μ
A 1
S-835xx40 to 49
−
74.5 124.1
μ
A 1
S-835xx50 to 59
−
92.0 153.4
μ
A 1
Current consumption 1 I
SS1
V
OUT
= V
OUT(S)
×
0.95
S-835xx60 to 65
−
110.5 184.2
μ
A 1
S-835xx15 to 19
−
8.7 17.3
μ
A 1
S-835xx20 to 29
−
8.8 17.6
μ
A 1
S-835xx30 to 39
−
9.0 18.0
μ
A 1
S-835xx40 to 49
−
9.2 18.3
μ
A 1
S-835xx50 to 59
−
9.3 18.6
μ
A 1
Current consumption 2 I
SS2
V
OUT
= V
OUT(S)
+
0.5 V
S-835xx60 to 65
−
9.5 19.0
μ
A 1
Current consumption du ring
shutdown
(With shutdown function) I
SSS
OFF/ON
V
= 0 V
−
−
0.5
μ
A 1
S-835xx15 to 19
−
4.5
−
8.9
−
mA 1
S-835xx20 to 24
−
6.2
−
12.3
−
mA 1
S-835xx25 to 29
−
7.8
−
15.7
−
mA 1
S-835xx30 to 39
−
10.3
−
20.7
−
mA 1
S-835xx40 to 49
−
13.3
−
26.7
−
mA 1
S-835xx50 to 59
−
16.1
−
32.3
−
mA 1
I
EXTH
V
EXT
= V
OUT
−
0.4 V
S-835xx60 to 65
−
18.9
−
37.7
−
mA 1
S-835xx15 to 19 9.5 19.0
−
mA 1
S-835xx20 to 24 12.6 25.2
−
mA 1
S-835xx25 to 29 15.5 31.0
−
mA 1
S-835xx30 to 39 19.2 38.5
−
mA 1
S-835xx40 to 49 23.8 47.6
−
mA 1
S-835xx50 to 59 27.4 54.8
−
mA 1
EXT pin output current
I
EXTL
V
EXT
= 0.4 V
S-835xx60 to 65 30.3 60.6
−
mA 1
Line regulation
Δ
V
OUT1
V
IN
= V
OUT(S)
×
0.4 to
×
0.6
−
30 60 mV 2
Load regulation
Δ
V
OUT2
I
OUT
= 10
μ
A to V
OUT(S)
/ 50
×
1.25
−
30 60 mV 2
Output voltage temperature
coefficient
OUT
OUT
VTaΔ
VΔ
•
Ta =
−
40 to
+
85
°
C
−
±
50
−
ppm /
°
C2
Oscillation frequency f
OSC
V
OUT
= V
OUT(S)
×
0.95 212.5 250 287.5 kHz 1
Maximum duty ratio MaxDuty V
OUT
= V
OUT(S)
×
0.95 70 78 85 % 1
PWM / PFM swit ching duty
ratio (For S-8356/58 Series) PFMDuty V
IN
= V
OUT(S)
−
0.1 V, No-load 10 15 24 % 1
V
SH
Measured oscillation at EXT pin 0.75
−
−
V 1
V
SL1
At V
OUT
≥
1.5 V
−
−
0.3 V 1
OFF/ON
pin input voltage
(With shutdown function) V
SL2
Judged oscillation stop at
EXT pin At V
OUT
<
1.5 V
−
−
0.2 V 1
I
SH
OFF/ON
V
= V
OUT(S)
×
0.95
−
0.1
−
0.1
μ
A 1
OFF/ON
pin input current
(With shutdown function) I
SL
OFF/ON
V
= 0 V
−
0.1
−
0.1
μ
A 1
Soft start time t
SS
−
1.5 3.0 6.0 ms 2
Efficiency EFFI
−
−
85
−
% 2
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series Rev.7.0_00
Seiko Instruments Inc.
18
External parts
Coil: CDRH6D28-220 of Sumida Corporation
Diode: RB461F (Schottky type) of Rohm Co., Ltd.
Capacitor: F93 (16 V, 47 μF tantalum type) of Nichicon Corporation
Transistor: CPH3210 of Sanyo Electric Co., Ltd.
Base resistor (Rb): 1.0 kΩ
Base capacitor (Cb): 2200 pF (ceramic type)
VIN = VOUT(S) × 0.6 applied, IOUT = VOUT(S) / 50 Ω
With shutdown function : OFF/ON pin is connected to VOUT
For VDD / VOUT separate type : VDD pin is connected to VOUT pin
Remark 1. VOUT(S) specified above is the set output voltage value, and VOUT is the t ypical value of the actual output voltage.
2. VDD / VOUT separate type
A step-up operation is performed from VDD = 0.8 V. However, 1.8 V ≤ VDD ≤ 10 V is recommended stabilizing
the output voltage and oscillation frequency. (VDD ≥ 1.8 V must be applied for products with a set value of less
than 1.9 V.)
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0_00 S-8355/56/57/58 Series
Seiko Instruments Inc. 19
(3) 300 kHz Product (F, G and M Types)
Table 25 (Ta = 25°C unless otherwise specified)
Item Symbol Condition Min. Typ. Max. Unit
Measurement
circuit
Output voltage V
OUT
−
V
OUT(S)
×
0.976 V
OUT(S)
V
OUT(S)
×
1.024 V 2
Input voltage V
IN
−
−
−
10 V 2
Operation start voltage V
ST1
I
OUT
= 1 mA
−
−
0.9 V 2
Oscillation start voltage V
ST2
No external pa rts, Voltage applied to V
OUT
−
−
0.8 V 1
Operation ho lding voltage V
HLD
I
OUT
= 1 mA, Judged by decreasing V
IN
voltage gradually 0.7
−
−
V 2
S-835xx15 to 19
−
33.8 56.4
μ
A 1
S-835xx20 to 29
−
50.3 83.9
μ
A 1
S-835xx30 to 39
−
68.6 114.4
μ
A 1
S-835xx40 to 49
−
88.4 147.4
μ
A 1
S-835xx50 to 59
−
109.4 182.4
μ
A 1
Current consumption 1 I
SS1
V
OUT
= V
OUT(S)
×
0.95
S-835xx60 to 65
−
131.6 219.3
μ
A 1
S-835xx15 to 19
−
9.7 19.4
μ
A 1
S-835xx20 to 29
−
9.9 19.7
μ
A 1
S-835xx30 to 39
−
10.0 20.0
μ
A 1
S-835xx40 to 49
−
10.2 20.4
μ
A 1
S-835xx50 to 59
−
10.4 20.7
μ
A 1
Current consumption 2 I
SS2
V
OUT
= V
OUT(S)
+
0.5 V
S-835xx60 to 65
−
10.5 21.0
μ
A 1
Current consumption du ring
shutdown
(With shutdown function) I
SSS
OFF/ON
V
= 0 V
−
−
0.5
μ
A 1
S-835xx15 to 19
−
4.5
−
8.9
−
mA 1
S-835xx20 to 24
−
6.2
−
12.3
−
mA 1
S-835xx25 to 29
−
7.8
−
15.7
−
mA 1
S-835xx30 to 39
−
10.3
−
20.7
−
mA 1
S-835xx40 to 49
−
13.3
−
26.7
−
mA 1
S-835xx50 to 59
−
16.1
−
32.3
−
mA 1
I
EXTH
V
EXT
= V
OUT
−
0.4 V
S-835xx60 to 65
−
18.9
−
37.7
−
mA 1
S-835xx15 to 19 9.5 19.0
−
mA 1
S-835xx20 to 24 12.6 25.2
−
mA 1
S-835xx25 to 29 15.5 31.0
−
mA 1
S-835xx30 to 39 19.2 38.5
−
mA 1
S-835xx40 to 49 23.8 47.6
−
mA 1
S-835xx50 to 59 27.4 54.8
−
mA 1
EXT pin output current
I
EXTL
V
EXT
= 0.4 V
S-835xx60 to 65 30.3 60.6
−
mA 1
Line regulation
Δ
V
OUT1
V
IN
= V
OUT(S)
×
0.4 to
×
0.6
−
30 60 mV 2
Load regulation
Δ
V
OUT2
I
OUT
= 10
μ
A to V
OUT(S)
/ 50
×
1.25
−
30 60 mV 2
Output voltage temperature
coefficient
OUT
OUT
VTaΔ
VΔ
•
Ta =
−
40 to
+
85
°
C
−
±
50
−
ppm /
°
C2
Oscillation frequency f
OSC
V
OUT
= V
OUT(S)
×
0.95 255 300 345 kHz 1
Maximum duty ratio MaxDuty V
OUT
= V
OUT(S)
×
0.95 70 78 85 % 1
PWM / PFM swit ching duty
ratio (For S-8356/58 Series) PFMDuty V
IN
= V
OUT(S)
−
0.1 V, No-load 10 15 24 % 1
V
SH
Measured oscillation at EXT pin 0.75
−
−
V 1
V
SL1
At V
OUT
≥
1.5 V
−
−
0.3 V 1
OFF/ON
pin input voltage
(With shutdown function) V
SL2
Judged oscillation stop at
EXT pin At V
OUT
<
1.5 V
−
−
0.2 V 1
I
SH
OFF/ON
V
= V
OUT(S)
×
0.95
−
0.1
−
0.1
μ
A 1
OFF/ON
pin input current
(With shutdown function) I
SL
OFF/ON
V
= 0 V
−
0.1
−
0.1
μ
A 1
Soft start time t
SS
−
1.5 3.0 6.0 ms 2
Efficiency EFFI
−
−
85
−
% 2
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series Rev.7.0_00
Seiko Instruments Inc.
20
External parts
Coil: CDRH6D28-220 of Sumida Corporation
Diode: RB461F (Schottky type) of Rohm Co., Ltd.
Capacitor: F93 (16 V, 47 μF tantalum type) of Nichicon Corporation
Transistor: CPH3210 of Sanyo Electric Co., Ltd.
Base resistor (Rb): 1.0 kΩ
Base capacitor (Cb): 2200 pF (cera m ic type)
VIN = VOUT(S) × 0.6 applied, IOUT = VOUT(S) / 50 Ω
With shutdown function : OFF/ON pin is connected to VOUT
For VDD / VOUT separate type : VDD pin is connected to VOUT pin
Remark 1. VOUT(S) specified above is the set output voltage value, and VOUT is the t ypical value of the actual output voltage.
2. VDD / VOUT separate type
A step-up operation is performed from VDD = 0.8 V. However, 1.8 V ≤ VDD ≤ 10 V is recommended stabilizing
the output voltage and oscillation frequency. (VDD ≥ 1.8 V must be applied for products with a set value of less
than 1.9 V.)
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0_00 S-8355/56/57/58 Series
Seiko Instruments Inc. 21
(4) 600 kHz Product (N Type) Table 26 (Ta = 25°C unless otherwise specified)
Item Symbol Condition Min. Typ. Max. Unit
Measurement
circuit
Output voltage V
OUT
−
V
OUT(S)
×
0.976 V
OUT(S)
V
OUT(S)
×
1.024 V 2
Input voltage V
IN
−
−
−
10 V 2
Operation start voltage V
ST1
I
OUT
= 1 mA
−
−
0.9 V 2
Oscillation start voltage V
ST2
No external pa rts, Voltage applied to V
OUT
−
−
0.8 V 1
Operation ho lding voltage V
HLD
I
OUT
= 1 mA, Judged by decreasing V
IN
voltage gradually 0.7
−
−
V 2
S-835xx15 to 19
−
63.6 105.9
μ
A 1
S-835xx20 to 29
−
96.4 160.6
μ
A 1
S-835xx30 to 39
−
132.8 221.3
μ
A 1
S-835xx40 to 49
−
172.2 286.9
μ
A 1
S-835xx50 to 59
−
214.0 356.7
μ
A 1
Current consumption 1 I
SS1
V
OUT
= V
OUT(S)
×
0.95
S-835xx60 to 65
−
240.2 400.3
μ
A 1
S-835xx15 to 19
−
15.9 31.8
μ
A 1
S-835xx20 to 29
−
16.1 32.1
μ
A 1
S-835xx30 to 39
−
16.2 32.4
μ
A 1
S-835xx40 to 49
−
16.4 32.8
μ
A 1
S-835xx50 to 59
−
16.6 33.1
μ
A 1
Current consumption 2 I
SS2
V
OUT
= V
OUT(S)
+
0.5 V
S-835xx60 to 65
−
16.7 33.3
μ
A 1
Current consumption du ring
shutdown I
SSS
OFF/ON
V
= 0 V
−
−
0.5
μ
A 1
S-835xx15 to 19
−
4.5
−
8.9
−
mA 1
S-835xx20 to 24
−
6.2
−
12.3
−
mA 1
S-835xx25 to 29
−
7.8
−
15.7
−
mA 1
S-835xx30 to 39
−
10.3
−
20.7
−
mA 1
S-835xx40 to 49
−
13.3
−
26.7
−
mA 1
S-835xx50 to 59
−
16.1
−
32.3
−
mA 1
I
EXTH
V
EXT
= V
OUT
−
0.4 V
S-835xx60 to 65
−
18.9
−
37.7
−
mA 1
S-835xx15 to 19 9.5 19.0
−
mA 1
S-835xx20 to 24 12.6 25.2
−
mA 1
S-835xx25 to 29 15.5 31.0
−
mA 1
S-835xx30 to 39 19.2 38.5
−
mA 1
S-835xx40 to 49 23.8 47.6
−
mA 1
S-835xx50 to 59 27.4 54.8
−
mA 1
EXT pin output current
I
EXTL
V
EXT
= 0.4 V
S-835xx60 to 65 30.3 60.6
−
mA 1
Line regulation
Δ
V
OUT1
V
IN
= V
OUT(S)
×
0.4 to
×
0.6
−
30 60 mV 2
Load regulation
Δ
V
OUT2
I
OUT
= 10
μ
A to V
OUT(S)
/ 50
×
1.25
−
30 60 mV 2
Output voltage temperature
coefficient
OUT
OUT
VTaΔ
VΔ
•
Ta =
−
40 to
+
85
°
C
−
±
50
−
ppm /
°
C2
Oscillation frequency f
OSC
V
OUT
= V
OUT(S)
×
0.95 510 600 690 kHz 1
Maximum duty ratio MaxDuty V
OUT
= V
OUT(S)
×
0.95 65 78 85 % 1
PWM / PFM swit ching duty
ratio (For S-8356/58 Series) PFMDuty V
IN
= V
OUT(S)
−
0.1 V, No-load 10 15 24 % 1
V
SH
Measured oscillation at EXT pin 0.75
−
−
V 1
V
SL1
At V
OUT
≥
1.5 V
−
−
0.3 V 1
OFF/ON
pin input voltage V
SL2
Judged oscillation stop at
EXT pin At V
OUT
<
1.5 V
−
−
0.2 V 1
I
SH
OFF/ON
V
= V
OUT(S)
×
0.95
−
0.1
−
0.1
μ
A 1
OFF/ON
pin input current I
SL
OFF/ON
V
= 0 V
−
0.1
−
0.1
μ
A 1
Soft start time t
SS
−
1.5 3.0 6.0 ms 2
Efficiency EFFI
−
−
85
−
% 2
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series Rev.7.0_00
Seiko Instruments Inc.
22
External parts
Coil: CDRH6D28-100 of Sumida Corporation
Diode: RB461F (Schottky type) of Rohm Co., Ltd.
Capacitor: F93 (16 V, 47 μF tantalum type) of Nichicon Corporation
Transistor: CPH3210 of Sanyo Electric Co., Ltd.
Base resistor (Rb): 1.0 kΩ
Base capacitor (Cb): 2200 pF (ceramic type)
VIN = VOUT(S) × 0.6 applied, IOUT = VOUT(S) / 50 Ω, OFF/ON = VOUT
Remark VOUT(S) specified above is the set output voltage value, and VOUT is the typical value of the actual output voltage.
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0_00 S-8355/56/57/58 Series
Seiko Instruments Inc. 23
(5) 600 kHz Product (P and Q types)
Table 27 (Ta = 25°C unless otherwise specified)
Item Symbol Condition Min. Typ. Max. Unit
Measurement
circuit
Output voltage V
OUT
−
V
OUT(S)
×
0.976 V
OUT(S)
V
OUT(S)
×
1.024 V 4
Input voltage V
IN
−
−
−
10 V 4
Operation start voltage V
ST1
I
OUT
= 1 mA
−
−
0.9 V 4
Oscillation start voltage V
ST2
No external pa rts, Voltage applied to V
DD
−
−
0.8 V 3
Operation ho lding voltage V
HLD
I
OUT
= 1 mA, Judged by decreasing V
IN
voltage gradually 0.7
−
−
V 4
Current consumption 1 I
SS1
V
DD
= 3.3 V
−
132.8 221.3
μ
A 3
Current consumption 2 I
SS2
V
DD
= 3.3 V
−
16.2 32.4
μ
A 3
Current consumption du ring
shutdown
(With shutdown function) I
SSS
OFF/ON
V
= 0 V
−
−
0.5
μ
A 3
EXT pin output current I
EXTH
V
DD
= 3.3 V
−
10.3
−
20.7
−
mA 3
I
EXTL
V
DD
= 3.3 V 19.2 38.5
−
mA 3
Line regulation
Δ
V
OUT1
V
IN
= V
OUT(S)
×
0.4 to
×
0.6
−
30 60 mV 4
Load regulation
Δ
V
OUT2
I
OUT
= 10
μ
A to V
OUT(S)
/ 50
×
1.25
−
30 60 mV 4
Output voltage temperature
coefficient
OUT
OUT
VTaV
•Δ
Δ
Ta =
−
40 to
+
85
°
C
−
±
50
−
ppm /
°
C4
Oscillation frequency f
OSC
V
DD
= 3.3 V 510 600 690 kHz 3
Maximum duty ratio MaxDuty V
DD
= 3.3 V 65 78 85 % 3
PWM / PFM swit ching duty
ratio (For S-8356/58 Series) PFMDuty V
IN
= V
OUT(S)
−
0.1 V, No-load 10 15 24 % 3
V
SH
Measured oscillation at EXT pin 0.75
−
−
V 3
V
SL1
At V
OUT
≥
1.5 V
−
−
0.3 V 3
OFF/ON
pin input voltage
(With shutdown function) V
SL2
Judged oscillation stop at
EXT pin At V
OUT
<
1.5 V
−
−
0.2 V 3
I
SH
OFF/ON
V
= V
OUT(S)
×
0.95
−
0.1
−
0.1
μ
A 3
OFF/ON
pin input current
(With shutdown function) I
SL
OFF/ON
V
= 0 V
−
0.1
−
0.1
μ
A 3
Soft start time t
SS
−
1.5 3.0 6.0 ms 4
Efficiency EFFI
−
−
85
−
% 4
External parts
Coil: CDRH6D28-100 of Sumida Corporation
Diode: RB461F (Schottky type) of Rohm Co., Ltd.
Capacitor: F93 (16 V, 47 μF tantalum type) of Nichicon Corporation
Transistor: CPH3210 of Sanyo Elect r ic Co., Ltd.
Base resistor (Rb): 1.0 kΩ
Base capacitor (Cb): 2200 pF (ceramic type)
VIN = VOUT(S) × 0.6 applied, IOUT = VOUT(S) / 50 Ω, OFF/ON = VOUT
Remark 1. VOUT(S) specified above is the set output voltage value, and VOUT is the typical val ue of the actual out put voltage.
2. VDD / VOUT separate type
A step-up operation is perfor med from V DD = 0.8 V. However, 1. 8 V ≤ VDD ≤ 10 V is recommended stab ilizing
the output voltage and oscillation frequency. (VDD ≥ 1.8 V must be applied for products with a set value of
less than 1.9 V.)
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series Rev.7.0_00
Seiko Instruments Inc.
24
Measurement Circuits
1.
Oscilloscope
A
+
−
VSS
EXT
VOUT
VDD
*2
0.1 μF
OFF/ON
*1
Figure 10
2.
V
CD
Rb
VSS
EXT VOUT
VDD*2
0.1 μF
OFF/ON
*1
+
−
+
−
Figure 11
3.
Oscilloscope
VSS
EXT VOUT
VDD 0.1 μF
A
OFF/ON
*1
+
−
Figure 12
4.
V
C
D
R
b
VSS
EXT VOUT
VDD
0.1 μF
OFF/ON
*1
+
−
+
−
Figure 13
*1. With shutdown function
*2. For VDD / VOUT separate type
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0_00 S-8355/56/57/58 Series
Seiko Instruments Inc. 25
Operation
1. Switching Control Type s
1.1 PWM Control (S-8355/57 Series)
The S-8355/57 Series is a DC-DC converter using a pulse width modulation method (PWM) and features a low
current consumption.
In conventional PFM DC-DC converters, pulses are skipped when the output load current is low, causing a
fluctuation in the ripple frequency of the output voltage, resulting in an increase in the ripple voltage.
The switching frequency does not change, although the pulse width changes from 0 to 83% (78% for F, G, H, J, L,
M, N, P and Q types) corresponding to eac h load current. The ripple voltage gen erated from switching can thus
be removed easily through a filter because the switching frequency is constant.
1.2 PWM/PFM Switching Control (S-8356/58 Serie s)
S-8356/58 Series is a DC-DC converter that automatically switches between a pulse width modulation method
(PWM) and a pulse frequency modu lation method (PFM), dependin g on the load curr ent, and features lo w current
consumption.
The S-8356/58 Series oper ate s under PW M control with the pulse width du t y changing from 15 to 83 % (7 8% for F,
G, H, J, L, M, N, P and Q types) in a high output load current area.
The S-8356/58 Series operate s under PFM control with the pulse width duty fixed at 15%, and puls es are skipped
according to the load current. The oscillation circuit thus oscillates intermittently so that the resultant lower self
current consumption prevents a reduction in the efficiency at a low load current. The switching point from PWM
control to PFM control depends on the e xternal devices (coil, diode, etc.), input voltage a nd output voltage. This
series are an especially highly efficient DC-DC converter at an output current around 100 μA.
2. Soft Start Function
For this IC, the built-in soft start circuit controls the rush current and overshoot of the output voltage when
powering on or when the OFF/ON pin is switched to the “H” level.
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series Rev.7.0_00
Seiko Instruments Inc.
26
3. OFFON/ Pin (Shutdown Pin) (SOT-23-5 Package Products of S-8355/56/57/58 Series B, H, F, K, L, M, N and Q
Types, and 6-Pin SNB(B) Package Products)
OFF/ON pin stops or starts step-up operation.
Setting the OFF/ON pin to the “L” level stops operation of all the internal circuits and reduces the current
consumption significantl y.
DO NOT use the OFF/ON pin in a floating state because it has the structure sho wn in Figure 14 and is not pulled
up or pulled down internally. DO NOT apply a voltage of between 0.3 V and 0.75 V to the OFF/ON pin because
applying such a voltage increases the current consumption. If the OFF/ON pin is not used, connect it to the VOUT
pin.
The OFF/ON pin does not have h ysteresis.
Table 28
OFF/ON pin CR oscillation circuit Output voltage
“H” Operation Fixed
“L” Stop
≅VIN*1
*1. Voltage obtained by subtracting the voltage drop due to the DC resistance of the inductor and the diode forward
voltage from VIN.
VSS
VOUT
*1
OFF/ON
*1. VDD for K, L, M and Q types.
Figure 14 OFFON/ Pin Structure
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0_00 S-8355/56/57/58 Series
Seiko Instruments Inc. 27
4. Operation
The following are the basic equations [(1) through (7)] of the step-up switching regulator. (Refer to Figure 15.)
C
L
M1
D
VOUT
CONT
VIN L
+
EXT
VSS −
Figure 15 Step-Up Switching Regulator Circuit for Basic Equation
Voltage at CONT pin at the moment M1 is turned ON (VA) *1 :
VA = VS *2 (1)
*1. Current flowing through L (IL) is zero.
*2. Non-saturated voltage of M1.
The change in IL over time :
LVV
L
V
dt
dI SINLL −
== (2)
Integration of equation (2) (IL) :
t
LVV
ISIN
L•
⎟
⎠
⎞
⎜
⎝
⎛−
= (3)
IL flows while M1 is ON (tON). The time of tON is determined by the oscill ation frequency of OSC.
The peak current (IPK) after tON :
ON
SIN
PK t
LVV
I•
⎟
⎠
⎞
⎜
⎝
⎛−
= (4)
The energy stored in L is represented b y 1/2 • L (IPK)2.
When M1 is turned OFF (tOFF), the energy stored in L is emitted through a diode to the output capacitor.
Then, the reverse voltage (VL) is generated :
VL = (VOUT + VD*1) − VIN (5)
*1. Diode forward voltage
The voltage at CONT pin rises only by VOUT+VD.
The change in the current (IL) flowing through the diode into VOUT during tOFF :
LVVV
L
V
dt
dI INDOUTLL −+
== (6)
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series Rev.7.0_00
Seiko Instruments Inc.
28
Integration of the equation (6) is as follows :
t
LVVV
II INDOUT
PKL •
⎟
⎠
⎞
⎜
⎝
⎛−+
−= (7)
During tON, the energy is store d in L and is not transmitt ed to VOUT. When receiving the output current (IOUT) from VOUT,
the energy of the cap acit or (CL) is consumed. As a result, the pi n voltage of CL is reduce d, and goes to the lowest level
after M1 is turned ON (tON). When M1 is turned OFF, the energy stored in L is tr ansmitted through the diode to CL, and
the voltage of CL rises rapidly. VOUT is a time function, and therefore indicates the maximum valu e (ripple voltage (VP−P) )
when the current flowing through into VOUT and load current (IOUT) ma tch.
Next, the ripple voltage is determined as follows.
IOUT vs. t1 (time) from when M1 is turned OFF (after tON) to when VOUT reaches the maximum level :
1
INDOUT
PKOUT t
LVVV
II •
⎟
⎠
⎞
⎜
⎝
⎛−+
−= (8)
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
−+
•−=∴
INDOUT
OUTPK1 VVV L
)II(t (9)
When M1 is tu rne d OF F ( tOFF), IL = 0 (w hen the ene rgy of the inductor is comple tely tran smitted ). Based on equation (7) :
PK
OFF
INDOUT I
t
VVV L=
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
−+ (10)
When substituting equ ation (10) for equation (9) :
OFF
PK
OUT
OFF1 t
I
I
tt •
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
−= (11)
Electric charge ΔQ1 which is charged in CL during t1 :
2
1
INDOUT
1PK
1t
0
INDOUT
1t
0
PKL
1t
0
1t
2
1
LVVV
tItdt
LVVV
dtIdtIQ •
−+
−•=•
−+
−•==Δ ∫∫∫ (12)
When substituting equation (12) for equation (9) :
()
1
OUTPK
1OUTPKPK t
2II
tII
2
1
I1Q •
+
=•−−=Δ (13)
A rise in voltage (VP−P) due to ΔQ 1 :
1
OUTPK
LL
1
PP t
2II
C
1
C
QΔ
V•
⎟
⎠
⎞
⎜
⎝
⎛+
•==
− (14)
When taking into consideration IOUT to be consumed during t1 and the Equivalent Series Resistance (RESR) of CL :
L
1OUT
ESR
OUTPKOUTPK
LL
1
PP CtI
R
2II
1t
2II
C
1
C
Q
V•
−•
⎟
⎠
⎞
⎜
⎝
⎛+
+•
⎟
⎠
⎞
⎜
⎝
⎛+
•=
Δ
=
− (15)
When substituting e quation (11) for equation (15) :
ESR
OUTPK
L
OFF
PK
2
OUTPK
PP R
2II
C
t
I2 )II(
V•
⎟
⎠
⎞
⎜
⎝
⎛+
+•
−
=
− (16)
Therefore to reduce the ripple voltage, it is i m portant that the capacitor connected to the output pin has a large capacity
and a small RESR.
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External Parts Selection
The relationship between the major characteristics of the step-up circuit and the characteristics parameters of the
external parts are shown in Fi gure 16.
For higher efficiency ?
For larger output current ? Operation
efficiency Stand-by
efficiency
For smaller ripple voltage ?
Smaller inductance
Larger inductance
Smaller direct current resistance of inductor
Larger output capacitance
Larger output capacitance
With MOS FET,
smaller ON resistance
With MOS FET,
smaller input capacitance
With bipolar transistor,
smaller exte rnal resistance R
b
With bipolar transistor, larger
external resistance R
b
Figure 16 Relationship between Major Characteristics of Step-up Circuit and External Parts
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
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1. Inductor
The inductance value (L value) has a strong influence on the maximum output current (IOUT) and efficiency (η).
Figure 17 shows the relationship between the IOUT and η dependency on L of S-8355/56/57/58 series.
F, G, H, J, L and M types
CDRH6D28, V
OUT
= 5.0 V, V
IN
= 3.0 V
Recommended range
I
OUT
η
4.7 47
L value (μH)
Efficiency
decreases
I
OUT
decreases
I
PK
increases
Coil size :
smal ler
Efficiency
decreases
I
OUT
decreases
I
PK
decreases
Coil size : bigger
Figure 17 L Value vs. IOUT Characteristics, L Valu e vs. η Characteristics
The peak current (IPK) increases by decreasing L value and the stabilit y of the circuit improves and I OUT increases. If L
value is decreased, the efficiency falls causing a decli ne in the current drive capacity for the switching transistor, and
IOUT decreases.
The loss of IPK by the switching transistor decreases by incr easing L value and the efficie ncy becomes maximum at a
certain L value. Further increasing L value decreases the efficiency due to the loss of the direct current resistance of
the coil. IOUT also decreases.
A higher oscillation frequ ency allows selectio n of a lower L value, making the coil smaller.
The recommended inductances are a 22 to 100 μH for B, E, and K types, a 4.7 to 47 μH for F, G, H, J, L, and M
types, 3.0 to 22 μH for N, P and Q types.
Be careful of the allowable inductor current when choosing an inductor. Exceeding the allowable current of the
inductor causes magnetic saturation, much l ower efficiency and destruction of the IC chip due to a large current.
Choose an inductor so that IPK does not exceed the allo wable current. IPK in discontinuous mode is calculated by the
following equation:
Lf )VVV(I 2
IOSC
INDOUT
OUT
PK •
−+
= (A) (17)
fosc = oscillation frequency, VD ≅ 0.4 V.
2. Diode
Use an external diode t hat meets the following requirements :
• Low forward volt age : VF < 0.3 V
• High switching speed : 500 ns max.
• Reverse voltage : VOUT + VF or more
• Current rate : IPK or more
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3. Capacitor (CIN, CL)
A capacitor on the input side (CIN) improves the efficiency by reducing t he power impedance and stabilizing the input
current. Select a CIN value according to the impedance of the power supply used.
A capacitor on the output side (CL) is used for smoothing the output voltage. For step-up types, the output voltage
flows intermittently to the load current, so step-up t ypes need a larger capacitance than step-do wn types. Therefore,
select an appropriate capacitor in accordance with the ripple voltage, which increases in case of a higher output
voltage or a higher load curre nt. The capacitor value should be 10 μF or more.
Select an appropriate capacit or the equivalent series resistance (RESR) for stable output voltag e. The stable voltage
range in this IC depends on the RESR. Although the inductance value (L valu e) is also a factor, an RESR of 30 to 500
mΩ maximizes the characteristics. However, the best RESR value may depend on the L value, the capacitance, the
wiring, and the applications (output load). Therefor e, fully evaluate the RESR under the actual operating conditions to
determine the best value.
Refer to the “3. Example of Ceramic Capacitor Application” (Figure 27) in the “ Application Circuit” for the
circuit example using a ceramic capacitor a nd the external resistance of the capacitor (RESR).
4. External Transistor
An enhancement (N-channel) MOS F ET type or A bipolar (NPN) type can be used as the externa l transistor.
4.1 Enhancement (N-channel) MOS FET Type
Figure 18 is a circuit example using a MOS FET transistor (N-channel).
V
OUT
EXT
VOUT
+
−
OFF/ON
*2
VSS
VDD
*1
+
−
*1. For VDD / VOUT separate type.
*2. With shutdown function.
Figure 18 Circuit Example Using MOS FET (N-channel) Type
An N-channel power MOS FET should be used for the MOS FET. Because the gate voltage and current of the
external power MOS FET are supplied from the stepped-up output voltage (VOUT), the MOS FET is driven more
effectively.
A large current may flow during startup, depending on the MOS FET selection. So perform sufficient evaluation
using the actual devices. Also recommend to use a MOS FET with an input capacitance of 700 pF or less.
Since the ON-resistance of the MOS FET might depend on the difference between the output voltag e (VOUT) and
the threshold voltage of the MOS FET, and affect the output current as well as the efficiency, the threshold
voltage should be low. When the output voltage is low, the circuit operates only when the MOS FET has a
threshold voltage lower than the output voltage.
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4.2 Bipolar (NPN) Type
A circuit example using the CPH3210 (hFE = 200 to 560) from Sanyo Electric Co., Ltd. As a bipolar transistor
(NPN) is shown in Figure 20 to 25 in the “ Standard Circuits”. The hFE value and Rb value of the bipolar
transistor determine the driving capacity to increase the output current using a bipolar transistor. A peripheral
circuit example of the transistor is shown in Figure 19.
Nch
Pch
VOUT
*1
I
PK
EXT
C
b
2200 pF
R
b
1 kΩ
*1. VDD for E, G, J, K, L, M, P and Q types.
Figure 19 External Transistor Peripheral Circuit
The recommended Rb value is around 1 kΩ. Actually, calculate the necessary base current (Ib) from the bipolar
transistor (hFE) using FE
PK
bh
I
I=, and select the smaller Rb value than EXTHb
OUT
bI 4.0
I7.0V
R−
−
= *1.
A small Rb value can increase the output current, but the efficiency decreases. Since a current may flow on the
pulse and the voltage may drop due to wiring resistance or other factors in the actual circuit, therefore the
optimum Rb value should be determined by experiment.
Connecting the speed-up capacitor (Cb) in parallel with the Rb resistance as shown in Figure 19, decreases
switching loss and improves the efficiency.
The Cb value is calculated according to 7.0fRπ21
Coscb
b•••
≤.
Select a Cb value after performing sufficient evaluation since the optimum Cb value differs depending upon the
characteristics of the bip olar t ransistor.
*1. For E, G, J, K, L, M, P and Q type, EXTHb
DD
bI 4.0
I7.0V
R−
−
=.
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5. VDD / VOUT Separate Type (For E, G, J, K, L, M, P and Q Types)
The E, G, J, K, L, M, P and Q types provides separate internal circuit power supply (VDD pin) and output voltage
setting pin (VOUT pin) in the IC, making it ideal for the following applications.
(1) When changing the output voltage with external resistance.
(2) When outputting a high voltage such as +15 V or +20 V.
Choose the products in the Table 29 according to the applications (1) or (2) above.
Table 29
Output Voltage (VCC) 1.8 V ≤ VCC < 5 V 5 V ≤ VCC Reference Circuit
S-835xx18 Yes Yes
Application circuit 1 (Figure 26)
S-835xx50 − Yes
Application circuit 1 (Figure 26)
Connection to VDD pin VIN or VCC V
IN −
Cautions 1. This IC starts a step-up operation at VDD = 0.8 V, but set 1.8 ≤ VDD ≤ 10 V to stabilize the outpu t
voltage and frequency of the oscillator. (Input a voltage of 1.8 V or more at the VDD pin for all
products with a setting less than 1.9 V.) An input voltage of 1.8 V or more at the VDD pin allows
connection of the VDD pin to either the input voltage VIN pin or output VOUT pin.
2. Choose external resistors RA and RB so as to not affect the outpu t voltage, consid ering that there
is impedance between the VOUT pin and VSS pin in the IC chip. The internal resistance between
the VOUT pin and VSS pin is as follows :
(1) S-835xx18 : 2.1 to 14.8 MΩ
(2) S-835xx20 : 1.4 to 14.8 MΩ
(3) S-835xx30 : 1.4 to 14.2 MΩ
(4) S-835xx50 : 1.4 to 12.1 MΩ
3. Attach a capacitor (CC) in parallel to the RA resistance when an u nstable event such as
oscillation of the output voltage occurs. Calculate CC using the following equation :
[]
kHz 20R2 1
CA
C•••
=π
F
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Standard Circuits
（1） S-8357BxxMA, S-8357BxxUA, S-8358BxxMA , S-8358BxxUA
VOUT
EXT
VSS
PWM control circuit or
PWM / PFM switch ing
cont rol c ircui t
Phase
compensating
circuit
Oscillation
circuit
Soft start bu ilt-in
reference power
supply
+
−
VIN 1 KΩ
2200
p
F
CIN
SD
CL
+
− +
−
IC
internal
power
supply
Remark The power supply for the IC chip is from the VOUT pin.
Figure 20
（2） S-8357BxxMC, S-8357FxxMC / BD, S-8357HxxMC / BD, S-83 57Nxx MC / BD,
S-8358BxxMC, S-8358FxxMC / BD , S-8358HxxMC / BD, S-8358N xxMC / BD
VOUT
V
IN
L
2200
p
F
C
IN
SD
C
L
+
− +
−
VSS
+
−
OFF/ON
EXT
Oscillation
circuit
PWM control circuit or
PWM / PFM switch ing
cont rol c ircui t
Soft start bu ilt-in
reference power
supply
IC
internal
power
supply
Phase
compensating
circuit
1 KΩ
Remark The power supply for the IC chip is from the VOUT pin.
Figure 21
（3） S-8357ExxMC, S-8357GxxMC / BD, S-8357Jxx MC / BD, S-8357 PxxMC / BD ,
S-8358ExxMC, S-8358GxxMC / BD , S-8358JxxMC / BD, S-8358 PxxMC / BD
VOUT
EXT
VSS
V
IN
L
2200
p
F
C
IN
SD
+
−
Oscillation
circuit
PWM control circuit or
PWM / PFM switching
cont rol c ircui t
Soft start bu ilt-in
reference power
supply
VDD
+
−
Phase
compensating
circui
t
C
C
C
L
+
−
R
A
R
B
IC
internal
power
supply
1 KΩ
Remark The power supply for the IC chip is from the VDD pin.
Figure 22
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（4） S-8357 ExxMC , S-8357GxxMC / BD , S-8357JxxMC / BD,
S-8358ExxMC, S-8358GxxMC / BD, S-8358JxxMC / BD
VOUT
EXT
VSS
VIN
L
2200
p
F
CIN
SD
CL
+
− +
−
Oscillation
circuit
PWM control circuit or
PWM / PFM switch ing
cont rol c ircui t
Soft start bu ilt-in
reference power
supply
VDD
+
−
Phase
compensating
circuit
IC
internal
power
supply
1 KΩ
Remark The power supply for the IC chip is from the VDD pin.
Figure 23
（5） S-8355KxxMC / BD, S-8355LxxMC / BD, S-835 5MxxMC / BD, S-8355 QxxMC / BD,
S-8356KxxMC / BD, S-8356LxxMC / BD , S-835 6MxxMC / BD, S-8356 QxxMC / BD
VOUT
EXT
VSS
V
IN
L
2200
p
F
C
IN
SD
+
− C
L
+
−
VDD
C
C
R
A
R
B
OFF/ON
Oscillation
circuit
PWM control circuit or
PWM / PFM switch ing
cont rol c ircui t
+
−
Soft start built-in
reference power
supply
Phase
compensating
circuit
IC
internal
power
supply
1 KΩ
Remark The power supply for the IC chip is from the VDD pin.
Figure 24
（6） S-8355KxxMC / BD, S-8355LxxMC / BD, S-835 5MxxMC / BD,
S-8356KxxMC / BD, S-8356LxxMC / BD , S-835 6MxxMC / BD
VOUT
V
IN
L
2200
p
F
C
IN
SD
C
L
+
− +
−
VSS
EXT
VDD
OFF/ON
Oscillation
circuit
PWM control circuit or
PWM / PFM switch ing
cont rol c ircui t
+
−
Soft start bu ilt-in
reference power
supply
Phase
compensating
circuit
IC
internal
power
supply
1 KΩ
Remark The power supply for the IC chip is from the VDD pin.
Figure 25
Caution The above connection diagram and constant will not guarantee successful operation. Perform
through evaluation using the actual application to set the constant.
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Precautions
• Mount external capacitors, the diode, and the coil as close as possible to the IC.
• Characteristics ripple voltag e and spike noise occur in IC contai ning switching regulators. Moreover rush current flows
at the time of a power supply injection. Because these largely depend on the coil, the capacitor and impedance of
power supply used, fully chec k them using an actually mounted model.
• Make sure that the dissipation of the switching transistor (especially at a high temperature) does not exceed the
allowable power dissipation of the package.
• The performance of this IC varies depending on the design of the PCB patterns, peripheral circuits an d external parts.
Thoroughly test all settings with your device. Also, try to use the recommended external parts. If not, contact an SII
sales person.
• Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in electrostatic
protection circuit.
• SII claims no responsibilit y for any disputes arising out of or in connection with any infring ement by products including
this IC of patents owned by a third party.
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
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Application Circuits
1. LCD Power Supply
The following example is an application power supply circuit (15 V / 20 V output) to drive an LCD panel, and its
characteristics.
S-8356M50,
S-8356Q50
EXT
VOUT
VSS
VDD
V
OUT
C
L
C
C
R
B
R
A
TR
C
IN
V
IN
−
+
−
+
OFF/ON
L SD
Figure 26 Power Supply Circuit Example for LCD
Table 30
Condition Output Voltage IC L Type Name TR Type Name SD Type Name C
L
R
a
R
b
Cc
1 15 V S-8356M50 CDRH5D18-220 MCH3405 MA2Z748
F93
(20 V, 10
μ
F) 580 k
Ω
300 k
Ω
15 pF
2 20 V S-8356M50 CDRH5D18-220 FDN337N MA729 F93
(25 V, 10
μ
F) 575 k
Ω
200 k
Ω
15 pF
3 10 V S-8356Q50 CDRH5D18-100 MCH3405 MA2Z748
F93
(20 V, 10
μ
F) 560 k
Ω
560 k
Ω
15 pF
Caution The above connection diagram and constant will not guarantee successful operation. Perform through
evaluation using the actual application to set the constant.
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2. Output Characteristics of The Power Supply for LCD
The data of the step-up characteristics (a) Output current (IOUT) vs. Efficiency (η) characteristics, (b) Output current
(IOUT) vs. Output voltage (VOUT) characteristics under conditions of 1 to 3 in Table 30 is shown below.
Condition 1
(a) Output current (IOUT) vs. Efficiency (η) (b) Output current (IOUT) vs. Output volta ge (VOUT)
0
20
40
60
80
100
0.01 0.1 1 10 100
η [%]
I
OUT
[mA]
V
IN
= 3.0 V
V
IN
= 5.0 V
V
IN
= 7.0 V
12
13
14
15
16
V
OUT
[V]
0.01 0.1 1 10 100
I
OUT
[mA]
V
IN
= 3.0 V
V
IN
= 5.0 V
V
IN
= 7.0 V
Condition 2
(a) Output current (IOUT) vs. Efficiency (η) (b) Output current (IOUT) vs. Output volta ge (VOUT)
0
20
40
60
80
100
η [%]
0.01 0.1 1 10 100
I
OUT
[mA]
V
IN
= 3.0 V
V
IN
= 5.0 V
V
IN
= 7.0 V
14
16
18
20
22
V
OUT
[V]
0.01 0.1 1 10 100
I
OUT
[mA]
V
IN
= 3.0 V
V
IN
= 5.0 V
V
IN
= 7.0 V
Condition 3
(a) Output current (IOUT) vs. Efficiency (η) (b) Output current (IOUT) vs. Output voltage (VOUT)
0
20
40
60
80
100
η [%]
0.01 0.1 1 10 100
I
OUT
[mA]
V
IN
= 3.3 V
V
IN
= 5.0 V
7
8
9
10
11
V
OUT
[V]
0.01 0.1 1 10 100
I
OUT
[mA]
V
IN
= 3.3 V
V
IN
= 5.0 V
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3. Using Ceramic Capacitor Example
When using small RESR parts such as ceramic capacitors for the output capacitance, mount a resistor (R1)
corresponding to the RESR in series with the ceramic capacitor (CL) as shown in Figure 27.
R1 differs depending on “L” value, the capacitance, the wiring, and the application (output load).
The following example shows a circuit using R1 = 100 mΩ, output voltage = 3.3 V, output load = 500 mA and its
characteristics.
EXT VOUT
VSS
V
OUT
SD
C
L
L
R
1
TR
V
IN
C
IN
Figure 27 Using Ceramic C ap acitor Circuit Example
Table 31
Condition IC L Type Name TR Type Name SD Type Name SD Type Name R
1
1 S-8357F33 CDRH6D28-220 FDN335N M1FH3 10
μ
F
×
2 100 m
Ω
2 S-8358B50 CDRH6D28-470 FDN335N M1FH3 10
μ
F
×
2 100 m
Ω
3 S-8357N33 CDRH6D28-100 FDN335N M1FH3 10
μ
F
×
2 100 m
Ω
Caution The above connection diagram and constant will not guarantee successful operation. Perform through
evaluation using the actual application to set the constant.
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4. Output Characteristics of Th e Usin g Ceramic Capacitor Circuit Example
The data of the step-up characteristics (a) Output current (IOUT) vs. Efficiency (η) characteristics, (b) Output current
(IOUT) vs. Output voltage (VOUT) characteristics, (c) Output Current (IOUT) vs. Ripple voltage (Vr) und er conditions of 1
to 3 in Table 31 is shown below.
Condition 1
(a) Output current (IOUT) vs. Efficiency (η) (b) Output current (IOUT) vs. Output voltage (VOUT)
0
20
40
60
80
100
η [%]
0.01 0.1 1 10 100
I
OUT
[mA] 1000
V
IN
= 0.9 V
V
IN
= 1.8 V
V
IN
= 2.7 V
3.28
3.29
3.30
3.31
3.32
V
OUT
[V]
0.01 0.1 1 10 100
I
OUT
[mA] 1000
V
IN
= 0.9 V
V
IN
= 1.8 V
V
IN
= 2.7 V
(c) Output Current (IOUT) vs. Ripple voltage (Vr)
0
20
40
60
80
100
Vr [mV]
0.01 0.1 1 10 100
I
OUT
[mA] 1000
V
IN
= 0.9 V
V
IN
= 1.8 V
V
IN
= 2.7 V
Condition 2
(a) Output current (IOUT) vs. Efficiency (η) (b) Output current (IOUT) vs. Output voltage (VOUT)
0
20
40
60
80
100
η [%]
0.01 0.1 1 10 100
I
OUT
[mA] 1000
V
IN
= 2.0 V
V
IN
= 3.0 V
V
IN
= 4.0 V
5.03
5.04
5.05
5.06
5.07
V
OUT
[V]
0.01 0.1 1 10 100
I
OUT
[mA] 1000
V
IN
= 2.0 V
V
IN
= 3.0 V
V
IN
= 4.0 V
(c) Output Current (IOUT) vs. Ripple voltage (Vr)
0
20
40
60
80
100
V
r
[mV]
0.01 0.1 1 10 100
I
OUT
[mA] 1000
V
IN
= 2.0 V
V
IN
= 3.0 V
V
IN
= 4.0 V
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0_00 S-8355/56/57/58 Series
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Condition 3
(a) Output current (IOUT) vs. Efficiency (η) (b) Output current (IOUT) vs. Output voltage (VOUT)
0
20
40
60
80
100
η [%]
0.01 0.1 1 10 100
I
OUT
[mA] 1000
V
IN
= 0.9 V
V
IN
= 1.8 V
V
IN
= 2.7 V
3.28
3.29
3.30
3.31
3.32
V
OUT
[V]
0.01 0.1 1 10 100
I
OUT
[mA] 1000
V
IN
= 0.9 V
V
IN
= 1.8 V
V
IN
= 2.7 V
(c) Output Current (IOUT) vs. Ripple voltage (Vr)
0
20
40
60
80
100
Vr [mV]
0.01 0.1 1 10 100
I
OUT
[mA] 1000
V
IN
= 0.9 V
V
IN
= 1.8 V
V
IN
= 2.7 V
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series Rev.7.0_00
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Characteristics (Typical Data)
1. Example of Major Temperature characteristics (T a = −40 to +85 °C)
(1) C urrent Consump tion 1 (I
SS1
) vs. Temperature (Ta) (V
OUT
= 3.3 V)
fOSC = 100 kHz fOSC = 300 kHz
0
10
20
30
40
50
−40 −20 0 20 40 60 80 100
Ta [°C]
I
SS1
[μA]
0
10
20
30
40
50
−
40
−
20 0 20 40 60 80 100
Ta [°C]
I
SS1
[μA]
fOSC = 600 kHz
0
20
40
60
80
100
−40 −20 0 20 40 60 80 100
Ta [°C]
I
SS1
[μA]
(2) C urrent Consump tion 2 (I
SS2
) vs. Temperature (Ta) (V
OUT
= 3.3 V)
fOSC = 100 kHz fOSC = 300 kHz
0
2
4
6
8
10
−40 −20 0 20 40 60 80 100
Ta [°C]
I
SS2
[μA]
0
2
4
6
8
10
−
40
−
20 0 20 40 60 80 100
Ta [°C]
I
SS2
[μA]
fOSC = 600 kHz
0
2
4
6
8
10
−40 −20 0 20 40 60 80 100
Ta [°C]
I
SS2
[μA]
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0_00 S-8355/56/57/58 Series
Seiko Instruments Inc. 43
(3) C urrent C onsumptio n at Shu tdown (I
SSS
) vs. Temperature (Ta)
fOSC = 100 kHz fOSC = 300 kHz
0
0.2
0.4
0.6
0.8
1.0
−40 −20 0 20 40 60 80 100
Ta [°C]
I
SSS
[μA]
0
0.2
0.4
0.6
0.8
1.0
−
40
−
20 0 20 40 60 80 100
Ta [°C]
I
SSS
[μA]
(4) EXT Pin Output Current “H” (I
EXTH
) vs. Temperature (Ta) (5) EXT Pin Output Current “L” (I
EXTL
) vs. Temperature (Ta)
VOUT = 3.3 V, fOSC = 100 kHz VOUT = 3.3 V, fOSC = 300 kHz
−10
−20
−30
−40
−50
−60
−40 −20 0 20 40 60 80 100
Ta [°C]
I
EXTH
[mA]
0
0
10
20
30
40
50
60
−
40
−
20 0 20 40 60 80 100
Ta [°C]
I
EXTL
[mA]
(6) Oscillation Frequency (f
OSC
) vs. Tempera ture (Ta ) (V
OUT
= 3.3 V)
fOSC = 100 kHz fOSC = 300 kHz
50
75
100
125
150
−40 −20 0 20 40 60 80 100
Ta [°C]
f
OSC
[kHz]
200
250
300
350
400
−
40
−
20 0 20 40 60 80 100
Ta [°C]
f
OSC
[kHz]
fOSC = 600 kHz
400
500
600
700
800
−40 −20 0 20 40 60 80 100
Ta [°C]
f
OSC
[kHz]
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series Rev.7.0_00
Seiko Instruments Inc.
44
(7) Maximum Duty Ratio (MaxDuty) vs. Temperature (Ta) (V
OUT
= 3.3 V)
fOSC = 100 kHz fOSC = 300 kHz
70
75
80
85
90
−40 −20 0 20 40 60 80 100
Ta [°C]
MaxDuty [%]
70
75
80
85
90
−
40
−
20 0 20 40 60 80 100
Ta [°C]
MaxDuty [%]
fOSC = 600 kHz
70
75
80
85
90
−40 −20 0 20 40 60 80 100
Ta [°C]
MaxDuty [%]
(8) PWM / PFM Swi tching Duty Rat io (PFMD uty) vs .
Temperature (Ta) (S-8356/58 Series)
(9)
OFF/ON
Pin Input Voltage “H” (V
SH
) vs. Temperature (Ta)
VOUT = 3.3 V, fOSC = 100 kHz VOUT = 3.3 V, fOSC = 300 kHz
5
10
15
20
25
−40 −20 0 20 40 60 80 100
Ta [°C]
PFMDuty [%]
0
0.2
0.4
0.6
0.8
1.0
−
40
−
20 0 20 40 60 80 100
Ta [°C]
VSH [V]
(10)
OFF/ON
Pin Input Voltage “L” 1 (V
SL1
) vs.
Temperature (Ta)
(11)
OFF/ON
Pin Input Voltage “L” 2 (V
SL2
) vs. Temperatuer (Ta)
VOUT = 3.3 V, fOSC = 300 kHz VOUT = 1.4 V, fOSC = 300 kHz
0
0.2
0.4
0.6
0.8
1.0
−40 −20 0 20 40 60 80 100
Ta [°C]
V
SL1
[V]
0
0.2
0.4
0.6
0.8
1.0
−
40
−
20 0 20 40 60 80 100
Ta [°C]
V
SL2
[V]
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0_00 S-8355/56/57/58 Series
Seiko Instruments Inc. 45
(12) Soft Start Time (t
SS
) vs. Temperature (Ta) (V
OUT
= 3.3 V)
fOSC = 100 kHz fOSC = 300 kHz
0
2
4
6
8
−40 −20 0 20 40 60 80 100
Ta [°C]
t
SS
[ms]
0
2
4
6
8
−
40
−
20 0 20 40 60 80 100
Ta [°C]
tSS [ms]
fOSC = 600 kHz
0
2
4
6
8
−40 −20 0 20 40 60 80 100
Ta [°C]
t
SS
[ms]
(13) Operation Start Voltage (V
ST1
) vs. Temperature (Ta) (14) Oscillation Start Voltage (V
ST2
) vs. Temperature (Ta)
VOUT = 3.3 V, fOSC = 100 kHz VOUT = 3.3 V, fOSC = 100 kHz
0
0.2
0.4
0.6
0.8
1.0
1.2
−40 −20 0 20 40 60 80 100
Ta [°C]
VST1 [V]
0
0.2
0.4
0.6
0.8
1.0
1.2
−
40
−
20 0 20 40 60 80 100
Ta [°C]
V
ST2
[V]
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series Rev.7.0_00
Seiko Instruments Inc.
46
(15) Output Voltage (V
OUT
) vs. Temperature (Ta) (V
OUT
= 3.3 V)
fOSC = 100 kHz fOSC = 300 kHz
3.20
3.25
3.30
3.35
3.40
−40 −20 0 20 40 60 80 100
Ta [°C]
V
OUT
[V]
3.20
3.25
3.30
3.35
3.40
−
40
−
20 0 20 40 60 80 100
Ta [°C]
V
OUT
[V]
fOSC = 600 kHz
3.20
3.25
3.30
3.35
3.40
−40 −20 0 20 40 60 80 100
Ta [°C]
V
OUT
[V]
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0_00 S-8355/56/57/58 Series
Seiko Instruments Inc. 47
2. Examples of Major Pow er Supply Dependence Characteristics (Ta = 25 °C)
(1) Current Consumption 1 (I
SS1
) vs. Power Supply Voltage (V
DD
), Current Consumption 2 (I
SS2
) vs. Power Supply Voltage (V
DD
)
(V
OUT
= 3.3 V)
fOSC = 300 kHz fOSC = 600 kHz
0
10
20
30
40
50
0 2 4 6 8 10
V
DD
[V]
I
SS1,2
[μA]
0
20
40
60
80
100
0 2 4 6 8 10
V
DD
[V]
I
SS1,2
[μA]
(2) C urrent C onsumptio n at Shu tdown (I
SSS
) vs. Power Supply Voltage (V
DD
)
VOUT = 3.3 V, fOSC = 300 kHz
0
0.2
0.4
0.6
0.8
1.0
I
SSS
[μA]
0 2 4 6 8 10
V
DD
[V]
(3) Oscillation Friquency (f
OSC
) vs. Power Supply Voltage (V
DD
)
fOSC = 100 kHz fOSC = 300 kHz
20
40
60
80
100
120
0 2 4 6 8 10
V
DD
[V]
f
OSC
[kHz]
0 2 4 6 8 10
V
DD
[V]
f
OSC
[kHz]
60
120
180
240
300
360
fOSC = 600 kHz
0 2 4 6 8 10
V
DD
[V]
f
OSC
[kHz]
120
240
360
480
600
720
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series Rev.7.0_00
Seiko Instruments Inc.
48
(4) Maximum Duty Ratio (MaxDuty) vs. Power Supply Voltage (V
DD
)
fOSC = 100 kHz fOSC = 300 kHz
0 2 4 6 8 10
V
DD
[V]
50
60
70
80
90
100
MaxDuty [%]
0 2 4 6 8 10
V
DD
[V]
50
60
70
80
90
100
MaxDuty [%]
fOSC = 600 kHz
0 2 4 6 8 10
V
DD
[V]
50
60
70
80
90
100
MaxDuty [%]
(5) EXT Pin Output Current “H” (I
EXTH
) vs.
Power Supply Voltage (V
DD
) (6) EXT Pin Output Current “L” (I
EXTL
) vs.
Power Supply Voltage (V
DD
)
0 2 4 6 8 10
V
DD
[V]
0
−20
−40
−60
−80
−100
I
EXTH
[mA]
0 2 4 6 8 10
V
DD
[V]
0
−
20
−
40
−
60
−
80
−
100
I
EXTL
[mA]
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0_00 S-8355/56/57/58 Series
Seiko Instruments Inc. 49
(7) Output Voltage (V
OUT
) vs. Power Supply Voltage (V
DD
) (V
DD
Separate Type, V
OUT
= 3.3 V, V
IN
= 1.98 V, I
OUT
=
66 mA)
fOSC = 100 kHz f OSC = 300 kHz
0 2 4 6 8 10
V
DD
[V]
1.5
2.0
2.5
3.0
3.5
V
OUT
[V]
0 2 4 6 8 10
V
DD
[V]
1.5
2.0
2.5
3.0
3.5
V
OUT
[V]
fOSC = 600 kHz
0 2 4 6 8 10
V
DD
[V]
1.5
2.0
2.5
3.0
3.5
V
OUT
[V]
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series Rev.7.0_00
Seiko Instruments Inc.
50
3. Output Waveforms
(1) S-8358B33MC
IOUT = 1 mA IOUT = 20 mA
−25
−20
−15
−10
−
5 0 5 10 15 20 25
ti me [ μs]
4
2
0
3.40
3.35
3.30
3.25
Out p ut v olt ag e
[0.05 V / div]
CONT voltage
[2.0 V / div]
4
2
0
−
25
−
20
−
15
−
10
−5 0 5 10 15 20 25
ti me [ μs]
3.40
3.35
3.30
3.25
Output voltage
[0.05 V / div]
CONT voltage
[2.0 V / div]
IOUT = 100 mA IOUT = 200 mA
4
2
0
3.40
3.35
3.30
3.25
−25
−20
−15
−10
−
5 0 5 10 15 20 25
ti me [ μs]
Out p ut v olt ag e
[0.05 V / div]
CONT voltage
[2.0 V / div]
4
2
0
−
25
−
20
−
15
−
10
−5 0 5 10 15 2025
ti me [ μs]
3.40
3.35
3.30
3.25
Output voltage
[0.05 V / div]
CONT voltage
[2.0 V / div]
(2) S-8358F33MC
IOUT = 1 mA IOUT = 10 mA
4
2
0
3.40
3.35
3.30
3.25
−10
−8 −6 −4
−
2 0 2 4 6 8 10
ti me [ μs]
Out p ut v olt ag e
[0.05 V / div]
CONT voltage
[2.0 V / div]
4
2
0
−
10
−
8
−
6
−
4 −2 0 2 4 6 8 10
3.40
3.35
3.30
3.25
ti me [ μs]
Output voltage
[0.05 V / div]
CONT voltage
[2.0 V / div]
IOUT = 100 mA IOUT = 200 mA
4
2
0
−10
−8 −6 −4
−
2 0 2 4 6 8 10
ti me [ μs]
3.40
3.35
3.30
3.25
Out p ut v olt ag e
[0.05 V / div]
CONT voltage
[2.0 V / div]
4
2
0
−
10
−
8
−
6
−
4 −2 0 2 4 6 8 10
ti me [ μs]
3.40
3.35
3.30
3.25
Output voltage
[0.05 V / div]
CONT voltage
[2.0 V / div]
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0_00 S-8355/56/57/58 Series
Seiko Instruments Inc. 51
(3) S-8358N33MC
IOUT = 1 mA IOUT = 10 mA
4
2
0
−5 −4 −3 −2
−
1 0 1 2 3 4 5
ti me [ μs]
3.40
3.35
3.30
3.25
Out p ut v olt ag e
[0.05 V / div]
CONT voltage
[2.0 V / div]
4
2
0
−
5
−
4
−
3
−
2 −1 0 1 2 3 4 5
ti me [ μs]
3.40
3.35
3.30
3.25
Output voltage
[0.05 V / div]
CONT voltage
[2.0 V / div]
IOUT = 100 mA IOUT = 200 mA
4
2
0
−5 −4 −3 −2
−
1 0 1 2 3 4 5
ti me [ μs]
3.40
3.35
3.30
3.25
Out p ut v olt ag e
[0.05 V / div]
CONT voltage
[2.0 V / div]
4
2
0
−
5
−
4
−
3
−
2 −1 0 1 2 3 4 5
ti me [ μs]
3.40
3.35
3.30
3.25
Output voltage
[0.05 V / div]
CONT voltage
[2.0 V / div]
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series Rev.7.0_00
Seiko Instruments Inc.
52
4. Examples of Transient Resp onse Characteristics
(1) Power-On (VIN : 0 V→2 V)
100 kHz, IOUT = 1 mA 100 kHz, IOUT = 100 mA
0
2
−1 0 1 2 3 4 5 6 7 8 9
time [ms]
V
IN
[V]
0
2
4
V
OUT
[V]
V
IN
V
OUT
0
2
V
IN
[V]
−
1 0 1 2 3 4 5 6 7 8 9
time [ms]
0
2
4
V
OUT
[V]
V
IN
V
OUT
300 kHz, IOUT = 1 mA 300 kHz, IOUT = 100 mA
0
2
V
IN
[V]
−1 0 1 2 3 4 5 6 7 8 9
time [ms]
0
2
4
V
OUT
[V]
V
IN
V
OUT
0
2
V
IN
[V]
−
1 0 1 2 3 4 5 6 7 8 9
time [ms]
0
2
4
V
OUT
[V]
V
IN
V
OUT
600 kHz, IOUT = 1 mA 600 kHz, IOUT = 100 mA
0
2
V
IN
[V]
−1 0 1 2 3 4 5 6 7 8 9
time [ms]
0
2
4
V
OUT
[V]
V
IN
V
OUT
0
2
V
IN
[V]
−
1 0 1 2 3 4 5 6 7 8 9
time [ms]
0
2
4
V
OUT
[V]
V
IN
V
OUT
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0_00 S-8355/56/57/58 Series
Seiko Instruments Inc. 53
(2) OFFON/ Pin Response ( OFF/ON
V : 0 V → 2.0 V)
100 kHz, IOUT = 1 mA 100 kHz, IOUT = 100 mA
0
2
V
ON/OFF
[V]
−1 0 1 2 3 4 5 6 7 8 9
time [ms]
0
2
4
V
OUT
[V]
V
OUT
V
ON/OFF
0
2
V
ON/OFF
[V]
−
1 0 1 2 3 4 5 6 7 8 9
time [ms]
0
2
4
V
OUT
[V]
V
ON/OFF
V
OUT
300 kHz, IOUT = 1 mA 300 kHz, IOUT = 100 mA
0
2
V
ON/OFF
[V]
−1 0 1 2 3 4 5 6 7 8 9
time [ms]
0
2
4
V
OUT
[V]
V
ON/OFF
V
OUT
0
2
V
ON/OFF
[V]
−
1 0 1 2 3 4 5 6 7 8 9
time [ms]
0
2
4
V
OUT
[V]
V
ON/OFF
V
OUT
600 kHz, IOUT = 1 mA 600 kHz, IOUT = 100 mA
0
2
V
ON/OFF
[V]
−1 0 1 2 3 4 5 6 7 8 9
time [ms]
0
2
4
V
OUT
[V]
V
ON/OFF
V
OUT
0
2
VON/OFF [V]
−
1 0 1 2 3 4 5 6 7 8 9
time [ms]
0
2
4
VOUT [V]
VON/OFF
VOUT
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series Rev.7.0_00
Seiko Instruments Inc.
54
(3) Load Fluctuations
100 kHz, IOUT : 100 μA → 100 mA 100 kHz, IOUT : 100 mA → 100 μA
−0.2 0 0.2 0.4
0.60.8
1.0 1.2
1.4 1.61.8
ti me [ms]
3.00
3.20
3.40
3.60
V
OUT
[0.2 V / div]
100 μA
I
OUT
100 mA
V
OUT
[0.2 V / div]
100
μ
A
I
OUT
100 mA
3.20
3.40
3.60
3.80
−
10 010 20 30 40 50 60 70 80 90
ti me [ms]
300 kHz, IOUT : 100 μA → 100 mA 300 kHz, IOUT : 100 mA → 100 μA
V
OUT
[0.2 V / div]
100 μA
I
OUT
100 mA
−0.5 0 0.5 1.0
1.52.0
2.5 3.0
3.5 4.04.5
ti me [ms]
3.00
3.20
3.40
3.60
V
OUT
[0.2 V / div]
100
μ
A
I
OUT
100 mA
3.20
3.40
3.60
3.80
−
10 010 20 30 40 50 60 70 80 90
ti me [ms]
600 kHz, IOUT : 0.1 mA → 100 mA 600 kHz, IOUT : 100 mA → 0.1 mA
V
OUT
[0.2 V / div]
100 μA
I
OUT
100 mA
3.00
3.20
3.40
3.60
−0.2 0 0.2 0.4
0.60.8
1.0 1.2
1.4 1.61.8
ti me [ms]
V
OUT
[0.2 V / div]
100
μ
A
I
OUT
100 mA
3.00
3.20
3.60
3.80
−
0.5 00.5 1.0 1.5 2.5 3.0
2.0
ti me [ms]
3.40
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0_00 S-8355/56/57/58 Series
Seiko Instruments Inc. 55
(4) Input Voltage Fluctuations (IOUT = 100 mA)
100 kHz, VIN = 1.98 V → 2.64 V 100 kHz, VIN = 2.64 V → 1.98 V
3.25
3.30
3.35
3.40
3.45
3.0
2.5
2.0
1.5
−0.2 0 0.2 0.4
0.6 0.81.0 1.2
1.4 1.6
1.8
ti me [ms]
V
OUT
[V]
V
IN
[V]
3.0
2.5
2.0
1.5
V
IN
[V]
−
0.2 00.20.40.60.8
1.0 1.2
1.4 1.6
1.8
ti me [ms]
3.25
3.30
3.35
3.40
3.45
V
OUT
[V]
300 kHz, VIN = 1.98 V → 2.64 V 300 kHz, VIN = 2.64 V → 1.98 V
3.0
2.5
2.0
1.5
−0.2 0 0.2 0.4
0.6 0.81.0 1.2
1.4 1.6
1.8
ti me [ms]
3.25
3.30
3.35
3.40
3.45
V
IN
[V]
V
OUT
[V]
3.0
2.5
2.0
1.5
V
IN
[V]
−
0.2 00.20.40.60.8
1.0 1.2
1.4 1.6
1.8
ti me [ms]
3.25
3.30
3.35
3.40
3.45
V
OUT
[V]
600 kHz, VIN = 1.98 V → 2.64 V 600 kHz, VIN = 2.64 V → 1.98 V
3.0
2.5
2.0
1.5
V
IN
[V]
−0.2 0 0.2 0.4
0.6 0.81.0 1.2
1.4 1.6
1.8
ti me [ms]
3.25
3.30
3.35
3.40
3.45
V
OUT
[V]
3.0
2.5
2.0
1.5
V
IN
[V]
−
0.2 00.20.40.60.8
1.0 1.2
1.4 1.6
1.8
ti me [ms]
3.25
3.30
3.35
3.40
3.45
V
OUT
[V]
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series Rev.7.0_00
Seiko Instruments Inc.
56
Reference Data
Use this reference data to choose the e xternal parts. T his reference d ata makes it possible to c hoose t he recommend ed
external part based on the applicati on and characteristics data.
1. External Parts for Reference Data
Table 32 Efficiency vs. Output Current Characteristics and Output Voltage vs. Output Current Characteristics for External
Condition Product Name Oscill ation
Frequency Output
Voltage Control
System Inductor Transistor Diode Output capacitor
1 S-8357F33 300 kHz 3.3 V PWM
2 S-8357F50 300 kHz 5.0 V PWM
3 S-8356M50 300 kHz 5.0 V PWM/PFM CDRH104R-220
4 S-8357B33 100 kHz 3.3 V PWM
5 S-8358B33 100 kHz 3.3 V PWM/PFM
6 S-8357B50 100 kHz 5.0 V PWM CDRH104R-470
F93 (16 V, 47
μ
F)
×
2
7 S-8356M50 300 kHz 5.0 V PWM/PFM CDRH8D28-220
8 S-8357B33 100 kHz 3.3 V PWM
9 S-8358B33 100 kHz 3.3 V PWM/PFM
10 S-8357B50 100 kHz 5.0 V PWM CDRH8D28-470
FDN335N M1FH3
F93 (16 V, 47
μ
F)
11 S-8357F33 300 kHz 3.3 V PWM
12 S-8356M50 300 kHz 5.0 V PWM/PFM CXLP120-220 MCH3405 MA2Z748 F92 (6.3 V, 47
μ
F)
13 S-8357N33 600 kHz 3.3 V PWM
14 S-8357N50 600 kHz 5.0 V PWM
15 S-8356Q33 600 kHz 3.3 V PWM/PFM
16 S-8356Q50 600 kHz 5.0 V PWM/PFM
CDRH8D28-100 FDN 335N M1FH3 F93 (16 V, 47
μ
F)
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0_00 S-8355/56/57/58 Series
Seiko Instruments Inc. 57
The properties of the externa l parts are shown below.
T a b l e 3 3 Properties of External Parts
Compornent Product Name Manufacturer Characteristics
CDRH104R-2 20 22 μH, DCR*1 = 73 m Ω, IMAX.*2 = 2.5 A,
Component height = 4 .0 mm
CDRH104R-4 70 47 μH, DCR*1 = 128 mΩ, IMAX.*2 = 1.9 A,
Component height = 4 .0 mm
CDRH8D28-1 00 10 μH, DCR*1 = 47 m Ω, IMAX.*2 = 2.7 A,
Component height = 3 .0 mm
CDRH8D28-2 20 22 μH, DCR*1 = 99 m Ω, IMAX.*2 = 1.8 A,
Component height = 3 .0 mm
CDRH8D28-4 70
Sumida Corporation
47 μH, DCR*1 = 195 mΩ, IMAX.*2 = 1.25 A,
Component height = 3 .0 mm
Inductor
CXLP120-220 Sumitomo Specia l Metals Co., L td . 22 μH, DCR*1 = 590 mΩ, IMAX.*2 = 0.55 A,
Component height = 1 .2 mm
M1FH3 Shindengen Electri c Manu facturing Co., Ltd. VF*3 = 0.3 V, IF*4 = 1.5 A
Diode MA2Z748 Ma tsushi ta El ectric Industrial Co., Ltd. VF*3 = 0.4 V, IF*4 = 0.3 A
F93 16 V, 47 μF Capacito r
(Output Capacitance) F92 Nichicon Corporation 6.3 V, 47 μF
FDN335N Fairchild Se micon du cto r Japan Ltd. VDSS *5 = 20 V max., VGSS*6 = 8 V max.,
CISS*7 = 310 pF, ID*8 = 1.5 A
(VGS*6 = 2.5 V)
Transistor
(Nch FET) MCH3405 Sanyo Electric Co., Ltd. VDSS *5 = 20 V max.,VGSS*6 = 10 V max.,
CISS*7 = 280 pF, ID*8 = 0.5 A
(VGS*6 = 1.8 V)
*1. Direct current resistance
*2. Maximum allowable current
*3. Forward voltage
*4. Forward current
*5. Drain source voltage
*6. Gate source voltage
*7. Input capacitance
*8. Drain current
Caution The values shown in the characteristics co lumn of Table 33 above are based on the materials pro vided by
each manufacture. However, consider the characteristics of the original materials when using the above
products.
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series Rev.7.0_00
Seiko Instruments Inc.
58
2. Output Current (IOUT) vs. Efficiency (η) Characteristics, Output Current (IOUT) vs. Output Voltage (VOUT) C haracteristics
The following sho ws the actual (a) Output current (IOUT) vs. Efficiency (η) characteristics and (b) Outp ut current (IOUT)
vs. Output voltage (VOUT) characteristics under the conditions of No. 1 to 16 in Table 32.
Condition 1 S-8357F33
(a) Output current (IOUT) vs. Efficiency (η) (b) Output current (IOUT) vs. Output voltage (VOUT)
20
40
60
80
100
1 10 100 1000
V
IN
= 0.9 V
V
IN
= 1.8 V
V
IN
= 2.7 V
0.1
η [%]
I
OUT
[mA]
3.0
3.1
3.2
3.3
3.4
3.5
0.1 1 10 100 1000
V
IN
=
0.9 V
V
IN
=
1.8 V
V
IN
=
2.7 V
V
OUT
[
V
]
IOUT [mA]
Condition 2 S-8357F50
(a) Output current (IOUT) vs. Efficiency (η) (b) Output current (IOUT) vs. Output voltage (VOUT)
20
40
60
80
100
1 10 100 1000
VIN= 2.0 V
V IN= 3.0 V
V IN= 4.0 V
0.1
η [%]
IOUT [mA]
4.7
4.8
4.9
5.0
5.1
5.2
0.1 1 10 100 1000
V
IN
=
2.0 V
V
IN
=
3.0 V
V
IN
=
4.0 V
V
OUT
[
V
]
I
OUT
[mA]
Condition 3 S-8356M50
(a) Output current (IOUT) vs. Efficiency (η) (b) Output current (IOUT) vs. Output voltage (VOUT)
20
40
60
80
100
1 10 100 1000
VIN= 2.0 V
V IN= 3.0 V
V IN= 4.0 V
0.1
η [%]
IOUT [mA]
4.7
4.8
4.9
5.0
5.1
5.2
0.1 1 10 100 1000
V
IN
=
2.0 V
V
IN
=
3.0 V
V
IN
=
4.0 V
V
OUT
[
V
]
I
OUT
[mA]
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0_00 S-8355/56/57/58 Series
Seiko Instruments Inc. 59
Condition 4 S-8357B33
(a) Output current (IOUT) vs. Efficiency (η) (b) Output current (IOUT) vs. Output voltage (VOUT)
20
40
60
80
100
1 10 100 1000
V
IN
= 0.9 V
V
IN
= 1.8 V
V
IN
= 2.7 V
0.1
η [%]
I
OUT
[mA]
3.0
3.1
3.2
3.3
3.4
3.5
0.1 1 10 100 1000
V
IN
=
0.9 V
V
IN
=
1.8 V
V
IN
=
2.7 V
V
OUT
[V]
I
OUT
[mA]
Condition 5 S-8358B33
(a) Output current (IOUT) vs. Efficiency (η) (b) Output current (IOUT) vs. Output voltage (VOUT)
20
40
60
80
100
1 10 100 1000
V
IN
= 0.9 V
V
IN
= 1.8 V
V
IN
= 2.7 V
0.1
η [%]
I
OUT
[mA]
3.0
3.1
3.2
3.3
3.4
3.5
0.1 1 10 100 1000
V
IN
=
0.9 V
V
IN
=
1.8 V
V
IN
=
2.7 V
V
OUT
[V]
I
OUT
[mA]
Condition 6 S-8357B50
(a) Output current (IOUT) vs. Efficiency (η) (b) Output current (IOUT) vs. Output voltage (VOUT)
20
40
60
80
100
1 10 100 1000
V
IN
= 2.0 V
V
IN
= 3.0 V
V
IN
= 4.0 V
0.1
η [%]
I
OUT
[mA]
4.7
4.8
4.9
5.0
5.1
5.2
0.1 1 10 100 1000
V
IN
=
2.0 V
V
IN
=
3.0 V
V
IN
=
4.0 V
V
OUT
[V]
I
OUT
[mA]
Condition 7 S-8357M50
(a) Output current (IOUT) vs. Efficiency (η) (b) Output current (IOUT) vs. Output voltage (VOUT)
20
40
60
80
100
1 10 100 1000
V
IN
= 2.0 V
V
IN
= 3.0 V
V
IN
= 4.0 V
0.1
η [%]
I
OUT
[mA]
4.7
4.8
4.9
5.0
5.1
5.2
0.1 1 10 100 1000
V
IN
=
2.0 V
V
IN
=
3.0 V
V
IN
=
4.0 V
V
OUT
[V]
I
OUT
[mA]
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series Rev.7.0_00
Seiko Instruments Inc.
60
Condition 8 S-8357B33
(a) Output current (IOUT) vs. Efficiency (η) (b) Output current (IOUT) vs. Output voltage (VOUT)
20
40
60
80
100
1 10 100 1000
V
IN
= 0.9 V
V
IN
= 1.8 V
V
IN
= 2.7 V
0.1
η [%]
I
OUT
[mA]
3.0
3.1
3.2
3.3
3.4
3.5
0.1 1 10 100 1000
V
IN
=
0.9 V
V
IN
=
1.8 V
V
IN
=
2.7 V
VOUT [V]
IOUT [mA]
Condition 9 S-8358B33
(a) Output current (IOUT) vs. Efficiency (η) (b) Output current (IOUT) vs. Output voltage (VOUT)
20
40
60
80
100
1 10 100 1000
V
IN
= 0.9 V
V
IN
= 1.8 V
V
IN
= 2.7 V
0.1
η [%]
I
OUT
[mA]
3.0
3.1
3.2
3.3
3.4
3.5
0.1 1 10 100 1000
V
IN
=
0.9 V
V
IN
=
1.8 V
V
IN
=
2.7 V
V
OUT
[V]
I
OUT
[mA]
Condition 10 S-8357B50
(a) Output current (IOUT) vs. Efficiency (η) (b) Output current (IOUT) vs. Output voltage (VOUT)
20
40
60
80
100
1 10 100 1000
V
IN
= 2.0 V
V
IN
= 3.0 V
V
IN
= 4.0 V
0.1
η [%]
I
OUT
[mA]
4.7
4.8
4.9
5.0
5.1
5.2
0.1 1 10 100 1000
V
IN
=
2.0 V
V
IN
=
3.0 V
V
IN
=
4.0 V
VOUT [V]
IOUT [mA]
Condition 11 S-8357F33
(a) Output current (IOUT) vs. Efficiency (η) (b) Output current (IOUT) vs. Output voltage (VOUT)
20
40
60
80
100
1 10 100 1000
V
IN
= 0.9 V
V
IN
= 1.8 V
V
IN
= 2.7 V
0.1
η [%]
I
OUT
[mA]
3.0
3.1
3.2
3.3
3.4
3.5
0.1 1 10 100 1000
V
IN
=
0.9 V
V
IN
=
1.8 V
V
IN
=
2.7 V
VOUT [V]
IOUT [mA]
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0_00 S-8355/56/57/58 Series
Seiko Instruments Inc. 61
Condition 12 S-8356M50
(a) Output current (IOUT) vs. Efficiency (η) (b) Output current (IOUT) vs. Output voltage (VOUT)
20
40
60
80
100
1 10 100 1000
V
IN
= 2.0 V
V
IN
= 3.0 V
V
IN
= 4.0 V
0.1
η [%]
I
OUT
[mA]
4.7
4.8
4.9
5.0
5.1
5.2
0.1 1 10 100 1000
V
IN
=
2.0 V
V
IN
=
3.0 V
V
IN
=
4.0 V
VOUT [V]
IOUT [mA]
Condition 13 S-8357N33
(a) Output current (IOUT) vs. Efficiency (η) (b) Output current (IOUT) vs. Output voltage (VOUT)
20
40
60
80
100
1 10 100 10000.1
η [%]
I
OUT
[mA]
0
V
IN
= 0.9 V
V
IN
= 1.8 V
V
IN
= 2.7 V
3.0
3.1
3.2
3.3
3.4
3.5
VOUT [V]
1 10 100 10000.1 IOUT [mA]
V
IN
=
0.9 V
V
IN
=
1.8 V
V
IN
=
2.7 V
Condition 14 S-8357N50
(a) Output current (IOUT) vs. Efficiency (η) (b) Output current (IOUT) vs. Output voltage (VOUT)
20
40
60
80
100
1 10 100 10000.1
η [%]
I
OUT
[mA]
0
V
IN
= 2.0 V
V
IN
= 3.0 V
V
IN
= 4.0 V
4.7
4.8
4.9
5.0
5.1
5.2
VOUT [V]
1 10 100 10000.1 IOUT [mA]
V
IN
=
2.0 V
V
IN
=
3.0 V
V
IN
=
4.0 V
Condition 15 S-8356Q33
(a) Output current (IOUT) vs. Efficiency (η) (b) Output current (IOUT) vs. Output voltage (VOUT)
20
40
60
80
100
1 10 100 10000.1
η [%]
I
OUT
[mA]
0
V
IN
= 1.8 V
V
IN
= 2.7 V
3.0
3.1
3.2
3.3
3.4
3.5
VOUT [V]
1 10 100 10000.1 IOUT [mA]
V
IN
=
1.8 V
V
IN
=
2.7 V
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series Rev.7.0_00
Seiko Instruments Inc.
62
Condition 16 S-8356Q50
(a) Output current (IOUT) vs. Efficiency (η) (b) Output current (IOUT) vs. Output voltage (VOUT)
20
40
60
80
100
1 10 100 10000.1
η [%]
I
OUT
[mA]
0
V
IN
= 3.0 V
V
IN
= 4.0 V
4.7
4.8
4.9
5.0
5.1
5.2
VOUT [V]
1 10 100 10000.1 IOUT [mA]
V
IN
=
3.0 V
V
IN
=
4.0 V
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0_00 S-8355/56/57/58 Series
Seiko Instruments Inc. 63
3. Output Current (IOUT) vs. Ripple Voltage (Vr) Characteristics
The following shows the actual Output current (IOUT) vs. Ripple voltage (Vr) characteristics and (b) Output current
(IOUT) vs. Output voltage (VOUT) characteristics under the conditions of No. 1 to 16 in Table 32.
Condition 1 S-8357F33 Condition 2 S-8357F50
0
50
100
150 V
IN
=0.9 V
V
IN
=1.8 V
V
IN
=2.7 V
Vr [mV]
I
OUT
[mA]
0.1 1 10 100 1000
0
50
100
150 V
IN
=
2.0 V
V
IN
=
3.0 V
V
IN
=
4.0 V
Vr [mV]
I
OUT
[mA]
0.1 1 10 100 1000
Condition 3 S-8356M50 Condition 4 S-8357B33
0
50
100
150 V
IN
=2.0 V
V
IN
=3.0 V
V
IN
=4.0 V
Vr [mV]
IOUT [mA]
0.1 1 10 100 1000
0
50
100
150 V
IN
=
0.9 V
V
IN
=
1.8 V
V
IN
=
2.7 V
Vr [mV]
IOUT [mA]
0.1 1 10 100 1000
Condition 5 S-8358B33 Condition 6 S-8357B50
0
50
100
150 V
IN
=0.9 V
V
IN
=1.8 V
V
IN
=2.7 V
Vr [mV]
IOUT [mA]
0.1 1 10 100 1000
0
50
100
150 V
IN
=
2.0 V
V
IN
=
3.0 V
V
IN
=
4.0 V
Vr [mV]
IOUT [mA]
0.1 1 10 100 1000
Condition 7 S-8356M50 Condition 8 S-8357B33
0
50
100
150 V
IN
=2.0 V
V
IN
=3.0 V
V
IN
=4.0 V
Vr [mV]
I
OUT
[mA]
0.1 1 10 100 1000
0
50
100
150 V
IN
=
0.9 V
V
IN
=
1.8 V
V
IN
=
2.7 V
Vr [mV]
I
OUT
[mA]
0.1 1 10 100 1000
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series Rev.7.0_00
Seiko Instruments Inc.
64
Condition 9 S-8358B33 Condition 10 S-8357B50
0
50
100
150 V
IN
=0.9 V
V
IN
=1.8 V
V
IN
=2.7 V
Vr [mV]
I
OUT
[mA]
0.1 1 10 100 1000
0
50
100
150 V
IN
=
2.0 V
V
IN
=
3.0 V
V
IN
=
4.0 V
Vr [mV]
I
OUT
[mA]
0.1 1 10 100 1000
Condition 11 S-8357F33 Condition 12 S-8356M50
0
50
100
150 V
IN
=0.9 V
V
IN
=1.8 V
V
IN
=2.7 V
Vr [mV]
I
OUT
[mA]
0.1 1 10 100 1000
0
50
100
150 V
IN
=
2.0 V
V
IN
=
3.0 V
V
IN
=
4.0 V
Vr [mV ]
I
OUT
[mA]
0.1 1 10 100 1000
Condition 13 S-8357N33 Condition 14 S-8357N50
0
50
100
150
Vr [mV]
I
OUT
[mA]
0.1 1 10 100 1000
V
IN
=0.9 V
V
IN
=1.8 V
V
IN
=2.7 V
0
50
100
150
Vr [mV]
IOUT [m A]
0.1 1 10 100 1000
V
IN
=
2.0 V
V
IN
=
3.0 V
V
IN
=
4.0 V
Condition 15 S-8356Q33 Condition 16 S-8356Q50
0
50
100
150
Vr [mV]
IOUT [m A]
0.1 1 10 100 1000
V
IN
=1.8 V
V
IN
=2.7 V
0
50
100
150
Vr [mV]
I
OUT
[mA]
0.1 1 10 100 1000
V
IN
=
3.0 V
V
IN
=
4.0 V
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
2.9±0.2
0.95±0.1
1.9±0.2
+0.1
-0.05
0.16
0.4±0.1
1
23
No. MP003-A-P-SD-1.1
MP003-A-P-SD-1.1
SOT233-A-PKG Dimensions
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
1.6±0.1
0.25±0.05
4.0±0.1
2.0±0.1
4.0±0.1
1.5 +0.1
-0.05
1.1±0.1
2.85±0.2
No. MP003-A-C-SD-1.1
MP003-A-C-SD-1.1
SOT233-A-Carrier Tape
Feed direction
1
23
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
(60°)
(60°)
ø13±0.2
12.5max.
9.0±0.3
QTY. 3,000
No. MP003-A-R-SD-1.1
MP003-A-R-SD-1.1
SOT233-A-Reel
Enlarged drawing in the central part
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
2.9±0.2
1.9±0.2
0.95±0.1
0.4±0.1
0.16 +0.1
-0.06
123
4
5
No. MP005-A-P-SD-1.2
MP005-A-P-SD-1.2
SOT235-A-PKG Dimensions
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
ø1.5 +0.1
-0 2.0±0.05
ø1.0 +0.2
-0 4.0±0.1
1.4±0.2
0.25±0.1
3.2±0.2
123
45
No. MP005-A-C-SD-2.1
MP005-A-C-SD-2.1
SOT235-A-Carrier Tape
Feed direction
4.0±0.1(10 pitches:40.0±0.2)
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
12.5max.
9.0±0.3
ø13±0.2
(60°) (60°)
QTY. 3,000
No. MP005-A-R-SD-1.1
MP005-A-R-SD-1.1
SOT235-A-Reel
Enlarged drawing in the central part
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
0.4±0.05
1.5±0.1
4.5±0.1
1.6±0.2
1.5±0.1 1.5±0.1
0.45±0.1
0.4±0.1
0.4±0.1
45°
312
No. UP003-A-P-SD-1.1
UP003-A-P-SD-1.1
SOT893-A-PKG Dimensions
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
2.0±0.1
0.3±0.05
8.0±0.1
ø1.5+0.1
-0
2.0±0.05
ø1.5+0.1
-0
4.75±0.1
5° max.
No. UP003-A-C-SD-1.1
UP003-A-C-SD-1.1
SOT893-A-Carrier Tape
Feed direction
4.0±0.1(10 pitches : 40.0±0.2)
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
13.0±0.3
16.5max.
(60°)
(60°)
QTY. 1,000
No. UP003-A-R-SD-1.1
UP003-A-R-SD-1.1
SOT893-A-Reel
Enlarged drawing in the central part
1.8±0.15
0.5±0.1 0.5±0.1
0.8±0.05
0.14±0.05
R(0.075)
0.2±0.08
(0.125)
123
456
SNB6B-A-PKG Dimensions
No. BD006-A-P-SD-3.0
Seiko Instruments Inc.
No.
TITLE
SCALE
UNIT mm
BD006-A-P-SD-3.0
The heatsink of back side has different electric
potential depending on the product.
Confirm specifications of each product.
Do not use it as the function of electrode.
0.2±0.08
No.
TITLE
SCALE
UNIT mm
4.0±0.1
2.0±0.05
4.0±0.1
ø1.5±0.1
2.2±0.1
1.1±0.1
0.25±0.05
ø1.1±0.1
Seiko Instruments Inc.
Feed direction
SNB6B-A-Carrier Tape
No. BD006-A-C-SD-2.1
BD006-A-C-SD-2.1
1
2
3
6
5
4
QTY. 3,000
No.
TITLE
SCALE
UNIT mm
12.5max.
9.0±0.3
ø13±0.2
Seiko Instruments Inc.
Enlarged drawing in the central part
SNB6B-A-Reel
No. BD006-A-R-SD-1.1
BD006-A-R-SD-1.1
www.sii-ic.com
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