RP108J Series
Low Input Voltage 3A LDO Regulator
NO.EA-203-150817
1
OUTLINE
The RP108J is a CMOS-based voltage regulator IC featuring 3A output with low ON-resistance.
The RP108J consists of a voltage reference unit, an error amplifier, resistor-net for voltage setting, a fold-back
protection circuit, and a thermal shutdown circuit. The RP108J features both low supply current and high output
current, and the dropout voltage is much smaller than bi-polar's. The minimum input voltage is as low as 1.6V
and the output voltage can be set from 0.8V, therefore it can be connected with the DC/DC converter as the latter
power supply for high density LSI that is operated by low output voltage.
The output voltage of RP108J081x is externally adjustable by using external divide resistors. The CE pin of the
RP108J can switch the regulator to standby mode. In addition to a fold-back protection circuit, which is already
built in the conventional regulators, The RP108J contains a thermal shutdown circuit, a constant slope circuit as
a soft-start function and a reverse current protection circuit. Ceramic capacitors can be used.
FEATURES
• Output Current ............................................................. Min. 3A
• Supply Current ............................................................. Typ. 350µA
• Standby Current ........................................................... Typ. 2µA
• Input Voltage Range .................................................... 1.6V to 5.25V
• Output Voltage Range .................................................. Fixed Output Voltage Type: 0.8V to 4.2V (0.1V steps)
* Refer to MARK INFORMATIONS for other voltages.
Adjustable Output Voltage Type: 0.8V to 4.2V
• Output Voltage Accuracy .............................................. ±1.0% (±15mV accuracy, When VSET ≤ 1.5V)
• Output Voltage Temperature-drift Coefficient ........... Typ. ±100ppm/°C
• Ripple Rejection ........................................................... Typ. 65dB (f = 1kHz, VSET = 2.8V)
• Dropout Voltage ........................................................... Typ. 0.51V (VSET=2.8V)
• Line Regulation ............................................................ Typ. 0.1%/V
• Package ....................................................................... TO-252-5-P2
• Built-in Fold-back Protection Circuit ............................. Typ. 220mA
• Built-in Thermal Shutdown Circuit ................................ Stops at 165°C
• Built-in Constant Slope Circuit
• Built-in Reverse Current Protection Circuit
• Ceramic capacitors are recommended to be used with this IC ···· 10µF or more
APPLICATIONS
• Power source for battery-powered equipments.
• Power source for portable communication equipments such as cameras and VCRs.
• Power source for electrical home appliances.
RP108J
NO.EA-203-150817
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BLOCK DIAGRAMS
RP108Jxx1B/E RP108Jxx1D/F
V
DD
GND
V
OUT
CE
Vref
V
FB
Reverse Detecter
V
DD
GND
V
OUT
CE
Vref
Current Limit
Thermal Shutdown
V
FB
Reverse Detecter
SELECTION GUIDE
The output voltage, auto discharge function, and the soft-start time for the ICs can be selected at the user’s
request.
Product Name
Package
Quantity per Reel
Pb Free
Halogen Free
RP108Jxx1∗(y) -T1-FE TO-252-5-P2 3,000 pcs Yes Yes
xx: The set output voltage (VSET) can be designated in the range of 0.8V(08) to 4.2V(42) in 0.1V steps.
y: If the output voltage includes the 3rd digit, indicate the digit of 0.01V.
(1.25V, 1.85V, 2.85V)
Ex. If the output voltage is 1.25V, RP108J121∗5-T1-FE.
If the output voltage is 1.85V, RP108J181∗5-T1-FE.
If the output voltage is 2.85V, RP108J281∗5-T1-FE.
∗: Designation of auto-discharge function at off state and the soft-start time
(B) No auto-discharge function, soft start time typ. 180 μs
(D) Auto-discharge function, soft start time typ. 180 μs
(E) No auto-discharge function, soft start time typ. 570 μs
(F) Auto-discharge function, soft start time typ. 570 μs
.
Auto-discharge function quickly lowers the output voltage to 0V, when the chip enable signal is switched from the active
mode to the standby mode, by releasing the electrical charge accumulated in the external capacitor.
Refer to CONSTANT SLOPE CIRCUIT for detailed information on the difference of soft-start time and its effect.
RP108J
NO.EA-203-150817
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PIN DESCRIPTIONS
TO-252-5-P2
1
2
3
4
5
∗
TO-252-5-P2
Pin No.
Symbol
Description
1
CE
Chip Enable Pin ("H" Active)
2
V
DD
Input Pin
3
GND
Ground Pin
4
VOUT
Output Pin
5
V
FB
Feedback Pin
*1 The tab on the bottom of the package enhances thermal performance and is electrically connected to GND
(substrate level). It is recommended that the tab be connected to the ground plane on the board, or otherwise
be left floating.
The VOUT pin should be connected to the VFB pin when using RP108J as an internal fixed output voltage type.
In case of using RP108J as an external adjustable type, please refer to "Adjustable Output Voltage Type
Settings".
RP108J
NO.EA-203-150817
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ABSOLUTE MAXIMUM RATINGS
Symbol
Item
Rating
Unit
V
IN
Input Voltage
6.0
V
V
CE
Input Voltage (CE Input Pin)
−
0.3 to 6.0
V
V
FB
Input Voltage (V
FB
Pin)
−
0.3 to 6.0
V
V
OUT
Output Voltage
−
0.3 to V
IN+
0.3
V
PD Power Dissipation (TO-252-5-
P2)*1
High Wattage Land Pattern
3800
mV
Standard Land Pattern
1900
Ta
Operating Temperature
−
40 to 85
°
C
Tstg
Storage Temperature
−
55 to 125
°
C
*1 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 are not assured.
RP108J
NO.EA-203-150817
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ELECTRICAL CHARACTERISTICS
VIN = VSET +1.0V, IOUT =1mA, CIN = COUT = 10μF, unless otherwise noted.
The specifications surrounded by are guaranteed by design engineering at - 40°C ≤ Ta ≤85°C.
RP108Jxx1B/D/E/F (Ta=25°C)
Symbol
Item Conditions Min. Typ. Max. Unit
VOUT Output Voltage
Ta = 25ºC
VSET > 1.5V ×0.99 ×1.01 V
VSET ≤ 1.5V -15 15 mV
-
40ºC ≤ Ta ≤ 85ºC
VSET > 1.5V ×0.97 ×1.02 V
VSET ≤ 1.5V -45
30 mV
ILIM Output Current Limit
3.0 A
∆VOUT/
∆IOUT Load regulation
1mA ≤ IOUT ≤ 300mA -15
2.0 20
mV
1mA ≤ IOUT ≤ 3000mA -70
3.0 50
VDIF Dropout Voltage Please refer to Dropout Voltage on the next page.
ISS Supply Current IOUT = 0mA 350 500
µA
Istandby Standby Current VCE = 0V 2.0 5.0 µA
∆V
OUT
/∆VIN
Line Regulation VSET +0.5V ≤ VIN ≤ 5.25V, IOUT=1mA
(When VSET ≤ 1.1V, VIN = 1.6V)
0.10 0.15 %/V
VIN
Input Voltage
∗1
1.6 5.25
V
RR Ripple Rejection
f = 1kHz,
Ripple 0.2Vp-p
IOUT =100mA
VSET ≤ 2.8V 65 dB
VSET > 2.8V 55 dB
∆V
OUT
/∆Ta
Output Voltage
Temperature Coefficient
-
40°C ≤ Ta ≤ 85ºC ±100
ppm
/ºC
ISC Short Current Limit VOUT = 0V 220 mA
IPD CE Pull-down Current
0.3 0.6 µA
VCEH CE Input Voltage "H"
1.0 V
VCEL CE Input Voltage "L"
0.4 V
en Output Noise BW = 10Hz to 100kHz 70 µVrms
TTSD
Thermal Shutdown
Temperature
Junction Temperature 165 ºC
TTSR
Thermal Shutdown
Released Temperature
Junction Temperature 95 ºC
RLOW
Auto-discharge
Nch Tr. ON Resistance
(D/F version)
VIN = 4.0V, VCE = 0V 30 Ω
IREV Reverse Current Limit VOUT > 0.5V, 0V ≤ VIN ≤ 5.25V 10 µA
All test items listed under Electrical C haracteristics are done under the pulse load condition (Tj ≈ Ta = 25ºC)
except Ripple Rejection, Output Voltage Temperature Coefficient, Output Noise and Thermal Shutdown.
∗1 The maximum input voltage listed under Electrical Characteristics is 5.25V. If for any reason the input voltage
exceeds 5.25V, it has to be no more than 5.5V with 500 cumulative operating hours.
RP108J
NO.EA-203-150817
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The specifications surrounded by are guaranteed by design engineering at - 40°C ≤ Ta ≤85°C.
Dropout Voltage by Output Voltage (Ta=25°C)
Output Voltage
VSET (V)
Dropout Voltage
VDIF (V)
Condition Typ. Max.
0.8 ≤ VSET < 0.9
IOUT=3000mA
0.910 1.110
0.9 ≤ VSET < 1.0 0.865 1.000
1.0 ≤ VSET < 1.1 0.810 0.950
1.1 ≤ VSET < 1.2 0.755 0.895
1.2 ≤ VSET < 1.5 0.720 0.840
1.5 ≤ VSET < 2.5 0.630 0.760
2.5 ≤ VSET < 3.3 0.510 0.600
3.3 ≤ VSET ≤ 4.2 0.480 0.560
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.
RP108J
NO.EA-203-150817
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TYPICAL APPLICATIONS
V
OUT
C1
RP108Jxx1x
V
DD
V
OUT
GND
C2
CE
V
FB
Typical Application
VOUT
C1
RP108J081x
VDD
VOUT
GND
C2
CE
VFB
R2
R1
Typical application for adjustable output voltage type
External Components
：
Symbol
Descriptions
C1, C2
10µF (Ceramic), CM21X7R106M06AB, KYOCERA
RP108J
NO.EA-203-150817
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TECHNICAL NOTES
When using the RP108J as an internally fixed output voltage type, please connect the VOUT pin to the VFB pin.
However, when using it as the Adjustable Output Voltage Type, The output voltage of the externally adjustable
output voltage type should be set to 4.2V or less. Also, total resistors value of R1 and R2 should be 20kΩ or less.
Phase Compensation
In the IC, phase compensation is made for securing stable operation even if the load current is varied. For this
purpose, use a 10μF or more capacitor C2.
In case of using a tantalum capacitor and its ESR is large, the output may be unstable. Therefore, select C2
carefully considering its frequency characteristics.
The recommended temperature characteristics for C1 and C2 capacitors are the followings.
⋅ B Characteristics: Temperature range from −25°C to 85°C, Capacitance change of ±10%
⋅ X5R Characteristics: Temperature range from −55°C to 85°C, Capacitance change of ±15%
⋅ X7R Characteristics: Temperature range from −55°C to 125°C, Capacitance change of ±15%
The recommended capacitor’s tolerable voltage is twice as large as the voltage of use (C1: Input voltage,
C2: Output voltage). The upper limit of the capacitance value for C2 is 100µF.
However, the increase of C2 leads to the increase of inrush current. Refer to CONSTANT SLOPE CIRCUIT for
detailed information.
PCB Layout
Make VDD and GND lines sufficient. If their impedance is high, noise pickup or unstable operation may result.
Connect a capacitor C1 with a capacitance value as much as 10μF or more between VDD and GND pin, and
as close as possible to the pins.
Set external components, especially the output capacitor C2, as close as possible to the ICs and make wiring
as short as possible.
Transient Response
When using the Adjustable Output Voltage Type, the transient response could be affected by the external
resistors. Evaluate the circuit taking the actual conditions of use into account.
RP108J
NO.EA-203-150817
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ADUSTABLE OUTPUT VOLTAGE TYPE SETTINGS
• Output Voltage Setting Method
RP108J081x can be adjusted the output voltage by using the external divider resistors.
If the VFB voltage fixed into the IC is described as SetVFB, the output voltage can be set by using the following
equations
SetVFB is equal to 0.8V. The VOUT pin of RP108J081x should be connected to the VFB pin.
GND
V
FB
R
IC
R2
I
IC
I1
I2
R1
SetV
FB
V
OUT
V
OUT
I1= IIC + I2 .................................................................................................................................. (1)
I2= SetVFB / R2 ......................................................................................................................... (2)
Thus,
I1= IIC + SetVFB /R2 .................................................................................................................... (3)
Therefore,
VOUT= SetVFB × R1 × I1 ............................................................................................................ (4)
Put Equation (3) into Equation (4), then
VOUT ........................................................................................................................................................ = SetVFB + R1(IIC + SetVFB / R2)
= SetVFB × (1+R1/ R2) + R1 × IIC ....................................................................................... (5)
In Equation (5), R1x IIC is the error-causing factor in VOUT.
As for IIC,
IIC= SetVFB / RIC ........................................................................................................................ (6)
Therefore, the error-causing factor R1x IIC can be described as follows.
R1×IIC .................................................................................................................................................................................... = R1 × SetVFB / RIC
= SetVFB × R1 / RIC ......................................................................................................... (7)
For better accuracy, choosing R1 (<<RIC) reduces this error.
Without the error-causing factor R1x IIC, the output voltage can be calculated by the following equation
VOUT = SetVFB × ((R1 + R2) / R2) ............................................................................................. (8)
RIC of RP108J is approximately Typ.1.6MΩ (Ta=25°C, this value is guaranteed by design.).
The value could be affected by the temperature, therefore evaluate the circuit taking the actual conditions of
use into account.
RP108J
NO.EA-203-150817
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REVERSE CURRENT PROTECTION CIRCUIT
The RP108J includes a Reverse Current Protection Circuit, which stops the reverse current from VOUT pin to
VDD pin or to GND pin when VOUT becomes higher than VIN.
Usually, the LDO using Pch output transistor contains a parasitic diode between VDD pin and VOUT pin.
Therefore, if VOUT is higher than VIN, the parasitic diode becomes forward direction. As a result, the current flows
from VOUT pin to VDD pin.
The RP108J switches the mode to the reverse current protection mode before VIN becomes lower than VOUT
by connecting the parasitic diode of Pch output transistor to the backward direction, and connecting the gate to
VOUT pin. As a result, the Pch output transistor is turned off and the all the current pathways from VOUT pin to GND
pin are shut down to maintain the reverse current lower than 10µA.
Switching to either the normal mode or to the reverse current protection mode is determined by the magnitude
of VIN voltage and VOUT voltage. For the stable operation, offset and hysteresis are set as the threshold. Offset is
set to 30mV (Typ.25°C) and hysteresis is set to 5mV (Typ.25°C).
Therefore, the minimum dropout voltage under the small load current condition is restricted by the value of
35mV (Typ.25°C).
Fig.1 and Fig.2 show the diagrams of each mode, and Fig.3 shows the load characteristics of each mode.
When giving the VOUT pin a constant-voltage and decreasing the VIN voltage, the dropout voltage will become
lower than 30mV (Typ.25°C). As a result, the reverse current protection starts to function to stop the load current.
By increasing the dropout voltage higher than 35mV (Typ.25°C), the protection mode will be released to let the
load current to flow. If the dropout voltage to be used is lower than 30mV (Typ.25°C), the detection and the
release may be repeated.
V
DD
GND
V
OUT
CE
Vref
I
OUT
Reverse
Detector
V
DD
GND
V
OUT
CE
Vref
I
REV
Reverse
Detector
Fig.1 Normal Mode Fig.2 Reverse Current Protection Mode
Fig. 3 Reverse Current Protection Mode Detection/ Release &
Output/Reverse Current Input/Output Voltage
V
REV_DET
V
REV_REL
V
OUT
V
IN
0
Reverse Current Protection ModeNormal Mode Normal Mode
V
IN
/V
OUT
[V]I
OUT
/I
REV
I
OUT
I
REV
Reverse Current/ Output Current Characteristics
35mV
30mV
RP108J
NO.EA-203-150817
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CONSTANT SLOPE CIRCUIT (RP108Jxx1B/xx1D)
RP108Jxx1B/xx1D has a Constant Slope Circuit (soft-start circuit) which allows the output voltage to start-up
gradually. The capacitor to create the start-up slope is built-in the IC so that it does not require any external
components. The upper limit of inrush current during the start-up is controlled by the short current ISC and the
output current limit ILIM.
In the following characteristics COUT = 10 µF (RLOAD = 380Ω), the inrush current IRUSH is not controlled by the
short current ISC and the output current limit ILIM. Therefore the output voltage rises with the soft-start time
(TSLOPE) set inside IC, and it enables to control the overshoot of the output voltage and the inrush current. TSLOPE
is typ. 180 µs.
In the characteristics COUT = 20 µF, IRUSH at the low output voltage is controlled by the short current ISC. After
the current is released from ISC, the output voltage rises with the soft-start time (TSLOPE).
In the characteristics COUT = 100 µF, IRUSH at the low output voltage is controlled by the short current ISC.
After the current is released from ISC, it is controlled by the output current limit. The output voltage rises with
the soft-start time (TSLOPE) or longer.
The relation of the inrush current and the constant slope depends on the output voltage since the inrush
current is a sum of the charge current of COUT and the load current. Use RP108Jxx1E/xx1F to avoid an
influence on peripheral components due to the inrush current generated in the use environment conditions
(COUT and output voltage).
RP108J381B/D Inrush current characteristics
CIN=4.7
µ
F, COUT=10
µ
F, Topt
=
25
°
C, RLOAD=380Ω
CIN=4.7
µ
F, COUT=20
µ
F, Topt
=
25
°
C, RLOAD=380Ω CIN=4.7
µ
F, COUT=100
µ
F, Topt
=
25
°
C, RLOAD=380Ω
RP108J
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CONSTANT SLOPE CIRCUIT (RP108Jxx1E/xx1F)
RP108Jxx1E/xx1F has a constant slope circuit (soft-start circuit) which allows the output voltage to start-up
gradually. The capacitor to create the start-up slope is built-in the IC so that it does not require any external
components. The upper limit of inrush current during the start-up is controlled by the output current limit ILIM.
As shown in the following Foldback Characteristics, the inrush current is not controlled by the short current
ISC during the soft-start time at the start-up. Therefore the output voltage rises with the soft-start time (TSLOPE)
set inside IC, and it enables to control the overshoot of the output voltage and the inrush current. TSLOPE is typ.
570 µs (max. 900 µs/85°C). Use RP108Jxx1B/xx1D to avoid an influence on peripheral components due to the
output start-up time is slow in the system.
In the characteristics COUT = 20 µF, the inrush current is lower or equal to the output current limit ILIM. The
output voltage rises with the soft-start time (TSLOPE).
Similarly in the characteristics COUT = 100 µF, the inrush current is lower or equal to the output current limit
ILIM. The output voltage rises with the soft-start time (TSLOPE).
The relation of the inrush current and the constant slope depends on the output voltage since the inrush current
is a sum of the charge current of COUT and the load current.
RP108J381E/F Inrush current characteristics
Foldback Characteristics
(Diagrammatic sketch)
CIN=4.7
µ
F, COUT=20
µ
F, Topt
=
25
°
C, RLOAD=380Ω CIN=4.7
µ
F, COUT=100
µ
F, Topt
=
25
°
C, RLOAD=380Ω
RP108J
NO.EA-203-150817
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5000
4000
3000
2000
1000
0
85
1900
2350
Power Dissipation
PD (mW)
0 25
50 75 100 125 150
Ambient Temperature (°C)
Power Dissipation
On Board
On Board
(Ultra High Wattage Land Pattern)
3800
4800
PACKAGE INFORMATION
Power Dissipation (TO-252-5-P2)
Power Dissipation (PD) depends on conditions of mounting on board. This specification is based on the
Measurement Conditions below.
Measurement conditions
Ultra High Wattage Land Pattern Standard Land Pattern
Environment Mounting on board (Wind velocity 0m/s)
Board Material
Glass cloth epoxy plastic
(Four-layers)
Glass cloth epoxy plastic
(Double layers)
Board Dimensions 76.2mm x 114.3mm x 0.8mm 50mm x 50mm x 1.6mm
Copper Ratio
Top, Back side: 50mm Square, Approx.96%,
2
nd
, 3
rd
Layer: 50mm Square, Approx.100%
Top side: Approx. 50%,
Back side: Approx. 50%
Through - Hole φ 0.4mm x 30pcs φ 0.5mm x 24pcs
Measurement Results (Ta= 2 5°C, Tjmax=125°C)
Ultra High Wattage Land Pattern Standard Land Pattern
Power Dissipation 3800mW 1900mW
Thermal Resistance θja= (125-25°C)/3.8W = 26°C/W θ
ja=(125-25
°
C)/1.9W= 53
°
C/W
θjc= 7°C/W θjc= 17°C/W
Measurement Board Pattern
IC Mount Area (Unit: mm)
The above graph shows the Power Dissipation of the package based on Tjmax=125°C and
Tjmax=150°C. Operating the IC in the shaded area in the graph might have an influence its lifetime.
Operating time must be within the time limit described in the table below, in case of operating in the
shaded area.
Operating Time
Estimated years
(Operating 4 hours/day)
13,000 hours 9 years
50
50
Standard
76.2
40
114.3
50
50
Ultra High Wattage
RP108J
NO.EA-203-150817
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• PACKAGE DIMENSIONS (TO-252-5-P2)
• MARK SPECIFICATION (TO-252-5-P2)
(Unit: mm)
0.50±0.10
0.50±0.10
(0°～8°)
1.52
+0.26
-0.13
(0～0.127)
S
0.12
M
0.50±0.10
2.30±0.20
(1.00)
0.10
(6.20)
6.60±0.20
5.34±0.20
6.10±0.20
(1.00)
9.90±0.30
1.10±0.20
C0.60
1.27
2.70±0.20
(4.06)
(3.56)
R0.325
R0.225
(4.19)
(1.50)
(5.04)
15
＊
①②③④⑤⑥
⑦⑧ ⑨⑩
: Product Code…Refer to M ARK SPE CIFICATION TABLE
: Lot Number … Alphanumeric Serial Number
＊）The tab on the bottom of the package
enhances thermal performance and is
electrically connected to GND (substrate
level). It is recommended that the tab be
connected to the ground plane on the
board, or otherwise be left floating.
RP108J
NO.EA-203-150817
15
RP108J Mark Specification Table (TO-252-5-P2)
RP108Jxx1B RP108Jxx1D
Part Number

V
SET
Part Number

V
SET
RP108J081B
E 1 J 0 8 1 B
0.8V
RP108J081D
E 1 J 0 8 1 D
0.8V
RP108J091B
E 1 J 0 9 1 B
0.9V
RP108J091D
E 1 J 0 9 1 D
0.9V
RP108J101B
E 1 J 1 0 1 B
1.0V
RP108J101D
E 1 J 1 0 1 D
1.0V
RP108J111B
E 1 J 1 1 1 B
1.1V
RP108J111D
E 1 J 1 1 1 D
1.1V
RP108J121B
E 1 J 1 2 1 B
1.2V
RP108J121D
E 1 J 1 2 1 D
1.2V
RP108J131B
E 1 J 1 3 1 B
1.3V
RP108J131D
E 1 J 1 3 1 D
1.3V
RP108J141B
E 1 J 1 4 1 B
1.4V
RP108J141D
E 1 J 1 4 1 D
1.4V
RP108J151B
E 1 J 1 5 1 B
1.5V
RP108J151D
E 1 J 1 5 1 D
1.5V
RP108J161B
E 1 J 1 6 1 B
1.6V
RP108J161D
E 1 J 1 6 1 D
1.6V
RP108J171B
E 1 J 1 7 1 B
1.7V
RP108J171D
E 1 J 1 7 1 D
1.7V
RP108J181B
E 1 J 1 8 1 B
1.8V
RP108J181D
E 1 J 1 8 1 D
1.8V
RP108J191B
E 1 J 1 9 1 B
1.9V
RP108J191D
E 1 J 1 9 1 D
1.9V
RP108J201B
E 1 J 2 0 1 B
2.0V
RP108J201D
E 1 J 2 0 1 D
2.0V
RP108J211B
E 1 J 2 1 1 B
2.1V
RP108J211D
E 1 J 2 1 1 D
2.1V
RP108J221B
E 1 J 2 2 1 B
2.2V
RP108J221D
E 1 J 2 2 1 D
2.2V
RP108J231B
E 1 J 2 3 1 B
2.3V RP108J231D
E 1 J 2 3 1 D
2.3V
RP108J241B
E 1 J 2 4 1 B
2.4V
RP108J241D
E 1 J 2 4 1 D
2.4V
RP108J251B
E 1 J 2 5 1 B
2.5V
RP108J251D
E 1 J 2 5 1 D
2.5V
RP108J261B
E 1 J 2 6 1 B
2.6V
RP108J261D
E 1 J 2 6 1 D
2.6V
RP108J271B
E 1 J 2 7 1 B
2.7V
RP108J271D
E 1 J 2 7 1 D
2.7V
RP108J281B
E 1 J 2 8 1 B
2.8V
RP108J281D
E 1 J 2 8 1 D
2.8V
RP108J291B
E 1 J 2 9 1 B
2.9V
RP108J291D
E 1 J 2 9 1 D
2.9V
RP108J301B
E 1 J 3 0 1 B
3.0V
RP108J301D
E 1 J 3 0 1 D
3.0V
RP108J311B
E 1 J 3 1 1 B
3.1V
RP108J311D
E 1 J 3 1 1 D
3.1V
RP108J321B
E 1 J 3 2 1 B
3.2V
RP108J321D
E 1 J 3 2 1 D
3.2V
RP108J331B
E 1 J 3 3 1 B
3.3V
RP108J331D
E 1 J 3 3 1 D
3.3V
RP108J341B
E 1 J 3 4 1 B
3.4V
RP108J341D
E 1 J 3 4 1 D
3.4V
RP108J351B
E 1 J 3 5 1 B
3.5V
RP108J351D
E 1 J 3 5 1 D
3.5V
RP108J361B
E 1 J 3 6 1 B
3.6V
RP108J361D
E 1 J 3 6 1 D
3.6V
RP108J371B
E 1 J 3 7 1 B
3.7V
RP108J371D
E 1 J 3 7 1 D
3.7V
RP108J381B
E 1 J 3 8 1 B
3.8V
RP108J381D
E 1 J 3 8 1 D
3.8V
RP108J391B
E 1 J 3 9 1 B
3.9V
RP108J391D
E 1 J 3 9 1 D
3.9V
RP108J401B
E 1 J 4 0 1 B
4.0V
RP108J401D
E 1 J 4 0 1 D
4.0V
RP108J411B
E 1 J 4 1 1 B
4.1V
RP108J411D
E 1 J 4 1 1 D
4.1V
RP108J421B
E 1 J 4 2 1 B
4.2V
RP108J421D
E 1 J 4 2 1 D
4.2V
RP108J121B5
E 1 J 1 2 1 B 5
1.25V
RP108J121D5
E 1 J 1 2 1 D 5
1.25V
RP108J181B5
E 1 J 1 8 1 B 5
1.85V
RP108J181D5
E 1 J 1 8 1 D 5
1.85V
RP108J281B5
E 1 J 2 8 1 B 5
2.85V
RP108J281D5
E 1 J 2 8 1 D 5
2.85V
RP108J
NO.EA-203-150817
16
RP108Jxx1E RP108Jxx1F
Part Number

VSET Part Number

VSET
RP108J081E
E 1 J 0 8 1 E
0.8V
RP108J081F
E 1 J 0 8 1 F
0.8V
RP108J091E
E 1 J 0 9 1 E
0.9V
RP108J091F
E 1 J 0 9 1 F
0.9V
RP108J101E
E 1 J 1 0 1 E
1.0V
RP108J101F
E 1 J 1 0 1 F
1.0V
RP108J111E
E 1 J 1 1 1 E
1.1V
RP108J111F
E 1 J 1 1 1 F
1.1V
RP108J121E
E 1 J 1 2 1 E
1.2V
RP108J121F
E 1 J 1 2 1 F
1.2V
RP108J131E
E 1 J 1 3 1 E
1.3V
RP108J131F
E 1 J 1 3 1 F
1.3V
RP108J141E
E 1 J 1 4 1 E
1.4V
RP108J141F
E 1 J 1 4 1 F
1.4V
RP108J151E
E 1 J 1 5 1 E
1.5V
RP108J151F
E 1 J 1 5 1 F
1.5V
RP108J161E
E 1 J 1 6 1 E
1.6V
RP108J161F
E 1 J 1 6 1 F
1.6V
RP108J171E
E 1 J 1 7 1 E
1.7V
RP108J171F
E 1 J 1 7 1 F
1.7V
RP108J181E
E 1 J 1 8 1 E
1.8V
RP108J181F
E 1 J 1 8 1 F
1.8V
RP108J191E
E 1 J 1 9 1 E
1.9V
RP108J191F
E 1 J 1 9 1 F
1.9V
RP108J201E
E 1 J 2 0 1 E
2.0V
RP108J201F
E 1 J 2 0 1 F
2.0V
RP108J211E
E 1 J 2 1 1 E
2.1V
RP108J211F
E 1 J 2 1 1 F
2.1V
RP108J221E
E 1 J 2 2 1 E
2.2V
RP108J221F
E 1 J 2 2 1 F
2.2V
RP108J231E
E 1 J 2 3 1 E
2.3V
RP108J231F
E 1 J 2 3 1 F
2.3V
RP108J241E
E 1 J 2 4 1 E
2.4V
RP108J241F
E 1 J 2 4 1 F
2.4V
RP108J251E
E 1 J 2 5 1 E
2.5V
RP108J251F
E 1 J 2 5 1 F
2.5V
RP108J261E
E 1 J 2 6 1 E
2.6V
RP108J261F
E 1 J 2 6 1 F
2.6V
RP108J271E
E 1 J 2 7 1 E
2.7V
RP108J271F
E 1 J 2 7 1 F
2.7V
RP108J281E
E 1 J 2 8 1 E
2.8V
RP108J281F
E 1 J 2 8 1 F
2.8V
RP108J291E
E 1 J 2 9 1 E
2.9V
RP108J291F
E 1 J 2 9 1 F
2.9V
RP108J301E
E 1 J 3 0 1 E
3.0V
RP108J301F
E 1 J 3 0 1 F
3.0V
RP108J311E
E 1 J 3 1 1 E
3.1V
RP108J311F
E 1 J 3 1 1 F
3.1V
RP108J321E
E 1 J 3 2 1 E
3.2V
RP108J321F
E 1 J 3 2 1 F
3.2V
RP108J331E
E 1 J 3 3 1 E
3.3V
RP108J331F
E 1 J 3 3 1 F
3.3V
RP108J341E
E 1 J 3 4 1 E
3.4V
RP108J341F
E 1 J 3 4 1 F
3.4V
RP108J351E
E 1 J 3 5 1 E
3.5V
RP108J351F
E 1 J 3 5 1 F
3.5V
RP108J361E
E 1 J 3 6 1 E
3.6V
RP108J361F
E 1 J 3 6 1 F
3.6V
RP108J371E
E 1 J 3 7 1 E
3.7V
RP108J371F
E 1 J 3 7 1 F
3.7V
RP108J381E
E 1 J 3 8 1 E
3.8V
RP108J381F
E 1 J 3 8 1 F
3.8V
RP108J391E
E 1 J 3 9 1 E
3.9V
RP108J391F
E 1 J 3 9 1 F
3.9V
RP108J401E
E 1 J 4 0 1 E
4.0V
RP108J401F
E 1 J 4 0 1 F
4.0V
RP108J411E
E 1 J 4 1 1 E
4.1V
RP108J411F
E 1 J 4 1 1 F
4.1V
RP108J421E
E 1 J 4 2 1 E
4.2V
RP108J421F
E 1 J 4 2 1 F
4.2V
RP108J121E5
E 1 J 1 2 1 E 5
1.25V
RP108J121F5
E 1 J 1 2 1 F 5
1.25V
RP108J181E5
E 1 J 1 8 1 E 5
1.85V
RP108J181F5
E 1 J 1 8 1 F 5
1.85V
RP108J281E5
E 1 J 2 8 1 E 5
2.85V
RP108J281F5
E 1 J 2 8 1 F 5
2.85V
RP108J
NO.EA-203-150817
17
TEST CIRCUITS
Fixed Output Voltage Type (RP108Jxx1x)
C1
RP108Jxx1x
V
DD
V
OUT
CE
GND
V
C2
V
OUT
I
OUT
C1=Ceramic 10µF
C2=Ceramic 10µF
V
FB
↓
Basic Test Circuit
V
OUT
C1
V
DD
V
OUT
CE
GND
C2
A
I
SS
RP108Jxx1x
C1=Ceramic 10µF
C2=Ceramic 10µF
V
FB
Test Circuit for Supply Current
V
OUT
C1
V
DD
V
OUT
CE
GND
C2
A
I
SS
RP108Jxx1x
C1=Ceramic 10µF
C2=Ceramic 10µF
V
FB
Test Circuit for Standby Current
RP108J
NO.EA-203-150817
18
Adjustable Output Voltage Setting Type (RP108J081x)
C1
RP132x
Series
VDD
VOUT
CE
GND
V
C2
VOUT
↓
IOUT
VDD
VOUT
CE
GND
RP108J081x
VFB
R2
R1
C1=Ceramic 10µF
C2=Ceramic 10µF
Basic Test Circuit
C1
VDD
VOUT
CE
GND
A
I
SS
V
OUT
RP132x
Series
R2
V
DD
V
OUT
CE
GND
RP108J081x
V
FB
C2
R1
C1=Ceramic 10µF
C2=Ceramic 10µF
Test Circuit for Supply Current
C1
V
DD
V
OUT
CE
GND
A
I
SS
V
OUT
RP132x
Series
R2
V
DD
V
OUT
CE
GND
RP108J081x
V
FB
C2
R1
C1=Ceramic 10µF
C2=Ceramic 10µF
Test Circuit for Standby Current
Note : Refer to Adjustable Output Voltage Type Settings for R1 and R2.
RP108J
NO.EA-203-150817
19
TYPICAL CHARACTERISTICS
Note: Typical Characteristics are intended to be used as reference data; they are not guaranteed.
1) Output Voltage vs. Input Voltage (C1=C2=Ceramic10
µ
F, Ta=25
°
C)
RP108J081x
RP108J151x
RP108J281x
RP108J421x
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
012345
Input Voltage VIN (V)
Output Voltage VOUT (V)
Iout=1mA
Iout=100mA
Iout=1A
0
0.3
0.6
0.9
1.2
1.5
1.8
0 1 2 3 4 5
Input Voltage VIN (V)
Output Voltage VOUT (V)
Iout=1mA
Iout=100mA
Iout=1A
0
0.4
0.8
1.2
1.6
2
2.4
2.8
3.2
0 1 2 3 4 5
Input Voltage VIN (V)
Output Voltage VOUT (V)
Iout=1mA
Iout=100mA
Iout=1A
0
0.7
1.4
2.1
2.8
3.5
4.2
4.9
5.6
0 1 2 3 4 5
Input Voltage VIN (V)
Output Voltage VOUT (V)
Iout=1mA
Iout=100mA
Iout=1A
RP108J
NO.EA-203-150817
20
2
）
Output Voltage vs. Temperature (C1=C2=Ceramic10
µ
F, -40
°
C ≤ Ta ≤ 85
°
C
）
RP108J081x
RP108J151x
RP108J281x
RP108J421x
3) Supply Current vs. Input Voltage (C1=C2=Ceramic 10
µ
F, IOUT=0
ｍ
A, Ta=25
°
C)
RP108J081x
RP108J151x
-40
-25
0
25
50
75
85
0.76
0.77
0.78
0.79
0.80
0.81
0.82
0.83
0.84
Temperature Ta (°C)
Output Voltage VOUT (V)
-40
-25
0
25
50
75
85
1.46
1.47
1.48
1.49
1.50
1.51
1.52
1.53
1.54
Temperature Ta (°C)
Output Voltage VOUT (V)
-40
-25
0
25
50
75
85
2.72
2.74
2.76
2.78
2.80
2.82
2.84
2.86
2.88
Temperature Ta (°C)
Output Voltage VOUT (V)
-40
-25
0
25
50
75
85
4.12
4.14
4.16
4.18
4.20
4.22
4.24
4.26
4.28
Temperature Ta (°C)
Output Voltage VOUT (V)
0
50
100
150
200
250
300
350
400
450
012345
Input Voltage VIN (V)
Supply Current ISS (μA)
0
50
100
150
200
250
300
350
400
450
012345
Input Voltage V
IN
(V)
Supply Current I
SS
(μA)
RP108J
NO.EA-203-150817
21
RP108J281x
RP108J421x
4) Short Current Limit vs. Temperature/ Current Limit vs. Temperature
RP108J includes a Fold-back Protection Circuit. Under conditions during a Fold-back Protection Circuit works,
Thermal Shutdown Circuit starts to operate in order to prevent the self-heat generation. Therefore, RP108J isn't
able to test "Output voltage vs. Output Current".
RP108J081x
RP108J081x
0
50
100
150
200
250
300
350
400
450
012345
Input Voltage V
IN
(V)
Supply Current I
SS
(μA)
0
50
100
150
200
250
300
350
400
450
012345
Input Voltage V
IN
(V)
Supply Current I
SS
(μA)
-40
-25
0
25
50
75
85
2000
2500
3000
3500
4000
4500
5000
Temperature Ta (°C)
Current Limit I
LIM
(mA)
-40
-25
0
25
50
75
85
200
220
240
260
280
300
Temperature Ta (°C)
Short Current Limit I
LIM
(mA)
RP108J
NO.EA-203-150817
22
5) Supply Current vs. Temperature (C1= C2=Ceramic 10
µ
F, I OUT=0mA)
RP108J081x
RP108J151x
6) Dropout Voltage vs. Output Current (C1=C2=Ceramic 10
µ
F)
RP108J251x
7) Dropout Voltage vs. Set Output Voltage (C1=C2=Ceramic 10
µ
F, Ta=25
°
C)
RP108J251x
-40
-25
0
25
50
75
85
300
310
320
330
340
350
360
370
380
390
400
Temperature Ta (°C)
Supply Current Iss (μA)
-40
-25
0
25
50
75
85
300
310
320
330
340
350
360
370
380
390
400
Temperature Ta (°C)
Supply Current Iss (μA)
0
100
200
300
400
500
600
700
0.0 0.5 1.0 1.5 2.0 2.5 3.0
Output Current IOUT (A)
Dropout Voltage VDIF (mV)
85℃
25℃
-40℃
0
0
100
200
300
400
500
600
700
800
900
0.5 1 1.5 2 2.5 3 3.5 4 4.5
Dropout Voltage [mV]
VSET [V]
300mA
3A
RP108J
NO.EA-203-150817
23
8) Ripple Rejection vs. Input Voltage (C1=C2=10
µ
F, Ripple=0.2Vp-p, IOUT=
100µΑ,
Ta=25
°
C)
RP108J081x
RP108J251x
RP108J421x
9) Ripple Rejection vs. Frequency (C1=none, C2=10
µ
F, IOUT=100mA, Ta=25
°
C)
RP108J081x
RP108J421x
0
10
20
30
40
50
60
70
80
90
100
1 2 3 4 5
Input Voltage V
IN
(V)
Ripple Rejection (dB)
0.1kHz
1kHz
10kHz
100kHz
0
10
20
30
40
50
60
70
80
90
100
2 3 4 5
Input Voltage V
IN
(V)
Ripple Rejection (dB)
0.1kHz
1kHz
10kHz
100kHz
0
10
20
30
40
50
60
70
80
90
100
4.00 4.25 4.50 4.75 5.00 5.25
Input Voltage V
IN
(V)
Ripple Rejection (dB)
0.1kHz
1kHz
10kHz
100kHz
0
20
40
60
80
100
120
0.1 110 100 1000
Frequancy f (kHz)
Ripple Rejection (dB)
VIN=1.8V,Ripple=0.2Vp-p
0
20
40
60
80
100
120
0.1 110 100 1000
Frequancy f (kHz)
Ripple Rejection (dB)
V
IN
=5.2V,Ripple=0.2Vp-p
RP108J
NO.EA-203-150817
24
10) Input Transient Response (C1=none, C2=10
µ
F, IOUT=30mA, tr=tf=5
µ
s, Ta=25
°
C)
RP108J081x
RP108J421x
11) Load Transient Response (C1=C2=10
µ
F, tr=tf=0.5
µ
s, Ta=25
°
C)
RP108J081x
RP108J081x
RP108J421x
RP108J421x
0.78
0.79
0.80
0.81
0.82
0.83
0.84
-20 -10 010 20 30 40 50 60 70 80
Time t (μs)
Output Voltage V
OUT
(V)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Input Voltage V
IN
(V)
Input Voltage
Output Voltage
4.16
4.17
4.18
4.19
4.20
4.21
4.22
-0.2 -0.1 00.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
Time t (ms)
Output Voltage V
OUT
(V)
0
1
2
3
4
5
6
Input Voltage V
IN
(V)
Input Voltage
Output Voltage
0.78
0.79
0.80
0.81
0.82
-40 -20 020 40 60 80 100 120 140 160
Time t (μs)
Output Voltage V
OUT
(V)
0
500
1000
Output Current I
OUT
(mA)
V
IN
=1.8V
Output Current
100mA ⇔ 500mA
Output Voltage
0.70
0.75
0.80
0.85
-0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
Time t ( ms )
Output Voltage V
OUT
(V)
0
3
6
Output Current I
OUT
(mA)
V
IN
=1.8V
Output Current
1mA ⇔ 3A
Output Voltage
0
4.16
4.17
4.18
4.19
-40 -20 020 40 60 80 100 120 140 160
Time t (μs)
Output Voltage V
OUT
(V)
0
500
1000
Output Curren I
OUT (mA)
V
IN
=5.25V
Output Current
100mA⇔500mA
Output Voltage
4.10
4.15
4.20
4.25
-0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
Time t ( ms )
Output Voltage V
OUT
(V)
0
3
6
Output Current I
OUT
(mA)
V
IN
=5.25V
Output Current
1mA ⇔3A
Output Voltage
0
RP108J
NO.EA-203-150817
25
12) Turn on Speed with CE pin (C1=C2=Ceramic 10
µ
F, Ta=25
°
C)
RP108J081B/D
RP108J151B/D
RP108J281B/D
RP108J421B/D
13) Turn off Speed with CE pin (C1=C2=Ceramic 10
µ
F, Ta=25
°
C)
RP108J081D/F
RP108J151D/F
RP108J
NO.EA-203-150817
26
RP108J281D/F
RP108J421D/F
14) Inrush Current
RP108J081B/D
RP108J421B/D
RP108J
NO.EA-203-150817
27
ESR vs. Output Current
When using the IC, consider the following points: The relations between IOUT (Output Current) and ESR of an
output capacitor are shown below. The conditions when the white noise level is under 40μV (Avg.) are marked
as the hatched area in the graph.
Measurement Conditions
Frequency Band : 10Hz to 2MHz
Temperature : −40°C to 85°C
Hatched area : Noise level is under 40µV
C1, C2 :10.0µF or more
RP108J081x
RP108J421x
0.01
0.1
1
10
100
01000 2000 3000
Output Current IOUT
( mA )
ESR (Ω)
85°C
-40°C
VIN=1.6V～5.25V
0.01
0.1
1
10
100
01000 2000 3000
Output Current I
OUT
(mA )
ESR (Ω)
85°C
-40°C
V
IN
=4.2V～5.25V
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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Room403,No.2Building,No.690BiboRoad,PuDongNewDistrict,Shanghai201203,
People'sRepublicofChina
Phone:+86-21-5027-3200Fax:+86-21-5027-3299
RicohElectronicDevicesShanghaiCo.,Ltd.
ShenzhenBranch
1205,BlockD(JinlongBuilding),Kingkey100,HongbaoRoad,LuohuDistrict,
Shenzhen,China
Phone:+86-755-8348-7600Ext225
RicohElectronicDevicesCo.,Ltd.
Taipeioffice
Room109,10F-1,No.51,HengyangRd.,TaipeiCity,Taiwan(R.O.C.)
Phone:+886-2-2313-1621/1622Fax:+886-2-2313-1623
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.