RP108J SERIES
Low Input Voltage 3A LDO Regulator
NO.EA-203-131022
1
OUTLINE
The RP108J Series are CMOS-based voltage regulator ICs featuring 3A output with low ON-resistance.
Each IC of this series consists of a voltage reference unit, an error amplifier, resistor-net for voltage setting, a
fold-back protection circuit, and a thermal shutdown circuit. This series 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 Series can switch the regulator to standby mode. In addition to a fold-back protection circuit, which
is already built in the conventional regulators, this series contain 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.................................................. 0.8V to 4.2V (0.1V steps)
(
For other voltages, please refer to MARK INFORMATIONS.)
• Output Voltage Accuracy.............................................. ±1.0% (±15mV accuracy, When VOUT ≤ 1.5V)
• Output Voltage Temperature-drift Coefficient ........... Typ. ±100ppm/°C
• Ripple Rejection........................................................... Typ. 65dB (f =1kHz, VOUT=2.8V)
• Dropout Voltage ........................................................... Typ. 0.51V (VOUT=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
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BLOCK DIAGRAMS
RP108Jxx1B RP108Jxx1D
V
DD
GND
V
OUT
CE
Vref
Current Limit
Thermal Shutdown
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 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 output voltage 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
(B) Auto-discharge function: No
(D) Auto-discharge function: Yes
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.
RP108J
NO.EA-203-131022
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PIN CONFIGURATIONS TO-252-5-P2
12345
∗
PIN DESCRIPTIONS
zTO-252-5-P2
Pin No. Symbol Description
1 CE Chip Enable Pin ("H" Active)
2 VDD Input Pin
3 GND Ground Pin
4 VOUT Output Pin
5 VFB Feedback Pin
∗) Tab is GND level. (They are connected to the reverse side of this IC.)
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"
ABSOLUTE MAXIMUM RATINGS
Symbol Item Rating Unit
VIN Input Voltage 6.0 V
VCE Input Voltage (CE Input Pin) −0.3 to 6.0 V
VFB Input Voltage (VFB Pin) −0.3 to 6.0 V
VOUT Output Voltage −0.3 to VIN+0.3 V
Power Dissipation (TO-252-5-P2)* Standard Land Pattern 1900
PD Power Dissipation (TO-252-5-P2)* High Wattage Land Pattern 3800 mV
Topt Operating Temperature −40 to +85 °C
Tstg Storage Temperature −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.
RP108J
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ELECTRICAL CHARACTERISTICS
VIN=VSET
*2+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 (Ta=25°C)
Symbol Item Conditions Min. Typ. Max. Unit
VSET > 1.5V ×0.99 ×1.01 V
Ta=25ºC
VSET ≤ 1.5V -15 15 mV
VSET > 1.5V ×0.97 ×1.02 V
VOUT Output Voltage
-
40ºC ≤ Ta ≤ 85ºC
VSET ≤ 1.5V -45 30 mV
ILIM Output Current Limit 3.0 A
1mA ≤ IOUT ≤ 300mA -15 2.0 20
ΔVOUT
/ΔIOUT Load regulation
1mA ≤ IOUT ≤ 3000mA -70 3.0 50
mV
VDIF Dropout Voltage Please refer to Dropout Voltage on the next page.
ISS Supply Current IOUT=0mA 350 500 μA
Istandby Standby Current VCE=0ς 2.0 5.0
μA
ΔVOUT
/ΔVIN 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*3 1.6 5.25 V
VSET ≤ 2.8V 65 dB
RR Ripple Rejection
f=1kHz,
Ripple 0.2Vp-p
IOUT=100mA VSET > 2.8V 55 dB
ΔVOUT
/ΔTa
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 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 Characteristics are done under the pulse load condition (Tj≈Ta=25ºC)
except Ripple Rejection, Output Voltage Temperature Coefficient, Output Noise and Thermal Shutdown.
*2 VSET=Set Output Voltage
∗3 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
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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)
Dropout Voltage
VDIF (V)
Output Voltage
VSET (V) Condition Typ. Max.
0.8 ≤ VSET < 0.9 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
IOUT=3000mA
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
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TYPICAL APPLICATIONS
VOUT
C1
RP108J series
VDD VOUT
GND
C2
CE
VFB
Typical Application
(External Components)
C1,C2: Ceramic Capacitors 10μF Kyocera CMX7R106M06AB
When using the RP108J Series, please consider the following points.
When using an internally fixed output voltage type, please connect the VOUT pin to the VFB pin.
However, in the case of using the Adjustable Output Voltage Type, please follow the "Technical Notes on
External Adjustable Output Voltage Type".
Phase Compensation
In these ICs, 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.
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.
RP108J
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TECHNICAL NOTES ON EXTERNAL ADJUSTABLE OUTPUT VOLTAGE TYPE
V
OUT
C1
RP108J081x
V
DD
V
OUT
GND
C2
CE
V
FB
R2
R1
Typical application for adjustable output v oltage type
(External Components)
C1,C2: Ceramic Capacitors 10μF Kyocera CMX7R106M06AB
When using RP108J081x, please consider the following points.
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
Similar to the Internally Fixed Output Voltage Type, 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.
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
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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
V
OUT = setVFB × ((R1 + R2) / R2) ..............................................................................................(8)
RIC of RP108J is approximately Typ.1.6MΩ (Topt=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
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REVERSE CURRENT PROTECTION CIRCUIT
The RP108J Series include 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 ICs of this series 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.
Fig. 1 Normal Mode Fig. 2 Reverse Current Protection Mode
Fig. 3 Reverse Current Protection Mode Detection/ Release &
Output/Reverse Current Input/Output Voltage
VREV_DET
VREV_REL
VOUT
VIN
0
Reverse Current Protection ModeNormal Mode Normal Mode
VIN/VOUT [V]IOUT/IREV
IOUT
IREV
Reverse Current/ Output Current Characteristics
35mV
30mV
RP108J
NO.EA-203-131022
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CONSTANT SLOPE CIRCUIT
RP108J Series has a Constant Slope Circuit as a function which prevents the overshoot of the output voltage.
The constant slope is a kind of 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 that doesn't require any external components.
The start-up time and start-up slope angle are fixed inside the IC.
If the capacitance of the external output capacitor becomes more than the certain capacitance, the output
current limit circuit minimizes the incoming current of the output capacitor at the start-up. As a result, the start-up
time becomes longer and the start-up slope angle becomes more gentle.
The constant slope circuit is an especially effective function for large current product like 3A output, because
driver's ability is high, and it allows a large current to flow at the start-up.
Inrush current limit circuit of conventional products Constant Slope Circuit
(Imaginary graph)
CE入力電
出力電圧
突入電流
Time (μs)
CE入力電圧
出力電圧
突入電流
Time (μs)
CE Input Voltage
Output Voltage
Output Voltage
Inrush Current
Inrush Current
CE Input Voltage
RP108J
NO.EA-203-131022
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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
Standard Land Pattern Ultra High Wattage Land Pattern
Environment Mounting on board (Wind velocity 0m/s)
Board Material Glass cloth epoxy plastic
(Double layers)
Glass cloth epoxy plastic
(Four-layers)
Board Dimensions 50mm x 50mm x 1.6mm 76.2mm x 114.3mm x 0.8mm
Copper Ratio Top side: Approx. 50%,
Back side: Approx. 50%
Top, Back side: Approx. 96%,
2nd, 3rd: 100%
Through - hole φ 0.5mm x 24pcs φ 0.4mm x 30pcs
* Measurement Results (Ta=25°C, Tjmax=125°C)
Standard Land Pattern Ultra High Wattage Land Pattern
Power Dissipation 1900mW 3800mW
θja=(125-25°C)/1.9W= 53°C/W θja= (125-25°C)/3.8W = 26°C/W
Thermal Resistance
θjc= 17°C/W θjc= 7°C/W
50
50
Standard
76.2
40
114.3
50
50
Ultra High Wattage
Measurement Board Pattern
IC Mount Area (Unit : mm)
5000
4000
3000
2000
1000
0
105
1900
2350
Power Dissipation PD (mW)
0 25 50 75 100 125 150
Ambient Temperature (°C)
P ower Dissipation
On Board
O n B o ar d
(Ultra High Wattage Land Pattern)
3800
4800
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
RP108J
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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
(6.2 0)
6.60±0.20
5.34±0.20
6.10±0.20
(1.0 0)
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
cdefghij: Product Code…Refer to MARK SPECIFICATION TABLE
kl: 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.
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• RP108J Series Mark Specification Table (TO-252-5-P2)
RP108Jxx1B RP108Jxx1D
Part Number cdefghij VSET Part Number
cdefghij VSET
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
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TEST CIRCUITS
C1
RP108J Series
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
RP108J Series
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
RP108J Series
C1=Ceramic 10µF
C2=Ceramic 10µF
V
FB
Test Circuit for Standby Current
RP108J
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TEST CIRCUITS for Adjustable Output Voltage Type (RP108J081x)
Please refer to "Technical Notes on Adjustable Output Voltage Type" when using R1 and R2 as output
capacitors.
C1 RP132x
Series
V
DD
V
OUT
CE GND
V
C2
V
OUT
↓ I
OUT
V
DD
V
OUT
CE GND
RP108J081x
V
FB
R2
R1
C1=Ceramic 10µF
C2=Ceramic 10µF
Basic Test Circuit
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 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
RP108J
NO.EA-203-131022
16
TYPICAL CHARACTERISTICS
1）Output Voltage vs. Input Voltage（C1=Ceramic10μF, C2=Ceramic10μF, Topt=25°C）
RP108x081x RP108x151x
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
012345
Input Voltage V
IN
(V)
Output Voltage V
OUT
(V)
Iout=1mA
Iout=100mA
Iout=1A
0
0.3
0.6
0.9
1.2
1.5
1.8
012345
Input Voltage V
IN
(V)
Output Voltage V
OUT
(V)
Iout=1mA
Iout=100mA
Iout=1A
RP108x281x RP108x421x
0
0.4
0.8
1.2
1.6
2
2.4
2.8
3.2
012345
Input Voltage V
IN
(V)
Output Voltage V
OUT
(V)
Iout=1mA
Iout=100mA
Iout=1A
0
0.7
1.4
2.1
2.8
3.5
4.2
4.9
5.6
012345
Input Voltage V
IN
(V)
Output Voltage V
OUT
(V)
Iout=1mA
Iout=100mA
Iout=1A
2）Supply Current vs. Input Voltage（C1=Ceramic10μF, C2=Ceramic10μF, IOUT=0ｍA, Topt=25°C）
RP108x081x RP108x151x
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 VIN (V)
Supply Current I
SS (μA)
RP108J
NO.EA-203-131022
17
RP108x281x RP108x421x
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)
3）Short Current Limit vs. Temperature/ Current Limit vs. Temperature
RP108J includes a Fold-back Protection Circuit, while a Fold-back Protection Circuit is operated, Thermal
Shutdown Circuit starts to operate. Therefore RP108J isn't allowed to test "Output voltage vs. Output Current" on
condition that a Thermal Shutdown Circuit is operated to prevent heat generated by itself.
Refer to " 3) Short Current Limit vs. Temperature / Current Limit vs. Temperature for short current limit and
current limit characteristics.
RP108x081x RP108x081x
2000
2500
3000
3500
4000
4500
5000
-50 -25 0 25 50 75
Temperature Topt (°C)
Short Current Limit (mA)
-40 85
200
220
240
260
280
300
-50-25 0 255075
Temperature Top (°C)
Current Limit (mA)
85
-40
RP108J
NO.EA-203-131022
18
4）Supply Current vs. Temperature（C1=Ceramic10μF, C2=Ceramic10μF,IOUT=0ｍA）
RP108x081x RP108x151x
300
310
320
330
340
350
360
370
380
390
400
-50 -25 0 25 50 75
Temperature Topt (°C)
Supply Current I
SS
(μA)
-40 85
300
310
320
330
340
350
360
370
380
390
400
-50 -25 0 25 50 75
Temperature Topt (°C)
Supply Current I
SS
(μA)
-40 85
5）Dropout Voltage vs. Output Current（C1=Ceramic10μF, C2=Ceramic10μF）
RP108x251x
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
6）Dropout Voltage vs. Set Output Voltage（C1=Ceramic10μF, C2=Ceramic10μF, Topt=25°C）
0
200
400
600
800
1000
1200
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
Set Output Voltage V
REG
(V)
Dropout Voltage V
DIF
(mV)
3A
300mA
RP108J
NO.EA-203-131022
19
7）Ripple Rejection vs. Input Voltage（C1=C2=10μF, Ripple=0.2Vp-p, IOUT=100mA Topt=25°C）
RP108x081x RP108x251x
0
10
20
30
40
50
60
70
80
90
100
12345
Input Voltage V
IN
(V)
Ripple Rejection (dB)
0.1kHz
1kHz
10kHz
100kHz
0
10
20
30
40
50
60
70
80
90
100
2345
Input Voltage V
IN
(V)
Ripple Rejection (dB)
0.1kHz
1kHz
10kHz
100kHz
RP108x421x
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
8）Ripple Rejection vs. Frequency（C1=none, C2=10μF, IOUT=100mA, Topt=25°C）
RP108x081x RP108x421x
0
20
40
60
80
100
120
0.1 1 10 100 1000
Frequancy f (kHz)
Ripple Rejection (dB)
V
IN
=1.8V,Ripple=0.2V p-p
0
20
40
60
80
100
120
0.1 1 10 100 1000
Frequancy f (kHz)
Ripple Rejection (dB)
V
IN
=5.2V,Ripple=0.2V p-p
RP108J
NO.EA-203-131022
20
9）Input Transient Response（C1=none, C2=10μF, IOUT=30mA, tr=tf=5μs, Topt=25°C）
RP108x081x RP108x421x
0.78
0.79
0.80
0.81
0.82
0.83
0.84
-20-10 0 1020304050607080
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 0 0.1 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
10）Load Transient Response（C1=C2=10μF, tr=tf=0.5μs, Topt=25°C）
RP108x081x RP108x081x
0.78
0.79
0.80
0.81
0.82
-40 -20 0 20 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
Out
p
ut Volta
g
e
0
RP108x421x RP108x421x
4.16
4.17
4.18
4.19
-40 -20 0 20 40 60 80 100 120 140 160
Time t (μs)
Output Voltage VOUT (V)
0
500
1000
Output Curren I
OUT (mA)
VIN=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-203-131022
21
11）Turn on Speed with CE pin（C1=Ceramic10μF, C2=Ceramic10μF, Topt=25°C）
RP108x081x RP108x151x
0.0
0.5
1.0
-50 0 50 100 150 200 250 300 350 400 450
Time t (μs)
Output Voltage V
OUT
(V)
0.0
1.0
2.0
3.0
CE Input Voltage V
CE
(V)
Iout=1mA
Iout=10 0mA
Iout=30 0mA
V
IN
=1.8V
0
0
0.0
0.5
1.0
1.5
-50 0 50 100 150 200 250 300 350 400 450
Time t (μs)
Output Voltage V
OUT
(V)
0.0
1.0
2.0
3.0
CE Input Voltage V
CE
(V)
Iout=1mA
Iout=100mA
Iout=300mA
V
IN
=2.5V
0
0
RP108x281x RP108x421x
0.0
1.0
2.0
3.0
-50 0 50 100 150 200 250 300 350 400 450
Time t (μs)
Output Voltage V
OUT
(V)
0.0
1.5
3.0
4.5
CE Input Voltage V
CE
(V)
Iout=1mA
Iout=100mA
Iout=300mA
V
IN
=3.8V
0
0
0.0
1.5
3.0
4.5
-50 0 50 100 150 200 250 300 350 400 450
Time t (μs)
Output Voltage V
OUT
(V)
0.0
2.0
4.0
6.0
CE Input Voltage V
CE
(V)
Iout=1mA
Iout=10 0mA
Iout=30 0mA
V
IN
=5.2V
0
0
12）Turn off Speed with CE pin（C1=Ceramic10μF, C2=Ceramic10μF, Topt=25°C）
RP108x081x RP108x151x
0.0
0.5
1.0
-10123456789
Time t (ms)
Output Voltage V
OUT
(V)
0.0
1.0
2.0
3.0
CE Input Voltage V
CE
(V)
Iout=1mA
Iout=100mA
Iout=300mA
V
IN
=1.8V
0
0
0.0
0.5
1.0
1.5
-10123456789
Time t (ms)
Output Voltage V
OUT
(V)
0.0
1.0
2.0
3.0
CE Input Voltage V
CE
(V)
Iout=1mA
Iout=100mA
Iout=300mA
V
IN
=2.5V
0
0
RP108J
NO.EA-203-131022
22
RP108x281x RP108x421x
0.0
1.0
2.0
3.0
-10123456789
Time t (ms)
Output Voltage VOUT (V)
0.0
1.5
3.0
4.5
CE Input Voltage VCE (V)
Iout=1mA
Iout=100mA
Iout=300mA
VIN=3.8V
0
0
0.0
1.5
3.0
4.5
-10123456789
Time t (ms)
Output Voltage V
OUT
(V)
0.0
2.0
4.0
6.0
CE Input Voltage V
CE
(V)
Iout=1mA
Iout=100mA
Iout=300mA
VIN=5.2V
0
0
13）Inrush Current
RP108x081x RP108x421x
0.0
0.5
1.0
1.5
2.0
-50 0 50 100 150 200 250 300 350 400 450
Time t (μs)
CE Input Voltage V
CE
(V) /
Output Voltage V
OUT
(V)
-50
0
50
100
150
Supply Current I
SS
(mA)
I
OUT
=100mA ,V
IN
=1.8V
0
0.0
1.5
3.0
4.5
6.0
-50 0 50 100 150 200 250 300 350 400 450
Time t (μs)
CE Input Voltage V
CE
(V)/
Output Voltage V
OUT
(V)
-100
0
100
200
300
Supply Current I
SS
(mA)
I
OUT
=100mA,V
IN
=5.2V
0
RP108J
NO.EA-203-131022
23
ESR vs. Output Current
When using these ICs, 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ﾟC to 85ﾟC
Hatched area : Noise level is under 40μV
C1,C2 :10.0μF or more
RP108x081x RP108x421x
0.01
0.1
1
10
100
0 1000 2000 3000
Output Current I
OUT
(mA)
ESR (Ω)
85°C
-40°C
V
IN
=1.6V～5.25V
0.01
0.1
1
10
100
0 1000 2000 3000
Output Current I
OUT
(mA)
ESR (Ω)
85°C
-40°C
V
IN
=4.2V～5.25V
RICOHCOMPANY,LTD.
ElectronicDevicesCompany
http://www.ricoh.com/LSI/
For the conservation of the global environment, Ricoh is advancing the decrease of the negative environmental impact material.
After Apr. 1, 2006, we will ship out the lead free products only. Thus, all products that will be shipped from now on comply with RoHS Directive.
Basically after Apr. 1, 2012, we will ship out the Power Management ICs of the Halogen Free products only. (Ricoh Halogen Free products are
also Antimony Free.)
Halogen Free
RICOHCOMPANY,LTD.
ElectronicDevicesCompany
●Higashi-ShinagawaOffice(InternationalSales)
3-32-3,Higashi-Shinagawa,Shinagawa-ku,Tokyo140-8655,Japan
Phone:+81-3-5479-2857Fax:+81-3-5479-0502
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ElectronicDevicesCompany
●Taipeioffice
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1.Theproductsandtheproductspecificationsdescribedinthisdocumentaresubjecttochangeor
discontinuationofproductionwithoutnoticeforreasons
suchasimprovement.Therefore,before
decidingtousetheproducts,pleaserefertoRicohsalesrepresentativesforthelatest
informationthereon.
2.Thematerialsinthisdocumentmaynotbecopiedorotherwisereproducedinwholeorinpart
withoutpriorwrittenconsentofRicoh.
3.Pleasebesuretotakeanynecessaryformalitiesunderrelevantlawsorregulationsbefore
exportingorotherwisetakingoutofyourcountrytheproductsorthetechnicalinformation
describedherein.
4.Thetechnicalinformationdescribedinthisdocumentshowstypicalcharacteristicsofand
exampleapplicationcircuitsfortheproducts.Thereleaseofsuchinformationisnottobe
construedasawarrantyoforagrantoflicenseunderRicoh'soranythirdparty'sintellectual
propertyrightsoranyotherrights.
5.
Theproductslistedinthisdocumentareintendedanddesignedforuseasgeneralelectronic
componentsinstandardapplications(officeequipment,telecommunicationequipment,
measuringinstruments,consumerelectronicproducts,amusementequipmentetc.).Those
customersintendingtouse
aproductinanapplicationrequiringextremequalityandreliability,
forexample,inahighlyspecificapplicationwherethefailureormisoperationoftheproduct
couldresultinhumaninjuryordeath(aircraft,spacevehicle,nuclearreactorcontrolsystem,
trafficcontrolsystem,automotiveand
transportationequipment,combustionequipment,safety
devices,lifesupportsystemetc.)shouldfirstcontactus.
6.Wearemakingourcontinuousefforttoimprovethequalityandreliabilityofourproducts,but
semiconductorproductsarelikelytofailwithcertainprobability.Inordertopreventanyinjuryto
personsordamagestopropertyresultingfromsuchfailure,customersshouldbecarefulenough
toincorporatesafetymeasuresintheirdesign,suchasredundancyfeature,firecontainment
featureandfail-safefeature.Wedonotassumeanyliability
orresponsibilityforanylossor
damagearisingfrommisuseorinappropriateuseoftheproducts.
7.Anti-radiationdesignisnotimplementedintheproductsdescribedinthisdocument.
8.
PleasecontactRicohsalesrepresentativesshouldyouhaveanyquestionsorcomments
concerningtheproductsorthetechnicalinformation.
