VOLTAGE REGULATOR
WITH EXTERNAL POWER TRANSISTOR
RN5RG SERIES
APPLICATION MANUAL
NO.EA-020-0006
VOLTAGE REGULATOR WITH
EXTERNAL POWER TRANSISTOR
RN5RG SERIES
1
OUTLINE
The RN5RG Series are voltage regulator ICs with an external power transistor with high output voltage accu-
racy and lowest supply current by CMOS process. Each of these voltage regulator ICs consists of a voltage refer-
ence unit, an error amplifier and resistors.
These ICs are suitable for constructing regulators with ultra-low dropout voltage and an output current in the
range of several tens mA to several hundreds mA.
Furthermore, these ICs have a chip enable function, so that the supply current on standby can be minimized.
Since the package for these ICs are SOT-23-5 (Mini-mold) package, high density mounting of the ICs
on boards is possible.
• Ultra-Low Supply Current ..............................TYP. 50µA
• Standby Mode.....................................................TYP. 0.2µA
• Ultra-Low Dropout Voltage .............................TYP. 0.1V (IOUT=100mA : dependent on External Tr.)
• Low Temperature-Drift Coefficient of Output Voltage ...................TYP. ±100 ppm/˚C
• Excellent Line Regulation ................................TYP. 0.1%/V
• Output Voltage .................................................Stepwise setting with a step of 0.1V in the range of 2.0V to 6.0V is
possible (refer to Selection Guide).
• High Accuracy Output Voltage ........................±2.5%
• Small Package ..................................................SOT-23-5(Mini-Mold)
FEATURES
APPLICATIONS
• Power source for battery-powered equipment.
• Power source for cameras, VCRs, camcorders, hand-held audio instruments, and hand-held communication
equipment.
• Power source for domestic appliances.
BLOCK DIAGRAM
2
5
43
1
Vref
VOUT
GND
VDD
–
+
EXT
CE
RN5RG××××– ×× ←Part Number
↑↑↑ ↑
abc d
RN5RG
2
SELECTION GUIDE
The output voltage, the version, the packing type, and the taping type for the ICs can be selected at the user's
request.
The selection can be made by designating the part number as shown below :
For example, the product with Output Voltage 5.0V, Version A, and Taping Type TR is designated by Part
Number RN5RG50AA-TR.
Code Contents
Setting Output Voltage (VOUT):
aStepwise setting with a step of 0.1V in the range of 2.0V to 6.0V is possible.
bA
Designation of Packing Type:
c A: Taping
C: Antistatic bag for samples
Designation of Taping Type:
dEx. TR, TL
(refer to Taping Specifications)
“TR” is prescribed as a standard.
}
}
Absolute Maximum ratings are threshold limit values that must not be exceeded even for an instant under any
conditions. Moreover, such values for any two items must not be reached simultaneously. Operation above
these absolute maximum ratings may cause degradation or permanent damage to the device. These are stress
ratings only and do not necessarily imply functional operation below these limits.
RN5RG
3
PIN CONFIGURATION
PIN DESCRIPTION
Pin No. Symbol
1 GND
2VDD
3VOUT
4 EXT
5CE
• SOT-23-5
12
3
54
(mark side)
Description
Ground Pin
Input Pin
Output Pin
External Transistor Drive Pin (Nch Open Drain Output)
Chip Enable Pin
ABSOLUTE MAXIMUM RATINGS
Symbol Item
VIN Input Voltage
VCE Input Voltage (CE Pin)
VEXT EXT Output Voltage
IEXT EXT Output Current
PDPower Dissipation
Topt Operating Temperature Range
Tstg Storage Temperature Range
Tsolder Lead Temperature (Soldering)
Rating Unit
+12 V
–0.3 to VIN+0.3 V
+12 V
50 mA
150 mW
–40 to +85 ˚C
–55 to +125 ˚C
260˚C,10s
ABSOLUTE MAXIMUM RATINGS
RN5RG
4
ELECTRICAL CHARACTERISTICS
Symbol Item
VOUT Output Voltage
IOUT Output Current
IEXT EXT Current
∆VOUT Load Regulation
∆IOUT
VDIF Dropout Voltage
ISS Supply Current
Istandby Supply Current (Standby)
IEXTleak EXT Leakage Current
∆VOUT
∆VIN Line Regulation
VIN Input Voltage
VEXT EXT Output Voltage
∆VOUT Output Voltage
∆Topt Temperature Coefficient
VCEH CE Input Voltage “H”
VCEL CE Input Voltage “L”
ICEH CE Input Current “H”
ICEL CE Input Current “L”
Conditions MIN. TYP. MAX. Unit Note
VIN=8.0V VOUT VOUT V
IOUT=50mA ×0.975 ×1.025
VIN–VOUT=1.0V 1000 mA Note
VIN=4.0V, VEXT=2.0V 10 mA
VIN–VOUT=1.0V
1mA≤IOUT≤100mA –60 60 mV
IOUT=100mA 100 200 mV
VIN–VOUT=1.0V
IOUT=0mA (at no load) 50 80 µA
VIN=8V 0.01 0.2 1.0 µA
0.5 µA
IOUT=50mA 0 0.1 0.3 %/V
VOUT+0.5V≤VIN≤8V
8V
8V
IOUT=10mA
–40˚C≤Topt≤85˚C ±100 ppm/˚C
1.5 V
0.25 V
0 0.1 µA
–5 –3 –0.1 µA
Topt=25˚C
(Note) The output current depends upon the performance of External PNP Transistor. Use External PNP Transistor of a low saturation type, with an hFE
of 100 or more.
*) With respect to Test Circuits, refer to the Typical Application.
RN5RG
5
OPERATION
VOUT
GND
GND
Vref
VDD
External PNP Transistor
EXT OUTIN
RA
RB
CE
+
–
243
Error
Amplifier
51
In these ICs, Output Voltage VOUT is detected by
Feed-back Registers RA, RB, and the detected Output
Voltage is compared with a reference voltage by Error
Amplifier, so that the base current of External PNP
Transistor is adjusted and Output Voltage VOUT is regu-
lated.
SELECTION GUIDE FOR EXTERNAL COMPONENTS
VOUT CL
VIN External PNP Transistor
EXT
OUT
R1
R2
3
4
Select External PNP Transistor from the view-
points of output current, input voltage and power dis-
sipation.
Generally External PNP Transistor with low V
CE
(
SAT
)
and high h
FE
is suitable.
1.External PNP Transistor
EXT Pin of these ICs is protected by a current limit circuit from the destruction caused by excess current.
However, since this current limit circuit is provided for the purpose of protecting the IC, use a resistor R2 for the
protection of the External Transistor, although this IC can be operated without such a resistor. It is required that
the resistance of the Resistor R2 be determined with the input voltage, output voltage,output current, tempera-
ture, and the hFE value taken into consideration and the dispersion of these values. Before making such a deter-
mination, check the characteristics by calculating the respective values by using the following formula :
VIN [MIN.] –1.2(V) –0.7(V) > IOUT [MAX.]
R2 R1 hFE
2.Base Resistor R2
In these ICs, phase compensation is made for securing stable operation even when the load current is varied.
For this purpose, be sure to use a capacitor CL(tantalum type) with a capacitance of 10µF or more and a resistor
R1 with a resistance of about 10kΩbetween the base and the emitter.There may be the case the loop oscillation
takes place when a tantalum capacitor CLwith a large ESR is used, so select the CLcarefully including the fre-
quency characteristics.
3.Phase Compensation
RN5RG
6
TEST CIRCUITS
Test Circuit 1 : Typical Characteristics 1) to 4) Test Circuit 2 : Typical Characteristics 5) to 7)
Test Circuit 3 : Typical Characteristics 8) to 10) Test Circuit 4 : Typical Characteristics 11)
IOUT
VOUT
GND
VDD EXT
RN5RG SERIES
2SA1213
PNP
OUT
IN
CE
24
51
3
10kΩ
10µF 10µF
VOUT
GND
VDD EXT
RN5RG SERIES
2SA1213
PNP
Oscilloscope
IN
CE
CL
24
51
3
10kΩ
P.G.
ISS
GND
VOUT
VDD EXT
RN5RG SERIES
2SA1213
PNP
OUT
IN
CE
(2) (1)
10kΩ
24
51
10µF
3
RN5RG
7
TYPICAL CHARACTERISTICS
1) Output Voltage vs. Input Voltage
RN5RG50A RN5RG30A
RN5RG50A
2) Output Voltage vs.Output Current
RN5RG50A
RN5RG30A
3) Dropout Voltage vs. Output Curret RN5RG30A
3.0 4.0 5.0 6.0 7.0 8.0
3.0
3.5
4.0
4.5
5.0
Input Voltage VIN(V)
Output Voltage VOUT(V)
Topt=25˚C
IOUT=0mA
IOUT=100mA
IOUT=500mA
Output Current IOUT(mA)
Dropout Voltage VDIF(V)
0 200 400 600 800 1000
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
Topt=85˚C
–40˚C
25˚C
2345678
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.2
Input Voltage VIN(V)
Output Voltage VOUT(V)
Topt=25˚C
IOUT=0mA
IOUT=100mA
IOUT=500mA
0 100 200 300 400 500
Output Current IOUT(mA)
2.960
2.962
2.964
2.966
2.968
2.970
2.972
2.974
Output Voltage VOUT(V)
Topt=25˚C
VIN=4.0V
3.1V
Output Current IOUT(mA)
Dropout Voltage VDIF(V)
0 200 400 600 800 1000
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
Topt=85˚C
–40˚C
25˚C
0 100 200 300 400 500
Output Current IOUT(mA)
4.942
4.944
4.946
4.948
4.950
4.952
4.954
4.956
4.958
4.960
4.962
Output Voltage VOUT(V)
Topt=25˚C
VIN=6.0V
5.1V
RN5RG
8
4) Output Voltage vs.Temperature
5) Supply Current vs. Input Voltage
6) Supply Current vs. Temperature
VIN=4V,IOUT=10mA
0
2.95
2.97
2.99
3.01
3.03
3.05
20 40 60 80 100-20-40-60 TemperatureTopt(˚C)
OutputVoltageVout(V)
RN5RG30A
VIN=6V,IOUT=10mA
0
5
5.02
5.04
5.06
5.08
5.1
20 40 60 80 100-20-40-60 TemperatureTopt(˚C)
OutputVoltageVout(V)
RN5RG50A
Input Voltage VIN(V)
Supply Current Iss(µA)
IOUT=0mA
34 675
0
10
20
30
40
50
60
70
80
90
100
82
RN5RG30A
Topt=-40˚C
25˚C
85˚C
VIN=4V,IOUT=0mA
Supply Current Iss(µA)
0
60
50
40
30
20
10
RN5RG30A
0 20 40 60 80 100-20-40-60 TemperatureTopt(˚C)
Supply Current Iss(µA)
VIN=6V,IOUT=0mA
0
60
50
40
30
20
10
RN5RG50A
0 20 40 60 80 100-20-40-60 TemperatureTopt(˚C)
Input Voltage VIN(V)
Supply Current Iss(µA)
IOUT=0mA
4675
0
10
20
30
40
50
60
70
80
90
100
8
RN5RG50A
Topt=-40˚C
25˚C
85˚C
RN5RG
9
7) Standby Current vs. Input Voltage
9) Line Transient Response (1)8) Ripple Rejection
10) Line Transient Response (2) 11) Load Transient Response
Standby Current Istandby(µA)
0
0.15
0.4
0.35
0.3
0.25
0.2
0.45
0.1
0.05
RN5RG30A
12 876543
TemperatureTopt(˚C)
Topt=85˚C
–40˚C
25˚C
Standby Current Istandby(µA)
0
0.15
0.4
0.35
0.3
0.25
0.2
0.45
0.1
0.05
RN5RG30A
12 876543
TemperatureTopt(˚C)
Topt=85˚C
–40˚C
25˚C
Input Voltage VIN(V)
20 40 60 80 100 120 1400
4
5
6
7
8IOUT=10mA
Topt=25˚C
Output Voltage Deviation VOUT(V)
–20
–10
0
10
20
30
40
50
Time t(µs)
CL=1µF
Input Voltage
Output Voltage
RN5RG50A
Output Current IOUT(mA)
4 8 12 16 20 24 140
0
VIN=6.0V
Topt=25˚C
Output Voltage Deviation VOUT(mV)
–100
–300
–200
–100
0
100
200
300
400
500
0
100
200
300
400
500
Time t(ms)
CL=1µF
Output Current
Output Voltage
RN5RG50A
10 100 1k 10k 100k
Frequency f(Hz)
0
10
20
30
40
50
60
Ripple Rejection RR(dB)
Topt=25˚C
CL=10 µF
IOUT=200mA
VIN=6Vdc+0.5(p-p)
RN5RG50A
Input Voltage VIN(V)
20 40 60 80 100 120 1400
4
5
6
7
8IOUT=100mA
Topt=25˚C
Output Voltage Deviation VOUT(mV)
–20
–10
0
10
20
30
40
50
Time t(µs)
CL=1µF
Input Voltage
Output Voltage
RN5RG50A
RN5RG
10
TYPICAL APPLICATION
PNP Tr
OUT
IN
EXT
CE
GND Cap.
+
Cap.
+
VOUT
VDD RN5RG SERIES
Parts Transistor : 2SA1213
Resistor : 10kΩ
Capacitor : 10µF(tantalum type)