RN5RK SERIES
VFM STEP-UP DC/DC CONVERTER
NO.EA-045-181012
1
OUTLINE
The RN5RKxx1A/xx1B/xx2A Series are CMOS-based VFM (Chopper) Step-up DC/DC converter ICs with ultra
low supply current and high output voltage accuracy.
Each of the RN5RKxx1A/xx1B consists of an oscillator, a VFM control circuit, a driver transistor to have low
ON resistance (Lx switch), a reference voltage unit, a high speed comparator, resistors for voltage detection, an
Lx switch protection circuit and an internal chip enable circuit. A low ripple, high efficiency step-up DC/DC
converter can be composed of this RN5RKxx1A/xx1B with only three external components: an inductor, a diode
and a capacitor.
The RN5RKxx2A uses the same chip as what is employed in the RN5RKxx1A/1B IC and has a drive pin (EXT)
for an external transistor instead of an Lx pin. As it is possible to load a large output current with a power
transistor which has a low saturation voltage, RN5RKxx2A IC is recommendable to users who need an output
current as large as between several tens mA and several hundreds mA.
Using the chip enable function, it is possible to make the supply current on standby minimized.
Since the package for these ICs is SOT-23-5, high density mounting of the ICs on board is possible.
FEATURES
Small Number of External Components .............................. Only an inductor, a diode and a capacitor
(RN5RKxx1A/xx1B)
Standby Current ................................................................... Typ. 0A
Low Temperature-Drift Coefficient of Output Voltage........... Typ. 100ppm/C
Output Voltage Range .......................................................... 2.0V to 5.5V
Two Kinds of Duty Ratio ....................................................... 77% (xx1A, xx2A)/ 55% (xx1B)
High Output Voltage Accuracy ............................................. 2.5%
Small Packages ................................................................. SOT-23-5
High Efficiency ..................................................................... Typ. 85% (RN5RK301B, VIN=2V, IOUT=10mA)
Low Ripple and Low Noise
Including a Driver Transistor with Low ON Resistance ........ Only RN5RKxx1A/xx1B
Low Start-up Voltage ............................................................ Max.0.9V
APPLICATIONS
Power source for battery-powered equipment.
Power source for cameras, camcorders, VCRs, and hand-held communication equipment.
Power source for those appliances which require higher cell voltage than that of batteries.
RN5RK
NO.EA-045-181012
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OUTLINE DIAGRAM
RN5RKxx1x RN5RKxx2A
Lx 5
1
GND
4
VOUT
2
Vref
Chip Enable
CE
OSC 100kHz
VFM Control
Buffer
VLX limiter
＋
－
Error Amp.
LxSW
EXT 5
1
GND
4
VOUT
2
Vref
Chip Enable
CE
OSC 100kHz
VFM Control
Buffer
＋
－
Error Amp.
SELECTION GUIDE
The output voltage, the driver type and the duty cycle for the ICs can be selected at the user's request.
Product Name Package Quantity per Reel Pb Free Halogen Free
RN5RKxx$-TR-FE SOT-23-5 3,000 pcs ○ ○
xx：The output voltage can be designed in the range from 2.0V(20) to 5.5V(55) in 0.1V steps.
：Designation of Driver
（1）Internal Lx Tr. Driver
（2）External Tr. Driver
$：Designation of Duty Cycle
（A）77％
（B）55％
RN5RK
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PIN CONFIGURATIONS
SOT-23-5
1
4
5
23
(mark side)
PIN DISCRIPTION
RN5RKxx1x
RN5RKxx2A
Pin No. Symbol Description Pin No. Symbol Description
1 CE Chip Enable Pin 1 CE Chip Enable Pin
2 VOUT Step-up Output Monitoring Pin,
Power Supply (for device itself) 2 VOUT Step-up Output Monitoring Pin,
Power Supply (for device itself)
3 NC No Connection 3 NC No Connection
4 GND Ground Pin 4 GND Ground Pin
5 LX Switching Pin
(Nch Open Drain) 5 EXT External Tr. Drive Pin
(CMOS Output)
RN5RK
NO.EA-045-181012
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ABSOLUTE MAXIMUM RATINGS
RN5RKxx1x
Symbol Item Rating Unit
VOUT Step-up Output Pin Voltage –0.3 to 9.0 V
VLX Lx Pin Voltage –0.3 to 9.0 V
VCE CE Pin Voltage –0.3 to VOUT+0.3 V
ILX Lx Pin Output Current 500 mA
PD Power Dissipation (SOT-23-5)* 420 mW
Topt Operating Temperature Range –40 to 85 C
Tstg Storage Temperature Range –55 to 125 C
RN5RKxx2A
Symbol Item Rating Unit
VOUT Step-up Output Pin Voltage –0.3 to 9.0 V
VEXT EXT Pin Voltage –0.3 to VOUT+0.3 V
VCE CE Pin Voltage –0.3 to VOUT+0.3 V
IEXT EXT Pin Output Current 30 mA
PD Power Dissipation (SOT-23-5)*1 420 mW
Topt Operating Temperature Range –40 to 85 C
Tstg Storage Temperature Range –55 to 125 C
*)For Power Dissipation, please refer to PACKAGE INFORMATION.
ABSOLUTE MAXIMUM RATINGS
Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the
permanent damages and may degrade the life time and safety for both device and system using the device
in the field.
The functional operation at or over these absolute maximum ratings is not assured.
RN5RK
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ELECTRICAL CHARACTERISTICS
RN5RKxx1A/xx1B Topt25C
Symbol Item Conditions Min. Typ. Max. Unit
VOUT Output Voltage VIN
Set VOUT
0.6, IOUT=1mA
0.975 1.025 V
VIN Input Voltage 8.0 V
VOUT/
Topt
Output Voltage
Temperature Coefficient 40C
Topt
85C 100 ppm
/C
Vstart Start-Up Voltage VIN=0V2V*1 0.75 0.90 V
Vstart/
Topt
Start-Up Voltage
Temperature Coefficient
-40°C
Topt
85°C
VIN=0V2V*1 -1.6 mV/
C
Vhold Hold-on Voltage (xx1A) VIN=2V0V*1 0.7 V
Vhold Hold-on Voltage (xx1B) VIN=2V0V*1 0.9 V
IDD2 Supply Current2 VOUTVCE=Set VOUT+0.5V 2 5
A
Istandby Standby Current VOUT6V, VCE=0V 0.5 A
ILXleak Lx Leakage Current VOUTVLX=8V 1
A
fosc Maximum Oscillator
Frequency VOUTVCE=Set VOUT0.96 80 100 120 kHz
fosc/
Topt
Frequency Temperature
Coefficient -40°C
Topt
85°C 0.41 kHz/
C
Maxduty Oscillator Duty Cycle (xx1A) VOUTVCESet VOUT0.96,
ON (VLX "L" side)
70 77 85 
Oscillator Duty Cycle (xx1B) 47 55 63 
VLXlim VLX Voltage Limit VOUT
VCE=1.95V, Lx Switch ON 0.4 0.6 0.8 V
VCEH CE "H" Input Voltage VOUT
VCE=Set VOUT
0.96,
Judgment is made by the Lx
waveform
0.9 V
VCEL CE "L" Input Voltage 0.3 V
ICEH CE "H" Input Current VOUT6.0V, VCE6.0V -0.5 0 0.5 A
ICEL CE "L" Input Current VOUT6.0V, VCE0V -0.5 0 0.5 A
IDD1 Supply Current1 *2
2.0V
Set VOUT
2.4V 25 50 A
2.5V
Set VOUT
2.9V 30 55
A
3.0V
Set VOUT
3.4V 35 60
3.5V
Set VOUT
3.9V 40 65
4.0V
Set VOUT
4.4V 45 75
4.5V
Set VOUT
4.9V 50 80
5.0V
Set VOUT
5.5V 55 90
RN5RK
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Symbol Item Conditions Min. Typ. Max. Unit
ILX Lx Switching Current
2.0V
Set VOUT
2.4V, VLX0.4V 80
mA
2.5V
Set VOUT
2.9V, VLX0.4V 100
3.0V
Set VOUT
3.4V, VLX0.4V 120
3.5V
Set VOUT
3.9V, VLX0.4V 140
4.0V
Set VOUT
4.4V, VLX0.4V 160
4.5V
Set VOUT
4.9V, VLX0.4V 180
5.0V
Set VOUT
5.5V, VLX0.4V 200
*1)Condition: An Output load resistor RL is connected between VOUT and GND.
Note that the resistor RL has a resistance which makes an output current 1mA after step-up operation.
*2)The Supply Current 1 (IDD1) for IC itself is measured when the internal oscillator works continuously.
If the oscillator works intermittently, the supply current becomes smaller than the value which is written on
the above table.
RECOMMENDED OPERATING CONDITIONS (ELECTRICAL CHARACTERISTICS)
All of electronic equipment should be designed that the mounted semiconductor devices operate within the
recommended operating conditions. The semiconductor devices cannot operate normally over the
recommended operating conditions, even if when they are used over such conditions by momentary
electronic noise or surge. And the semiconductor devices may receive serious damage when they continue
to operate over the recommended operating conditions.
RN5RK
NO.EA-045-181012
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RN5RKxx2A Topt25C
Symbol Item Conditions Min. Typ. Max. Unit
VOUT Output Voltage
VOUT
VCE=0V6V,
Judgment is made by the EXT
waveform
0.975 1.025 V
VIN Input Voltage 8.0 V
VOUT/
Topt
Output Voltage
Temperature Coefficient 40C
Topt
85C 100 ppm
/C
Vstart Start-Up Voltage VOUTVCE=0V2V 0.7 0.8 V
IDD2 Supply Current2 VOUTVCE=Set VOUT+0.5V 2 5
A
Istandby Standby Current VOUT6V, VCE=0V 0.5 A
fosc Maximum Oscillator
Frequency VOUTVCESet VOUT0.96 80 100 120 kHz
fosc/
Topt
Frequency Temperature
Coefficient -40°C
Topt
85°C 0.41 kHz
/C
Duty Oscillator Duty Cycle VOUT
VCE=Set VOUT
0.96,
ON (VLX “H” side) 70 77 85 %
VCEH CE “H” Input Voltage VOUT
VCE=Set VOUT
0.96,
Judgment is made by the EXT
waveform
0.9 V
VCEL CE “L” Input Voltage 0.3 V
ICEH CE “H” Input Current VOUT6.0V, VCE6.0V -0.5 0 0.5 A
ICEL CE “L” Input Current VOUT6.0V, VCE0V -0.5 0 0.5 A
IDD1 Supply Current1 *1
2.0V
VOUT
2.9V, EXT no load 20 40 A
3.0V
VOUT
3.9V, EXT no load 25 50
A
3.0V
VOUT
3.4V, EXT no load 30 60
3.5V
VOUT
3.9V, EXT no load 35 70
IEXTH EXT “H” Output Current
2.0V
VOUT
2.4V, EXT no load -1.0
mA
2.5V
VOUT
2.9V, EXT no load -1.5
4.0V
VOUT
5.5V, EXT no load -2.0
IEXTL EXT “L” Output Current
2.0V
VOUT
2.9V, EXT no load 1.0
3.0V
VOUT
3.9V, EXT no load 1.5
4.0V
VOUT
5.5V, EXT no load 2.0
*1) The Supply Current 1 (IDD1) for IC itself is measured when the internal oscillator works continuously.
If the oscillator works intermittently, the supply current becomes smaller than the value which is written on
the above table.
RECOMMENDED OPERATING CONDITIONS (ELECTRICAL CHARACTERISTICS)
All of electronic equipment should be designed that the mounted semiconductor devices operate within the
recommended operating conditions. The semiconductor devices cannot operate normally over the
recommended operating conditions, even if when they are used over such conditions by momentary
electronic noise or surge. And the semiconductor devices may receive serious damage when they continue
to operate over the recommended operating conditions.
RN5RK
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TYPICAL APPLICATIONS AND TECHNICAL NOTES
RN5RKxx1x RN5RKxx2A
L : 100Ｈ (Sumida, CD54NP) L : 27H (Sumida, CD105NP)
SD : MA721 (
Matsushita Electronics, Schottky Type
)
SD : RB111C (Rohm, Schottky Type)
CL : 47
F (Tantalum Type) CL1 : 47
F (Tantalum Type)
CL2
: 47
F (Tantalum Type)
Tr : 2SD1628G
Rb
: 300
Cb
: 0.01
F
When you use these ICs, consider the following issues;
Set external components as close as possible to the IC and minimize the connection between the components
and the IC. In particular, a capacitor should be connected to VOUT pin with the minimum connection.
Make sufficient grounding. A large current flows through GND pin by switching. When the impedance of the
GND connection is high, the potential within the IC is varied by the switching current. This may result in unstable
operation of the IC.
Use capacitors with a capacity of 22F or more, and with good high frequency characteristics such as tantalum
capacitors.
We recommend you to use output capacitors with an allowable voltage at least 3 times as much as setting
output voltage. This is because there may be a case where a spike-shaped high voltage is generated by an
inductor when an Lx transistor is off.
Choose an inductor that has sufficiently small D.C. resistance and large allowable current and is hard to reach
magnetic saturation.
And if the value of inductance of an inductor is extremely small, the ILX may exceed the absolute maximum
rating at the maximum loading.
Use an inductor with appropriate inductance.
Use a diode of a Schottky type with high switching speed, and also pay attention to its current capacity.
The performance of power circuit with using this IC depends on external components. Choose the most suitable
components for your application.
EXT
GND
VOU
T
C
E
SD
L
C
L1
VIN
Tr Rb
Cb CL2
LX
GND
VOUT
CE
SD
L
CL
VIN
RN5RK
NO.EA-045-181012
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TEST CIRCUITS
Lx
SBD
CL
RL
GND
VOUT
L
VIN CE
V
C
L
1kΩ
A
Lx
GND
V
OUT
CE
Test Circuit 1 Test Circuit 2
CL
Oscilloscope
Lx
GND
VOUT
CE
Test Circuit 3
*)When VLXlim and ILX are measured, the 5resistor is used. Otherwise 1kis used.
Components Inductor (L) : 100H, 220H (Sumida Electric Co., Ltd; CD-54)
Diode (SBD) : MA721 (Matsushita Electronics Corporation; Schottky Type)
Capacitor (CL) : 47F (Tantalum Type)
Using these test circuits characteristics data has been obtained as shown on the following pages.
Test Circuit 1: Typical Characteristics (1)-(7)
Test Circuit 2: Typical Characteristics (9)-(11)
Test Circuit 3: Typical Characteristics (8), (12)-(16)
RN5RK
NO.EA-045-181012
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SBD
CL
Rb
Cb
L
VIN
Tr
V
EXT
GND
VOUT
CE
CL
A
EXT
GND
VOUT
CE
Test Circuit 1 Test Circuit 2
CL
EXT
GND
VOUT
CE
Oscilloscope
CL
Oscilloscope
EXT
100Ω
GND
VOUT
CE
Test Circuit 3 Test Circuit 4
Components Inductor (L) : 27H (Sumida Electric Co., Ltd; CD-104)
Diode (SBD) : RB111C (Rohm Co., Ltd; Schottky Type)
Capacitor (CL) : 47F2(Tantalum Type)
Transistor (Tr) : 2SD1628G
Base Resistor (Rb) : 300W Base Capacitor (Cb): 0.01F
The typical characteristics were obtained with using these test circuits.
Test Circuit 1: Typical Characteristics (1)-(5)
Test Circuit 2: Typical Characteristics (8)-(10)
Test Circuit 3: Typical Characteristics (11)-(14)
Test Circuit 4: Typical Characteristics (6), (7)
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TYPICAL CHARACTERISTICS
RN5RKxx1A/B
1) Output Voltage vs. Output Current (Topt=25°C)
RN5RK301A RN5RK301A
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
Output Current
IOUT(mA)
Output Voltage
VOUT(V)
0 204060 16014080 100 120
L=100μH
1.0V 1.3V
1.5V
2.0V
V
IN
=0.9V
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
Output Current
IOUT(mA)
Output Voltage
VOUT(V)
0 204060 16014080 100 120
L=220μH
1.0V 1.5V 2.0V
1.3V
V
IN
=0.9V
RN5RK301B RN5RK301B
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
Output Current
IOUT(mA)
Output Voltage
VOUT(V)
0 102030 5040
L=100μH
1.5V
2.0V
1.3V
V
IN
=1.0V
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
Output Current
I
OUT
(mA)
Output Voltage
VOUT(V)
0 102030 5040
L=220μH
1.5V 2.0V
1.3V
V
IN
=1.0V
RN5RK501A RN5RK501A
6
5
4
3
2
1
0
Output Current
I
OUT
(mA)
Output Voltage
VOUT(V)
0 50 100 150 200
L=100μH
1.5V
2.0V 3.0V
4.0V
V
IN
=0.9V
6
5
4
3
2
1
0
Output Current
IOUT(mA)
Output Voltage
VOUT(V)
0 50 100 150 200
L=220μH
1.5V 2.0V 3.0V
4.0V
V
IN
=0.9V
RN5RK
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RN5RK501B RN5RK501B
6
5
4
3
2
1
0
Output Current
IOUT(mA)
Output Voltage
VOUT(V)
0 50 100 150 200
L=100μH
2.0V 2.5V 3.0V
4.0V
V
IN
=1.5V
6
5
4
3
2
1
0
Output Current
IOUT(mA)
Output Voltage
VOUT(V)
0 50 100 150 200
L=220μH
2.0V 2.5V 3.0V
4.0V
V
IN
=1.5V
2) Efficiency vs. Output Current (Topt25°C)
RN5RK301A RN5RK301A
100
90
80
70
60
50
40
Output Current
IOUT(mA)
Efficiency
η(%)
0 20 40 60 16014080 100 120
L=100μH
1.0V
2.0V
V
IN
=0.9V 1.3V
1.5V
100
90
80
70
60
50
40
Output Current
IOUT(mA)
Efficiency
η(%)
0 20 40 60 16014080 100 120
L=220μH
1.0V 2.0V
V
IN
=0.9V1.3V
1.5V
RN5RK301B RN5RK301B
100
90
80
70
60
50
40
Output Current
IOUT(mA)
Efficiency
η(%)
0 102030 5040
L=100μH
1.5V 2.0V
1.3V
V
IN
=1.0V
100
90
80
70
60
50
Output Current
IOUT(mA)
Efficiency
η(%)
0 102030 5040
L=220μH
2.0V1.5V1.3V
VIN=1.0V
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RN5RK501A RN5RK501A
100
90
80
70
60
50
40
Output Current
I
OUT
(mA)
Efficiency
η(%)
0 50 100 150 200
L=100μH
1.5V
2.0V 3.0V
4.0V
VIN=0.9V
100
90
80
70
60
50
40
Output Current
I
OUT
(mA)
Efficiency
η(%)
0 50 100 150 200
L=220μH
1.5V
2.0V
3.0V
4.0V
V
IN
=0.9V
RN5RK501B RN5RK501B
100
90
80
70
60
50
40
Output Current
I
OUT
(mA)
Efficiency
η(%)
0 50 100 150 200
L=100μH
2.0V 2.5V
VIN=1.5V
4.0V
3.0V
100
90
80
70
60
50
40
Output Current
I
OUT
(mA)
Efficiency
η(%)
0 50 100 150 200
L=220μH
2.0V 2.5V
V
IN
=1.5V
4.0V
3.0V
3) Ripple Voltage vs. Output Current (Topt25°C)
RN5RK301A RN5RK301A
140
120
100
80
60
40
20
0
Output Current
I
OUT
(mA)
Ripple Voltage
Vr(mVp-p)
0 20 40 60 16014080 100 120
L=100 μH
1.5V
2.0V
V
IN
=0.9V
1.0V
1.3V
160
140
120
100
80
60
40
20
0
Output Current
I
OUT
(mA)
Ripple Voltage
Vr(mVp-p)
04020 8060 100 160140120
L=220μH
2.0V
V
IN
=0.9V
1.0V
1.3V 1.5V
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RN5RK301B RN5RK301B
45
40
35
30
25
20
15
10
5
0
Output Current
IOUT(mA)
Ripple Voltage
Vr(mVp-p)
0 102030 5040
L=100μH
2.0V
V
IN
=1.0V
1.3V
1.5V
45
40
35
30
25
20
15
10
5
0
Output Current
IOUT(mA)
Ripple Voltage
Vr(mVp-p)
0 102030 5040
L=220μH
2.0V
1.3V1.0V
1.5V
RN5RK501A RN5RK501A
200
150
100
50
0
Output Current
I
OUT
(mA)
Ripple Voltage
Vr(mVp-p)
0 50 100 150 200
L=100μH
2.0V 4.0V
3.0V
1.5V
VIN=0.9V
200
150
100
50
0
Output Current
I
OUT
(mA)
Ripple Voltage
Vr(mVp-p)
0 50 100 150 200
L=220μH
2.0V 4.0V
3.0V
1.5V
VIN=0.9V
RN5RK501B RN5RK501B
140
120
100
80
60
40
20
0
Output Current
I
OUT
(mA)
Ripple Voltage
Vr(mVp-p)
0 50 100 150 200
L=100μH
4.0V
2.0V
3.0V
2.5V
VIN=1.5V
140
120
100
80
60
40
20
0
Output Current
I
OUT
(mA)
Ripple Voltage
Vr(mVp-p)
0 50 100 150 200
L=220μH
4.0V
3.0V
2.5V
VIN=1.5V
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4) Start-up/Hold-on Voltage vs. Output Current (Topt25C)
RN5RK301A RN5RK501A
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
Output Current
I
OUT
(mA)
Start-up/Hold-on V oltage
Vstart/Vhold(V)
015105
L=100μH
Vstart
Vhold
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
Output Current
IOUT(mA)
Start-up/Hold-on V oltage
Vstart/Vhold(V)
015105
L=100μH
Vhold
Vstart
RN5RK301B RN5RK501B
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
Output Current
IOUT(mA)
Start-up/Hold-on V oltage
Vstart/Vhold(V)
015105
L=100μH
Vstart
Vhold
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
Output Current
I
OUT
(mA)
Start-up/Hold-on V oltage
Vstart/Vhold(V)
015105
L=100μH
Vstart
Vhold
5) Output Voltage vs. Temperature
RN5RK301A RN5RK501A
3.10
3.05
3.00
2.95
2.90
Temperature Topt( )
Output Voltage
V
OUT
(V)
-50 -25 1007502550
V
IN
=1.5V,L=100μH
I
OUT
=0
m
A
I
OUT
=10
m
A
I
OUT
=30
m
A
5.10
5.05
5.00
4.95
4.90
Temperature Topt( )
Output Voltage
VOUT(V)
-50 -25 1007502550
V
IN
=3.0V,L=100μH
I
OUT
=30
m
A
I
OUT
=0
m
A
I
OUT
=10
m
A
RN5RK
NO.EA-045-181012
16
6) Start-up Voltage vs. Temperature
RN5RK501A RN5RK501B
1
0.8
0.6
0.4
0
0.2
Temperature Topt( )
Start-up Voltage
Vstart(V)
-50 -25 1007502550
L=100 μH
1
0.8
0.6
0.4
0
0.2
Temperature Topt( )
Start-up Voltage
Vstart(V)
-50 -25 1007502550
L=100μH
7) Hold-on Voltage vs. Temperature
RN5RK501A RN5RK501B
1
0.8
0.6
0.4
0
0.2
Temperature Topt( )
Hold-on Voltage
Vhold(V)
-50 -25 1007502550
L=100μH
1
0.8
0.6
0.4
0
0.2
Temperature Topt( )
Hold-on Voltage
Vhold(V)
-50 -25 1007502550
L=100μH
8) Lx Switching Current vs. Temperature
RN5RK301A RN5RK501A
500
400
300
200
0
100
Temperature Topt( )
Lx
Switching Current
ILx(mA)
-50 -25 1007502550
500
400
300
200
0
100
Temperature Topt( )
Lx
Switching Current
ILx(mA)
-50 -25 1007502550
RN5RK
NO.EA-045-181012
17
9) Supply Current 1 vs. Temperature
RN5RK301A RN5RK501A
50
40
30
20
10
Temperature Topt( )
Supply Current
1 IDD1(
μ
A)
-50 -25 1007502550
80
70
60
50
30
40
Temperature Topt( )
Supply Current
1 IDD1(
μ
A)
-50 -25 1007502550
10) Supply Current 2 vs. Temperature 11) Standby Current 3 vs. Temperature
RN5RK301A RN5RK301A
5
4
3
2
0
1
Temperature Topt( )
Supply Current
2 I
DD2
(
μ
A)
-50 -25 1007502550
1
0.8
0.6
0.4
0
0.2
Temperature Topt( )
Supply Current
3 Istandby(
μ
A)
-50 -25 1007502550
12) Oscillator Duty Cycle vs. Temperature
RN5RK301A RN5RK301B
85
80
75
70
Temperature Topt( )
Oscullator Duty Cycle
Maxduty(
%
)
-50 -25 1007502550
60
58
56
54
50
52
Temperature Topt( )
Oscullator Duty Cycle
Maxduty(
%
)
-50 -25 1007502550
RN5RK
NO.EA-045-181012
18
13) CE “H” Input Voltage vs. Temperature 14) CE “L” Input Voltage vs. Temperature
RN5RK301A RN5RK301A
1
0.8
0.6
0.4
0
0.2
Temperature Topt( )
CE H
Input Voltage
VCEH(
V
)
-50 -25 1007502550
1
0.8
0.6
0.4
0
0.2
Temperature Topt( )
CE L
Input Voltage
VCEL(
V
)
-50 -25 1007502550
15) Maximum Oscillator Frequency vs. Temperature 16) VLX Voltage Limit vs. Temperature
RN5RK301A RN5RK301A
120
110
100
90
80
70
60
50
Temperature Topt( )
Maximum Oscillator Frequency f
OSC
(kHz)
-50 -25 1007502550
0.8
0.7
0.6
0.5
0.4
Temperature Topt( )
V
Lx
Voltage Limit
V
Lx
(V)
-50 -25 1007502550
RN5RK
NO.EA-045-181012
19
RN5RKxx2A
1) Output Voltage vs. Output Current (Topt=25°C)
RN5RK302A RN5RK502A
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
Output Current
I
OUT
(mA)
Output Voltage
VOUT(V)
0 200 400 600 800
L=27μH
2.0V
1.0V
1.5V
1.3V
VIN=0.9V
6.0
5.0
4.0
3.0
2.0
1.0
0.0
Output Current
I
OUT
(mA)
Output Voltage
VOUT(V)
0 200 400 600 800
L=27μH
1.5V
2.0V 3.0V
VIN=1.0V
2) Efficiency vs. Output Current (Topt=25°C)
RN5RK302A RN5RK502A
100
90
80
70
60
50
40
Output Current
IOUT(mA)
Efficiency
η(%)
0 200 400 600 800
L=27μH
1.0V
2.0V
V
IN
=0.9V 1.3V 1.5V
100
90
80
70
60
50
30
40
Output Current
I
OUT
(mA)
Efficiency
η(%)
0 200 400 600 800
L=27μH
3.0V
1.5V
2.0V
V
IN
=1.0V
3) Ripple Voltage vs. Output Current (Topt=25°C)
RN5RK302A RN5RK502A
250
200
150
100
50
0
Output Current
I
OUT
(mA)
Ripple Voltage
Vr(mVp-p)
0 200 400 600 800
L=27μH
2.0V
1.5V
1.3V
1.0V
VIN=0.9V
300
250
200
150
100
50
0
Output Current
I
OUT
(mA)
Ripple Voltage
Vr(mVp-p)
0 200 400 600 800
L=27μH
3.0V
2.0V
1.5V
VIN=1.0V
RN5RK
NO.EA-045-181012
20
4) Start-up/Hold-on Voltage vs. Output Current (Topt=25°C)
RN5RK302A RN5RK502A
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
Output Current
IOUT(mA)
Start-up/Hold-on V oltage
Vstart/Vhold(V)
0 20015010050
L=27μH
Vhold
Vstart
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.4
0.2
0.6
0.0
Output Current
IOUT(mA)
Start-up/Hold-on V oltage
Vstart/Vhold(V)
0 20015010050
L=27μH
Vstart,Vhold
5) Output Voltage vs. Temperature
RN5RK302A RN5RK502A
3.10
3.00
2.90
3.05
2.95
2.85
2.80
Temperature Topt( )
Output Voltage
VOUT(V)
-50 -25 1007502550
V
IN
=1.2V,L=27μH
I
OUT
=0
m
A
I
OUT
=50
m
A
I
OUT
=100
m
A
5.10
5.00
5.05
4.95
4.90
Temperature Topt( )
Output Voltage
VOUT(V)
-50 -25 1007502550
VIN=3.0V,L=27μH
IOUT=0mA
IOUT=50mA
IOUT=100mA
6) EXT “H” Output Current vs. Temperature
RN5RK302A RN5RK502A
10
9
8
7
6
5
4
0
3
2
1
Temperature Topt( )
EXT H
Output Current
I
EXTH
(mA)
-50 -25 1007502550
10
9
8
7
6
5
4
0
3
2
1
Temperature Topt( )
EXT H
Output Current
I
EXTH
(mA)
-50 -25 1007502550
RN5RK
NO.EA-045-181012
21
7) EXT “L” Output Current vs. Temperature
RN5RK302A RN5RK502A
20
18
16
14
12
10
8
0
6
4
2
Temperature Topt( )
EXT L
Output Current
IEXTL(mA)
-50 -25 1007502550
20
18
16
14
12
10
8
0
6
4
2
Temperature Topt( )
EXT L
Output Current
IEXTL(mA)
-50 -25 1007502550
8) Supply Current 1 vs. Temperature
RN5RK302A RN5RK502A
50
40
30
20
0
10
Temperature Topt( )
Supply Current
1 I
DD1
(
μ
A)
-50 -25 1007502550
50
40
30
20
0
10
Temperature Topt( )
Supply Current
1 I
DD1
(
μ
A)
-50 -25 1007502550
9) Supply Current 2 vs. Temperature 10) Standby Current vs. Temperature
RN5RK302A RN5RK302A
5
4
3
2
0
1
Temperature Topt( )
Supply Current
2 I
DD2
(
μ
A)
-50 -25 1007502550
1
0.8
0.6
0.4
0
0.2
Temperature Topt( )
Supply Current
3 Istandby(
μ
A)
-50 -25 1007502550
RN5RK
NO.EA-045-181012
22
11) Oscillator Duty Cycle vs. Temperature 12) Maximum Oscillator Frequency vs. Temperature
RN5RK302A RN5RK302A
85
80
75
70
Temperature Topt( )
Oscullator Duty Cycle
Maxduty(
%
)
-50 -25 1007502550
120
110
100
90
80
70
60
50
Temperature Topt( )
Maximum Oscillator Frequency
f
OSC
(kHz)
-50 -25 1007502550
13) CE “H” Input Voltage vs. Temperature 14) CE “L” Input Voltage vs. Temperature
RN5RK302A RN5RK302A
1
0.8
0.6
0.4
0
0.2
Temperature Topt( )
CE H
Input Voltage
V
CEH
(
V
)
-50 -25 1007502550
1
0.8
0.6
0.4
0
0.2
Temperature Topt( )
CE L
Input Voltage
V
CEL
(
V
)
-50 -25 1007502550
Ricoh is committed to reducing the environmental loading materials in electrical devices
with a view to contributing to the protection of human health and the environment.
Ricoh has been providing RoHS compliant products since April 1, 2006 and Halogen-free products since
April 1, 2012.
Halogen Free
https://www.e-devices.ricoh.co.jp/en/
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RicohElectronicDevicesCo.,Ltd.
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1.Theproducts and theproduct specifications describedinthis documentaresubject to changeor discontinuation of
productionwithoutnotice for reasons
suchasimprovement. Therefore, before decidingtousethe products, please
refertoRicohsalesrepresentativesforthelatestinformationthereon.
2.Thematerials in this documentmaynot be copiedorotherwise reproduced in wholeorin part withoutpriorwritten
consentofRicoh.
3.Please be sure to take any necessary formalities under relevant laws or regulations before exporting or otherwise
takingoutofyourcountrytheproductsorthetechnicalinformationdescribedherein.
4.Thetechnicalinformationdescribedinthisdocumentshowstypicalcharacteristicsofandexampleapplicationcircuits
fortheproducts.Thereleaseofsuchinformationisnottobeconstruedasawarrantyoforagrantoflicenseunder
Ricoh'soranythirdparty'sintellectualpropertyrightsoranyotherrights.
5.Theproductslistedinthisdocumentareintendedanddesignedforuseasgeneralelectroniccomponentsinstandard
applications (office equipment, telecommunication equipment, measuring instruments, consumer electronic products,
amusementequipment etc.). Thosecustomers intending touse a productinan applicationrequiringextreme quality
andreliability,forexample,inahighlyspecificapplicationwherethefailureormisoperationoftheproductcouldresult
inhumaninjuryordeath(aircraft,spacevehicle,nuclearreactorcontrolsystem,trafficcontrolsystem,automotiveand
transportationequipment,combustionequipment,safetydevices,lifesupportsystemetc.)shouldfirstcontactus.
6.Wearemakingourcontinuousefforttoimprovethequalityandreliabilityofourproducts,butsemiconductorproducts
arelikelytofailwithcertainprobability.Inordertopreventanyinjurytopersonsordamagestopropertyresultingfrom
suchfailure,customersshouldbecarefulenoughtoincorporatesafetymeasuresintheirdesign,suchasredundancy
feature,firecontainmentfeatureandfail-safefeature.Wedonotassumeanyliability
orresponsibilityforanylossor
damagearisingfrommisuseorinappropriateuseoftheproducts.
7.Anti-radiationdesignisnotimplementedintheproductsdescribedinthisdocument.
8.The X-ray exposure can influence functions and characteristics of the products. Confirm the product functions and
characteristicsintheevaluationstage.
9.WLCSP products should be used in light shielded environments. The light exposure can influence functions and
characteristicsoftheproductsunderoperationorstorage.
10.There can be variation in the marking when different AOI (Automated Optical Inspection) equipment is used. In the
caseofrecognizingthemarkingcharacteristicwithAOI,pleasecontactRicohsalesorourdistributorbeforeattempting
touseAOI.
11.
PleasecontactRicohsalesrepresentativesshouldyouhaveanyquestionsorcommentsconcerningtheproductsor
thetechnicalinformation.