S-818 Series
www.sii-ic.com LOW DROPOUT CMOS VOLTAGE REGULATOR
© Seiko Instruments Inc., 2000-2010 Rev.3.0_00
Seiko Instruments Inc. 1
The S-818 Series is a positive voltage regulator deve loped by CMOS technology and featured by low dropout
voltage, high output voltage accuracy and low current consumption.
Built-in low on-resistance tran sistor provides low dropout voltage and large output current. A ceramic capacitor
of 2 μF or more can be used as an outpu t capacitor. A shutdown circuit ensures long battery life.
The SOT-23-5 miniaturized package and the SOT-89-5 package are recomme nded for configuring portable
devices and large output current applications, re spectively.
Features
• Low current consumption: At operation mode: Typ. 30 μA, Max. 40 μA
At shutdown mode: Typ. 100 nA, Max. 500 nA
• Output voltage: 2.0 to 6.0 V, selectable in 0.1 V steps.
• High accuracy output voltage: ±2.0%
• Peak output current: 200 mA capable (3.0 V output product, VIN=4 V)*1
300 mA capable (5.0 V output product, VIN=6 V)*1
• Low dropout voltage: Typ. 170 mV (5.0 V output product, IOUT=60 mA)
• A ceramic cap acitor (2 μF or more) can be used as an output capacitor.
• Built-in shutdown circuit
• Lead-free, Sn 100%, halogen-free*2
*1. Attention should be paid to the power dissipation of the package when the output current is large.
*2. Refer to “ Product Name Structure” for details.
Applications
• Power source for battery-powered devices, personal communication devices and home electric/electronic
appliances
Packages
• SOT-23-5
• SOT-89-5
LOW DROPOUT CMOS VOLTAGE REGULATOR
S-818 Series Rev.3.0_00
Seiko Instruments Inc.
2
Block Diagram
VOUT
ON/OFF
VSS
VIN
*1
ON/OFF
circuit
Reference
voltage
+
−
*1. Parasitic diode Figure 1
LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.3.0_00 S-818 Series
Seiko Instruments Inc. 3
Product Name Structure
1. Product Name
S-818 x xx A 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 tape specifications*1
Product name (abbreviat ion)*2
Package name (abbrevi ation)
MC : SOT-23-5
UC : SOT-89-5
Output voltage
20 to 60
(e.g., When the output voltage is 2.0 V,
it is expressed as 20.)
Product ty p e*3
A: ON/OFF pin positive logic, high active
B: ON/OFF pin negative logic, low active
*1. Refer to the tape specifications at the end of this boo k.
*2. Refer to the “Table 1” under the “3. Product name list”.
*3. Refer to “3. ON/OFF pin (Shutdown pin)” in the “ Operation”.
2. Package
Drawing Code
Package Name Package Tape Reel
SOT-23-5 MP005-A-P-SD MP005-A-C-SD MP005-A-R-SD
SOT-89-5 UP005-A-P-SD UP005-A-C-SD UP005-A-R-SD
LOW DROPOUT CMOS VOLTAGE REGULATOR
S-818 Series Rev.3.0_00
Seiko Instruments Inc.
4
3. Product name list
Table 1
Output Voltage SOT-23-5 SOT-89-5
2.0 V±2.0 % S-818A20AMC-BGAT2x S-818A20AUC-BGAT2x
2.1 V±2.0 % S-818A21AMC-BGBT2x S-818A21AUC-BGBT2x
2.2 V±2.0% S-818A22AMC-BGCT2x S-818A22AU C-BGCT 2x
2.3 V±2.0% S-818A23AMC-BGDT2x S-818A23AU C-BGDT 2x
2.4 V±2.0% S-818A24AMC-BGET2x S-818A24AUC-BGET2x
2. 5 V±2.0% S-818A25AMC-BGFT2x S-818A25A UC-BGF T2x
2. 6 V±2.0% S-818A26AMC-BGGT2x S-818A26AUC-BGGT2x
2.7 V±2.0% S-818A27AMC-BGHT2x S-818A27AU C-BGHT 2x
2.8 V±2.0% S-818A28AMC-BGIT2x S-818A28AUC-B GIT2x
2.9 V±2.0% S-818A29AMC-BGJT2x S-818A29AUC-BGJT2x
3.0 V±2.0% S-818A30AMC-BGKT2x S-818A30AUC-BGKT2x
3.1 V±2.0% S-818A31AMC-BGLT2x S-818A31AUC-BGLT2x
3. 2 V±2.0% S-818A32AMC-BGMT2x S-818A32AUC-BGMT2x
3.3 V±2.0% S-818A33AMC-BGNT2x S-818A33AU C-BGNT 2x
3. 4 V±2.0% S-818A34AMC-BGOT2x S-818A34AUC-BGOT2x
3.5 V±2.0% S-818A35AMC-BGPT2x S-818A35AUC-BGPT2x
3. 6 V±2.0% S-818A36AMC-BGQT2x S-818A36AUC-BGQT2x
3.7 V±2.0% S-818A37AMC-BGRT2x S-818A37AU C-BGRT 2x
3.8 V±2.0% S-818A38AMC-BGST2x S-818A38AUC-BGST2x
3. 9 V±2.0% S-818A39AMC-BGTT2x S-818A39A UC-BGT T2x
4.0 V±2.0% S-818A40AMC-BGUT2x S-818A40AU C-BGUT 2x
4.1 V±2.0% S-818A41AMC-BGVT2x S-818A41AUC-BGVT2x
4.2 V±2.0% S-818A42AMC-BGWT2x S-818A42AUC-BGWT2x
4.3 V±2.0% S-818A43AMC-BGXT2x S-818A43AUC-BGXT2x
4.4 V±2.0% S-818A44AMC-BGYT2x S-818A44AUC-BGYT2x
4. 5 V±2.0% S-818A45AMC-BGZT2x S-818A45A UC-BGZ T2x
4. 6 V±2.0% S-818A46AMC-BHAT2x S-818A46AU C-BHAT2x
4. 7 V±2.0% S-818A47AMC-BHBT2x S-818A47AU C-BHBT2x
4.8 V±2.0% S-818A48AMC-BHCT2x S-818A48AUC-BHCT2x
4.9 V±2.0% S-818A49AMC-BHDT2x S-818A49AUC-BHDT2x
5. 0 V±2.0% S-818A50AMC-BHET2x S-818A50AU C-BHET2x
5.1 V±2. 0% S-818A51AMC-BHFT2x S-818A51AUC-BHFT2x
5.2 V±2.0% S-818A52AMC-BHGT2x S-818A52AUC-BHGT2x
5.3 V±2.0% S-818A53AMC-BHHT2x S-818A53AUC-BHHT2x
5.4 V±2.0% S-818A54AMC-BHIT2x S-818A54AUC-BHIT2x
5.5 V±2.0% S-818A55AMC-BHJT2x S-818A55AUC-BHJT2x
5. 6 V±2.0% S-818A56AMC-BHKT2x S-818A56AU C-BHKT2x
5.7 V±2.0% S-818A57AMC-BHLT2x S-818A57AUC-BHLT2x
5. 8 V±2.0% S-818A58AMC-BHMT2x S-818A58AUC-BHMT2x
5.9 V±2.0% S-818A59AMC-BHNT2x S-818A59AUC-BHNT2x
6.0 V±2.0% S-818A60AMC-BHOT2x S-818A60AUC-BHOT2x
Remark 1. Please contact our sales o ffice for type B products.
2. x: G or U
3. Please select products of environmental code = U for Sn 100%, halogen-free pro ducts.
LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.3.0_00 S-818 Series
Seiko Instruments Inc. 5
Pin Configurations
Table 2
Pin No. Symbol Pin description
1 VIN Input voltage pin
2 VSS GND pin
3 ON/OFF Shutdown pin
4
NC*1 No connection
5 VOUT Output voltage pin
SOT-23-5
Top view
5 4
3
2
1
*1. The NC pin is electrically open.
The NC pin can be connected to VIN or VSS.
Figure 2
Table 3
Pin No. Symbol Pin description
1 VOUT Output voltage pin
2 VSS GND pin
3 NC*1 No connection
4 ON/OFF Shutdown pin
5 VIN Input voltage pin
SOT-89-5
Top view
1 3
2
4
5
*1. The NC pin is electrically open.
The NC pin can be connected to VIN or VSS.
Figure 3
LOW DROPOUT CMOS VOLTAGE REGULATOR
S-818 Series Rev.3.0_00
Seiko Instruments Inc.
6
Absolute Maximum Ratings
Table 4 (Ta=25°C unless otherwi se specified)
Item Symbol Absolute Maximum Rating Unit
VIN V
SS−0.3 to VSS+12 V
Input voltage VON/OFF V
SS−0.3 to VSS+12 V
Output voltage VOUT V
SS−0.3 to VIN+0.3 V
250 (When not mounted on board) mW
SOT-23-5 600*1 mW
500 (When not mounted on board) mW
Power dissipation SOT-89-5 PD
1000*1 mW
Operating ambient temperature Topr −40 to +85 °C
Storage temperature Tstg −40 to +125 °C
*
1. When mounted on board
[Mounted on board]
(1) Board size : 114.3 mm × 76.2 mm × t1.6 mm
(2) Board 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 exc eeded under any conditions.
600
400
0
Power Dissipation (P
D
) [mW]
200
0 50 100 150
Ambient Temperature
(
Ta
)
[°C]
800
1000
SOT-23-5
SOT-89-5
Figure 4 Power Dissipation of Package (When Mounted on Board)
LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.3.0_00 S-818 Series
Seiko Instruments Inc. 7
Electrical Characteristics
Table 5 (Ta=25°C unless otherwi se specified)
Parameter Symbol Conditions Min. Typ. Max. Unit Test
circuit
Output voltage*1 V
OUT(E) VIN=VOUT(S)+1 V, IOUT=30 mA VOUT(S)
×0.98 VOUT(S)
VOUT(S)
×1.02 V 1
Output current*2 I
OUT 2.0 V≤VOUT(S)≤2.4 V 100*5 ⎯ ⎯ mA 3
VOUT(S)+1 V≤
VIN≤10 V 2.5 V≤VOUT(S)≤2.9 V 150*5 ⎯ ⎯ mA 3
3.0 V≤VOUT(S)≤3.9 V 200*5 ⎯ ⎯ mA 3
4.0 V≤VOUT(S)≤4.9 V 250*5 ⎯ ⎯ mA 3
5.0 V≤VOUT(S)≤6.0 V 300*5 ⎯ ⎯ mA 3
Dropout voltage*3 V
drop IOUT=60 mA 2.0 V≤VOUT(S)≤2.4 V ⎯ 0.51 0.87 V 1
2.5 V≤VOUT(S)≤2.9 V ⎯ 0.38 0.61 V 1
3.0 V≤VOUT(S)≤3.4 V ⎯ 0.30 0.44 V 1
3.5 V≤VOUT(S)≤3.9 V ⎯ 0.24 0.33 V 1
4.0 V≤VOUT(S)≤4.4 V ⎯ 0.20 0.26 V 1
4.5 V≤VOUT(S)≤4.9 V ⎯ 0.18 0.22 V 1
5.0 V≤VOUT(S)≤5.4 V ⎯ 0.17 0.21 V 1
5.5 V≤VOUT(S)≤6.0 V ⎯ 0.17 0.20 V 1
Line regulation 1 OUTIN
1OUT
VV
Δ
VΔ
• VOUT(S)+0.5 V≤VIN≤10 V,
IOUT=30 mA ⎯ 0.05 0.2 %/V 1
Line regulation 2 OUTIN
2OUT
VV
Δ
VΔ
• VOUT(S)+0.5 V≤VIN≤10 V,
IOUT=10 μA ⎯ 0.05 0.2 %/V 1
Load regulation ΔVOUT3 VIN=VOUT(S)+1 V,
10 μA≤IOUT≤80 mA ⎯ 30 50 mV 1
Output voltage
temperature coefficient*4 OUT
OUT
VTaΔ
VΔ
• VIN=VOUT(S)+1 V, IOUT=30 mA,
−40°C≤Ta≤85°C ⎯ ±100 ⎯ ppm
/°C1
Current consumption
at operation ISS1 VIN=VOUT(S)+1 V,
ON/OFF pin=ON, no load ⎯ 30 40
μA2
Current consumption
at shutdown ISS2 VIN=VOUT(S)+1 V,
ON/OFF pin=OFF, no load ⎯ 0.1 0.5
μA2
Input voltage VIN ⎯ ⎯ ⎯ 10 V 1
Shutdown pin
input voltage "H" VSH VIN=VOUT(S)+1 V, RL=1 kΩ,
Judged by VOUT output level. 1.5 ⎯ ⎯ V 4
Shutdown pin
input voltage "L" VSL VIN=VOUT(S)+1 V, RL=1 kΩ,
Judged by VOUT output level. ⎯ ⎯ 0.3 V 4
Shutdown pin
input current "H" ISH VIN=VOUT(S)+1 V, VON/OFF=7 V −0.1 ⎯ 0.1 μA4
Shutdown pin
input current "L" ISL VIN=VOUT(S)+1 V, VON/OFF=0 V −0.1 ⎯ 0.1 μA4
Ripple rejection RR VIN=VOUT(S)+1 V, f=100 Hz,
ΔVrip=0.5 V p-p, IOUT=30 mA ⎯ 45 ⎯ dB 5
LOW DROPOUT CMOS VOLTAGE REGULATOR
S-818 Series Rev.3.0_00
Seiko Instruments Inc.
8
*1. VOUT(S)=Specified output voltage
VOUT(E)=Effective output voltage
i.e., The output voltage when fixing IOUT (=30 mA) and inputting VOUT(S)+1.0 V.
*2. Output current at which output voltage becomes 95 % of VOUT(E) after gradually increasing output current.
*3. Vdrop=VIN1*1−(VOUT(E)×0.98)
*1. The Input voltage at which output voltage becomes 98 % of VOUT(E) after gradually decreasing input
voltage.
*4. Output voltage shift by temperature [mV/°C] is calculated using the following equation.
[] [] []
1000Cppm/
VTaΔ
VΔ
VVCmV/
TaΔ
VΔ
OUT
OUT
OUT(S)
OUT ÷°
•
×=° 3*2**1
*1. Temperature change ratio for output voltage
*2. Specified output voltage
*3. Output voltage temperature coefficient
*5. These figures mean that every part can sup ply output curre nt at least to these values
LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.3.0_00 S-818 Series
Seiko Instruments Inc. 9
Test Circuits
1.
VSS
VOUT
ON/OFF
VIN
V
A
Set to
power ON
+
+
Figure 5
2.
VSS
VOUT
ON/OFF
VIN
A
Se t to
VIN or G ND
Figure 6
3.
VSS
VOUT
ON/OFF
VIN
V
A
Se t to
power ON
+
+
Figure 7
4.
VSS
VOUT
ON/OFF
VIN
V
A RL
+
+
Figure 8
5.
VSS
VOUT
ON/OFF
VIN
V
Set to
power ON
RL
+
Figure 9
LOW DROPOUT CMOS VOLTAGE REGULATOR
S-818 Series Rev.3.0_00
Seiko Instruments Inc.
10
Application Conditions
Input capacitor (CIN): 0.47 μF or more
Output capacitor (CL): 2 μF or more
Equivalent series resistor (ESR): 10 Ω or less
Input series resistor (RIN) 10 Ω or less
Caution A general series regulator may oscillate, depending on the external components selected.
Check that no oscillation occurs with the application using the abov e capacitor.
Standard Circuit
VSS
VOUT VIN
CIN
*1
CL
*
2
INPUT OUTPUT
GND
Single GND
*
1. CIN is a capacitor used to stabilize input. Use a capacitor of 0.47 μF or more
*
2. In addition to a tantalum capacitor, a ceramic ca pacitor of 2.0 μF or more can be used for CL.
Figure 10
Caution The above connection diagram and constan t will not guarantee successful operation.
Perform through evaluation using the actual application to set the constant.
Technical Terms
1. Low dropout voltage regulator
The low dropout voltage regulator is a voltage regulator having a low dropout vol t age characteristic due to
the internal low on-resistan ce transistor.
2. Output voltage (VOUT)
The accuracy of the output voltage is ensured at ±2.0 % under the specified conditions of input voltage,
output current, and temperature, which differ product by product.
Caution When the abov e conditions are changed, the output voltage may vary and go out of the
accuracy range of the outpu t voltage. Refer to the “ Electrical Characteristics” and
“ Characteristics” for details.
3. Line regulation 1 (ΔVOUT1) and Line regulation 2 (ΔVOUT2)
Line regulation indicates the input voltage depe ndence of the output voltage. The value shows how much
the output voltage changes due to the change of the input voltage when the outp ut current is kept
constant.
LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.3.0_00 S-818 Series
Seiko Instruments Inc. 11
4. Load regulation (ΔVOUT3)
Load regulation indicates the output current dependence of output voltage. The value shows how much
the output voltage changes due to the change of the output current when the input voltage is kept
constant.
5. Dropout voltage (Vdrop)
Let VIN1 be an input voltage where the output voltage falls to the 98 % of the actual output voltage
(VOUT(E)) when gradually decreasing in put voltage. The dropout voltage is the difference between the VIN1
and the resultant output voltage defined as following e quation.
Vdrop=VIN1−(VOUT(E)×0.98)
6. Temperature coefficient of output voltage ⎟
⎠
⎞
⎜
⎝
⎛
•OUT
OUT
VΔTa
ΔV
The output voltage lies in the shaded area in the whole operating te mperature shown in Figure 11 when
the temperature coefficient of the output voltage is ±100 ppm/°C.
−40 25
+
0.28mV/°C
V
OUT [V]
V
OUT(E)*1
85 Ta
[
°C
]
−
0.28mV/°C
*1. The value of the output voltage measured at 25°C.
Figure 11 Temperature coefficient of outpu t voltage (Ex. Typ. product for S-818A28A)
Temperature change ratio for output voltage [mV/°C] is calcul ated by using the following equation.
[] [] []
1000Cppm/
VTaΔ
VΔ
VVCmV/
TaΔ
VΔ
OUT
OUT
OUT(S)
OUT ÷°
•
×=° 3*2**1
*1. Temperature change ratio for output voltage
*2. Specified output voltage
*3. Output voltage temperature coefficient
LOW DROPOUT CMOS VOLTAGE REGULATOR
S-818 Series Rev.3.0_00
Seiko Instruments Inc.
12
Operation
1. Basic Operation
Figure 12 shows the block diagram of the S-818 Series.
The error amplifier compa r es a reference voltage (Vref) with the part of the output voltage divide d by the
feedback resistors Rs and Rf. It supplie s the output transistor with the gate voltage, necessary to ensure
certain output voltage free of any fluctuations of input voltage and temperature.
VOUT
*1
VSS
VIN
RS
Rf
Error amplifier
Current source
Vref
−
+
Reference
voltage circuit
*1. Parasitic diode
Figure 12 Block diagram
2. Output Transistor
The S-818 Series uses a Pch MOS FET as the outp ut transistor.
Be sure that VOUT does not exceed VIN+0.3 V to prevent the voltage regulator from being damaged due to
inverse current flowing from VOUT pin throu gh a parasitic diode to VIN pin.
LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.3.0_00 S-818 Series
Seiko Instruments Inc. 13
3. ON/OFF pin (Shutdo wn pin)
This pin activates and inactivates the regulator.
When the ON/OFF pin is switched to the shutdown level, the operation of all internal circuit stops, the
built-in Pch MOS FET output transistor between VIN and VOUT pin is switched off, suppressing current
consumption. The VOUT pin goes to the Vss level due to internal divided resistance of several MΩ
between VOUT pin and VSS pin.
The structure of the ON/OFF pin is shown in Figure 13. Since the ON/OFF pin is neither pulled down nor
pulled up internally, do not keep it in the floating state. Current consumption increases if a voltage of
0.3 V to VIN−0.3 V is applied to the ON/OFF pin. When the sh utdo wn pin is not used, connect it to the VIN
pin for product type "A" and to the VSS pin for product type "B".
Table 6 ON/OFF pin function by product type
Product type ON/OFF pin Internal circuit VOUT pin voltage Current consumption
A “H”: Power on Operating Set value Iss1
A “L”: Shutdown Stop VSS level Iss2
B “H”: Shutdown Stop VSS level Iss2
B “L”: Power on Operating Set value Iss1
ON/OFF
VIN
VSS
Figure 13 The structure of the ON/OFF Pin
Selection of Output Capacitor (CL)
The S-818 Series needs an output capacitor between VOUT pin and VSS pin for phase compensation. A
small ceramic or an OS electrolyte capacitor of 2 μF or more can be use d. Whe n a tantalum or an
aluminum electrolyte capacitor is used, the capacitance must be 2 μF or more and the ESR must be 10 Ω
or less.
Attention should be paid not to cause an oscillation due to increase of ESR at low temperatures when an
aluminum electrolyte capacitor is used.
Evaluate the performance inclu ding temperature characteristics bef ore prototyping the circuit.
Overshoot and undershoot characteristics differ depending upon the type of the output capacitor. Refer
to the “CL dependence” data in “ Transient Response Characteristics”.
LOW DROPOUT CMOS VOLTAGE REGULATOR
S-818 Series Rev.3.0_00
Seiko Instruments Inc.
14
Precautions
• Wiring patterns for the VIN pin, VOUT pin and GND pin should be designed so that the impedance is low.
When mounting an output capacitor (CL) or an input capacitor (CIN), the distance from the capacitor to the
VOUT pin and to the VSS pin should be as short as possible.
• Note that output voltage may increase when a voltage regulator is used at low load current (Le ss than
10 μA).
• To prevent oscillation, the external components should be used under the following conditions:
Input capacitor (CIN): 0.47μF or more
Output capacitor (CL): 2 μF or more
Equivalent series resistance (ESR): 10 Ω or less
Input series resistan ce (RIN): 10 Ω or less
• The voltage regulator may oscill ate when the impedance of the power supply is high and the input
capacitor is small or not connected.
• The application condition for input voltage and load current should not exceed the package power
dissipation.
• In determining output current, attention should be paid to the output current value specified and footnote *5
in Table 5 in the “ Electrical Characteristics”.
• Do not apply an electrostatic discharg e to this IC that exceeds the perfo rmance ratings of the built-in
electrostatic protection circuit.
• SII claims no responsibility for any and all disputes arising out of or in connection with any in fringement by
products including this IC of patents o wned by a third party.
LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.3.0_00 S-818 Series
Seiko Instruments Inc. 15
Characteristics (Typical data)
1. Output Voltage (VOUT) vs. Output Current (IOUT) (When load current increases)
S-818A20A S-818A30A
1.0
2.0
0
0.2
0.4
0.6
0.8
I
OUT
[A]
V
OUT
[V]
V
IN
=2.3 V
4 V
5 V
3 V
10 V
2.5 V
(Ta=25 °C)
0.0
(Ta=25 °C)
0.0
1.0
2.0
3.0
00.2
0.4
0.6
0.8
I
OUT
[A]
V
OUT
[V]
10 V
6 V
5 V
4V
3.5 V
V
IN
=
3.3 V
S-818A50A
(Ta=25 °C)
0.0
1.0
2.0
3.0
4.0
5.0
6.0
0 0.2 0.4 0.6 0.8
I
OUT
[A]
V
OUT
[V]
7 V
V
IN
=5.3 V
5.5 V 6 V
8 V 10 V
Remark In determining ne cessary output current,
consider the following parameters:
1. Output current value in the “ Electrical
Characteristics” and footn ote *5.
2. Power dissipation of the package
2. Output voltage (VOUT) vs. Input voltage (VIN)
S- 818A 20A ( Ta= 25° C )
1.0
1.5
2.0
2.5
1234
VIN(V)
VOUT(V)
60mA
IOUT=10μA
1mA 30mA
100μA
S- 818A 30A ( Ta= 25° C)
1.5
2.0
2.5
3.0
3.5
2345
VIN(V)
VOUT(V)
30mA60mA
IOUT=10μA
1mA
100μA
S- 818A50A ( Ta= 25°C )
4.0
4.5
5.0
5.5
4567
VIN(V)
VOUT(V)
30mA
60mA
1mA
IOUT=10μA
100μA
LOW DROPOUT CMOS VOLTAGE REGULATOR
S-818 Series Rev.3.0_00
Seiko Instruments Inc.
16
3. Maximum output current (IOUTmax) vs. Input voltage (VIN)
S-818A20A S-818A30A
0.0
0.2
0.4
0.6
0.8
0 2 4 6 8 10
V
IN
[V]
I
OUTmax
[A]
85 °C
Ta=−40 °C 25 °C
0.0
0.2
0.4
0.6
0.8
0 2 4
6
8
10
V
IN
[V]
I
OUTmax
[A]
85 °C
25 °C
Ta=−40 °C
S-818A50A
0.0
0.2
0.4
0.6
0.8
0 2 4 6 8 10
V
IN
[V]
I
OUTmax
[A]
Ta=−40 °C 85 °C
25 °C
Remark In determining ne cessary output current,
consider the following parameters:
1. Output current value in the “ Electrical
Characteristics” and footn ote *5.
2. Power dissipation of the package
4. Dropout voltage (Vdrop) vs. Output current (IOUT)
S-818A20A S-818A30A
0
500
1000
1500
2000
0
50
100
150
200
250 300
Ta=−40 °C
25 °C
85 °C
V
drop
[mV]
I
OUT
[mA]
0
500
1000
1500
2000
0100
200
300
400
Ta=−40 °C
25 °C
V
drop
[mV]
85 °C
I
OUT
[mA]
S-818A50A
0
500
1000
1500
2000
0
100
200
300
400
500
600
Ta=−40 °C
25 °C
V
dro
p
[mV]
85 °C
I
OUT
[mA]
LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.3.0_00 S-818 Series
Seiko Instruments Inc. 17
5. Output voltage (VOUT) vs. Ambient temperature (Ta)
S-818A20A S-818A30A
1.96
1.98
2.00
2.02
2.04
−50 0 50 100
Ta [° C]
V
OUT
[V]
V
IN
=3 V, I
OUT
=30 mA
2.94
2.97
3.00
3.03
3.06
−50 050
100
Ta [° C]
V
OUT
[V]
V
IN
=4 V, I
OUT
=30 mA
S-818A50A
4.90
4.95
5.00
5.05
5.10
−50
0
50
100
Ta [° C]
V
IN
=6 V, I
OUT
=30 mA
VOUT [V]
6. Line regulation (ΔVOUT1) vs. Ambient temperature (Ta)
S-818A20A/S-818A30A/S-818A50A
0
5
10
15
20
25
30
35
−50 0 50 100
Ta [° C]
V
OUT
=2 V
V
IN
=V
OUT(S)
+0.5 ↔10 V, I
OUT
=30 mA
5 V
3 V
ΔV
OUT1
[mV]
7. Load regulation (ΔVOUT3) vs. Ambient temperature (Ta)
S-818A20A/S-818A30A/S-818A50A
0
10
20
30
40
50
−50
0
50
100
5V
3 V
V
IN
=V
OUT(S)
+1 V, I
OUT
=10 μA↔80 mA
ΔVOUT3 [mV]
Ta [° C]
V
OUT
=2 V
LOW DROPOUT CMOS VOLTAGE REGULATOR
S-818 Series Rev.3.0_00
Seiko Instruments Inc.
18
8. Current consumption (ISS1) vs. Input voltage (VIN)
S-818A30A
0
10
20
30
40
0246810
VIN
(V)
I1(uA)
Ta=-40°C
85°C
25°C
S-818A50A
0
10
20
30
40
0246810
VIN
(V)
I1(uA)
Ta=-40°C
85°C
25°C
9. Threshold voltage of ON/OFF pin (VSH/VSL) vs. Input voltage (VIN)
S-818A20A S-818A30A
0.0
0.5
1.0
1.5
2.0
2.5
2
4
6
8
10
V
IN
[V]
V
SH
/V
SL
[V]
V
SL
V
SH
0.0
0.5
1.0
1.5
2.0
2.5
3 5 7
8
10
V
IN
[V]
V
SH
/V
SL
[V]
V
SH
V
SL
S-818A50A
0.0
0.5
1.0
1.5
2.0
2.5
5
6
8
9
10
V
IN
[V]
V
SH
/V
SL
[V]
V
SH
V
SL
Iss1(μA)
Iss1(μA)
Iss1(μA)
S-818A20A
0
10
20
30
40
0246810
VIN
(V)
I1(uA)
Ta=-40°C
85°C
25°C
VIN[V] VIN[V]
VIN[V]
Iss1(μA)
LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.3.0_00 S-818 Series
Seiko Instruments Inc. 19
10. Ripple rejection
S-818A20A
VIN=3 V, IOUT=30 mA, CIN=None, COUT=2 μF, 0.5 V p-p, Ta=25 °C
−100
−80
−60
−40
−20
0
0.1 1 10 100
f [kHz]
Ripple Reje c tion [d B]
S-818A30A
−100
−80
−60
−40
−20
0
0.1 1 10
100
f [kHz]
Ripple Rejection [dB]
V
IN
=4 V, I
OUT
=30 mA, C
IN
=None, C
OUT
=2 μF, 0.5 V p-p, Ta=25 °C
S-818A50A
−100
−80
−60
−40
−20
0
0.1 1 10 100
f [kHz]
Ripple Rejection [dB]
V
IN
=6 V, I
OUT
=30 mA, C
IN
=None, C
OUT
=2 μF, 0.5 V p-p, Ta=25 °C
LOW DROPOUT CMOS VOLTAGE REGULATOR
S-818 Series Rev.3.0_00
Seiko Instruments Inc.
20
Transient Response Characteristics (S-818A30A, Typical data, Ta=25°C)
Overshoot
Input voltage
or
Load current
O utput voltage Undershoot
1. Power on
VIN=0→10V IOUT=30mA
TIME(50usec/div)
VOUT(0.5V/div)
10V
CL=2μF
0V
0V
VIN
VOUT
CL=4.7μF
Load dependence of overshoot CL dependence of overshoot
0.0
0.2
0.4
0.6
0.8
1.0
1.E−05 1.E−04 1.E−03 1.E−02 1.E−01 1.E+00
I
OUT
[V]
5 V
3 V
V
OUT
=2 V
V
IN
=0 V→V
OUT(S)
+1 V, C
L
=2 μF
Over Shoot
[
V
]
0.0
0.2
0.4
0.6
0.8
1.0
1
10
100
C
L
[μF]
V
OUT
=2 V
V
IN
=0 V→V
OUT(S)
+1 V, I
OUT
=30 mA
3 V
5 V
Over Shoot
[
V
]
VDD dependence of overshoot Temperature dependence of overshoot
0.0
0.2
0.4
0.6
0.8
1.0
0
2
4 6
8
10
V
DD
[V]
5 V
3 V
V
IN
=0 V→V
DD
, I
OUT
=30 mA, C
L
=2 μF
Over Shoot
[
V
]
V
OUT
=2 V
0.0
0.2
0.4
0.6
0.8
1.0
−50
0
50
100
Ta [°C]
V
OUT
=
2 V
Over Shoot [V]
V
IN
=0 V→V
OUT(S)
+1 V, I
OUT
=30 mA, C
L
=2 μF
3 V
5 V
LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.3.0_00 S-818 Series
Seiko Instruments Inc. 21
2. Shutdown control
VIN=10V ON/OFF=0→10V IOUT=30mA
TIME(50usec/div)
VOUT(0.5V/div)
10V CL=4.7μF
CL=2μF
0V
0V
VIN
VOUT
Load dependenci es of overshoot CL dependence of overshoot
0.0
0.2
0.4
0.6
0.8
1.0
1.E−05
1.E−04
1.E−03 1.E−02
1.E−01 1.E+00
I
OUT
[A]
V
IN
=V
OUT(S)
+1 V, C
L
=2 μF, ON/OFF=0 V→V
OUT(S)
+1 V
5 V
3 V
V
OUT
=2 V
Over Shoot
[
V
]
0.0
0.2
0.4
0.6
0.8
1.0
110
100
C
L
[μF]
5V
3 V
V
OUT
=
2 V
V
IN
=V
OUT(S)
+1 V, C
L
=2 μF, ON/OFF=0 V→V
OUT(S)
+1 V
Over Shoot [V]
VDD dependencies of overshoot Temperature dependence of overshoot
0.0
0.2
0.4
0.6
0.8
1.0
0
2
4 6
8
10
V
DD
[V]
5 V
V
OUT
=2 V
V
IN
=V
DD
, I
OUT
=30 mA, C
L
=2 μF, ON/OF F=0 V→V
DD
3 V
Over Shoot [V]
0.0
0.2
0.4
0.6
0.8
1.0
−50 0
50
100
Ta [°C]
5V
3 V
V
OUT
=2 V
V
IN
=V
OUT(S)
+1 V, I
OUT
=30 mA, C
L
=2 μF, ON/OFF=0 V→V
OUT(S)
+1 V
Over Shoot
[
V
]
ON/OFF
LOW DROPOUT CMOS VOLTAGE REGULATOR
S-818 Series Rev.3.0_00
Seiko Instruments Inc.
22
3. Power fluctuation
VIN=4→10V IOUT=30mA
TIME(50usec/div)
VOUT(0.2V/div)
10V
CL=4.7μF
CL=2μF
4V
3V
VIN
VOU
T
TIME(50usec/div)
VOUT(0.2V/div)
10V
CL=4.7μF
CL=2μF
4V
3V
VIN
VOUT
VIN=10→4V IOUT=30mA
Load dependenci es of overshoot CL dependence of overshoot
0
0.2
0.4
0.6
1.E−05
1.E−04
1.E−03 1.E−02
1.E−01
1.E+00
I
OUT
[A]
5V
V
OUT
=
2 V
V
IN
=V
OUT(S)
+1 V→V
OUT(S)
+2 V, C
L
=2 μF
3 V
Over Shoot
[
V
]
0
0.01
0.02
0.03
0.04
0.05
1
10
100
CL [μF]
5V
VIN=VOUT(S)+1 V→VOUT(S)+2 V, I OUT=30 mA
3 V
VOUT=2 V
Over Shoot [V]
VDD dependencies of overshoot Temperature dependence
0
0.2
0.4
0.6
0
2
4
6
8
10
V
DD
[V]
V
OUT
=
2 V
V
IN
=V
OUT(S)
+1 V→V
DD
, I
OUT
=30 mA, C
L
=2 μF
3 V
5V
Over Shoot
[
V
]
0
0.01
0.02
0.03
0.04
0.05
0.06
−50 050
100
Ta [°C]
5 V
3 V
V
IN
=V
OUT(S)
+1 V→V
OUT(S)
+2 V, I
OUT
=30 mA, C
L
=2 μF
V
OUT
=
2 V
Over Shoot
[
V
]
LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.3.0_00 S-818 Series
Seiko Instruments Inc. 23
Load dependenci es of undershoot CL dependence of undershoot
0
0.1
0.2
0.3
1.E−05
1.E−04
1.E−03 1.E−02
1.E−01
1.E+00
I
OUT
[A]
5 V
V
OUT
=2 V
3 V
Und er Shoot
[
V
]
V
IN
=V
OUT(S)
+2 V→V
OUT(S)
+1 V, C
L
=2 μF
0
0.01
0.02
0.03
0.04
0.05
110 100
C
L
[μF]
5V
3V
V
OUT
=2 V
V
IN
=V
OUT(S)
+2 V→V
OUT(S)
+1 V, I
OUT
=30 mA
Und er Sh oot
[
V
]
VDD dependencies of unde rshoot Temperature dependen ce of undershoot
0
0.05
0.1
0.15
0.2
0
2
4 6
8
10
V
DD
[V]
V
OUT
=2 V
3 V
5 V
V
IN
=V
DD
→V
OUT(S)
+1 V, I
OUT
=30 mA, C
L
=2 μF
Under Shoot [V]
0
0.01
0.02
0.03
0.04
0.05
0.06
−50
050
100
Ta [°C]
5 V
3V V
OUT
=2 V
Under Shoot
[
V
]
V
IN
=V
OUT(S)
+2 V→V
OUT(S)
+1 V, I
OUT
=30 mA, C
L
=2 μF
LOW DROPOUT CMOS VOLTAGE REGULATOR
S-818 Series Rev.3.0_00
Seiko Instruments Inc.
24
4. Load fluctuation
IOUT=10μA→30m A VIN=4V
TIME(50μsec/div)
VOUT(0.2V/div)
30mA
CL=4.7μF
CL=2μF
10μ
A
3V
IOUT
VOUT
IOUT=30mA→10μA VIN=4V
TIME(20msec/div)
VOUT(0.1V/div)
30m
A
CL=4.7μF
CL=2μF
10μA
3V
IOUT
VOUT
Load current dependence of load fluctuation overshoot CL dependence of overshoot
0.0
0.2
0.4
0.6
0.8
1.0
1.E−03
1.E−02
1.E−01
1.E+00
ΔI
OUT
[A]
V
OUT
=2 V
V
IN
=V
OUT(S)
+1 V, C
L
=2 μF
5 V
3 V
Over Shoot [V]
Remark ΔIOUT shows larger load current at load current
fluctuation while smaller curre nt is fixed to
10 µA. For example ΔIOUT=1.E−02 (A) means
load current fluctuation from 10 mA to 10 µA.
0
0.05
0.1
0.15
0.2
1 10 100
CL [μF]
3 V
VIN=VOUT(S),+1 V, IOUT=30 mA→10 μA
VOUT=2 V
5V
Over Shoot [V]
VDD dependencies of overshoot Temperature dependence of overshoot
0
0.1
0.2
0.3
0
2
4
6
8
10
V
DD
[V]
5 V
3 V
V
OUT
=
2 V
V
IN
=V
DD
, I
OUT
=30 mA→10 μA, C
L
=2 μF
Over Shoot [V]
0
0.05
0.1
0.15
0.2
0.25
0.3
−50
0
50
100
Ta [°C]
V
IN
=V
OUT(S)
+1 V, I
OUT
=30 mA→10 μA, C
L
=2 μF
3 V
V
OUT
=
2 V 5 V
Over Shoot [V]
LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.3.0_00 S-818 Series
Seiko Instruments Inc. 25
Load current dependence of load fluctuation undershoot CL dependence of undershoot
0.0
0.2
0.4
0.6
0.8
1.0
1.E−03 1.E−02 1.E−01 1.E00
ΔI
OUT
[A]
5V
3 V
V
IN
=I
OUT(S)
+1 V, C
L
=2 μF
V
OUT
=2 V
Under Shoot [V]
Remark ΔIOUT shows larger load current at load current
fluctuation while smaller curre nt is fixed to
10 µA. For example ΔIOUT=1.E−02 (A) means
load current fluctuation from 10 µA to 10 mA.
0
0.1
0.2
0.3
0.4
1
10
100
CL [μF]
5V
3 V
VIN=VOUT(S)+1 V, IOUT=10 μA→30 mA
Under Shoot [V]
VOUT=2 V
VDD dependence of undershoot Tempe rature depe ndence of undershoot
0
0.1
0.2
0.3
0.4
0
2
4
6
8
10
V
DD
[V]
V
OUT
=2 V
V
IN
=V
DD
, I
OUT
=10 μA→30 mA, C
L
=2 μF
5 V
3V
Under Shoot [V]
0
0.1
0.2
0.3
0.4
0.5
−50
0
50
100
Ta [°C]
V
OUT
=
2 V 3 V
5 V
V
IN
=V
OUT(S)
+1 V, I
OUT
=10 μA→30 mA, C
L
=2 μF
Under Shoot [V]
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.
1.5±0.1 1.5±0.1
1.6±0.2
4.5±0.1
132
1.5±0.1
0.4±0.05
0.4±0.1
0.45±0.1
0.4±0.1
45°
0.3
54
No. UP005-A-P-SD-1.1
UP005-A-P-SD-1.1
SOT895-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.
1
32
54
No. UP005-A-C-SD-1.1
UP005-A-C-SD-1.1
SOT895-A-Carrier Tape
Feed direction
4.0±0.1(10 pitches : 40.0±0.2)
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
16.5max.
13.0±0.3
QTY. 1,000
(60°)
(60°)
No. UP005-A-R-SD-1.1
UP005-A-R-SD-1.1
SOT895-A-Reel
Enlarged drawing in the central part
www.sii-ic.com
• The information described herein is subject to change without notice.
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• Although Seiko Instruments Inc. exerts the greatest possible effort to ensure high quality and reliability, the
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