VOLTAGE REGULATOR WITH
EXTERNAL POWER TRANSISTOR
RN5RG SERIES
OUTLINE
NO. EA-020-130521
The RN5RG Series are CMOS-based voltage regulator ICs with an external power transistor with high output
voltage accuracy and lowest supply current. Each of these voltage regulator ICs consists of a voltage reference
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 is SOT-23-5 (Mini-mold) package, high density mounting of the ICs
on boards is possible.
FEATURES
• Ultra-Low Supply Current ..............................Typ. 50µA
• Standby Mode.....................................................Typ. 0.2µA
• Ultra-Low Dropout Voltage .............................Typ. 0.1V (I
OUT
=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)
APPLICATIONS
equipment.
• Power source for battery-powered equipment.
• Power source for cameras, VCRs, camcorders, hand-held audio instruments, and hand-held communication
• Power source for domestic appliances.
o
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p
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V
DD
2
m
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4
t
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BLOCK DIAGRAM
EXT
V
OUT
3
+
–
Vref
GND
1
CE
5
1
RN5RG
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 :
RN5RGxxxx
–
xx
←
Part Number
}
↑
d
}
↑ ↑↑
a bc
Code
Contents
a
b
Setting Output Voltage (V
OUT
):
Stepwise setting with a step of 0.1V in the range of 2.0V to 6.0V is possible.
A
Designation of Packing Type:
c
A: Taping
C: Antistatic bag for samples
Designation of Taping Type:
Ex.
TR, TL
d
(refer to Taping Specifications)
“TR” is prescribed as a standard.
For example, the product with Output Voltage 5.0V, Version A, and Taping Type TR is designated by Part
Number RN5RG50AA-TR.
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RN5RG
PIN CONFIGURATION
•
SOT-23-5
5
4
(mark side)
1
2
3
PIN DESCRIPTION
Pin No.
Symbol
Description
1
2
3
4
5
GND
V
DD
V
OUT
EXT
CE
Ground Pin
Input Pin
Output Pin
External Transistor Drive Pin (Nch Open Drain Output)
ABSOLUTE MAXIMUM RATINGS
Symbol
V
IN
V
CE
V
EXT
I
EXT
P
D
Topt
Tstg
Tsolder
o
N
Item
Input Voltage
Input Voltage (CE Pin)
EXT Output Voltage
EXT Output Current
Power Dissipation
p
-
n
Chip Enable Pin
m
o
r
t
o
Rating
n
io
Unit
+12
–0.3 to V
IN
+0.3
+12
50
150
–40 to +85
–55 to +125
260˚C,10s
V
V
V
mA
mW
˚C
˚C
Operating Temperature Range
Storage Temperature Range
Lead Temperature (Soldering)
ABSOLUTE MAXIMUM RATINGS
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.
3
RN5RG
ELECTRICAL CHARACTERISTICS
Symbol
Item
Conditions
Min.
Typ.
Max.
Unit
Topt=25˚C
Note
V
OUT
I
OUT
I
EXT
∆V
OUT
∆I
OUT
V
DIF
I
SS
Istandby
I
EXT
leak
∆V
OUT
∆V
IN
V
IN
V
EXT
∆V
OUT
∆Topt
V
CEH
V
CEL
I
CEH
I
CEL
(Note)
Output Voltage
Output Current
EXT Current
Load Regulation
Dropout Voltage
Supply Current
Supply Current (Standby)
EXT Leakage Current
Line Regulation
Input Voltage
V
IN
=8.0V
I
OUT
=50mA
V
IN
–V
OUT
=1.0V
V
IN
=4.0V, V
EXT
=2.0V
V
IN
–V
OUT
=1.0V
1mA≤I
OUT
≤100mA
I
OUT
=100mA
V
IN
–V
OUT
=1.0V
I
OUT
=0mA (at no load)
V
IN
=8V
V
OUT
V
OUT
×
0.975
1000
10
–60
100
50
0.01
×
1.025
V
mA
mA
Note
60
200
80
mV
mV
µA
I
OUT
=50mA
V
OUT
+0.5V≤V
IN
≤8V
EXT Output Voltage
Output Voltage
Temperature Coefficient
CE Input Voltage “H”
CE Input Voltage “L”
CE Input Current “H”
CE Input Current “L”
–5.0
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I
OUT
=10mA
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0.0
1.5
t
o
0.20
0.1
±100
0.0
–3.0
1.00
0.5
n
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µA
µA
0.3
8
8
%/V
V
V
ppm/˚C
V
V
µA
µA
0.1
–40˚C≤Topt≤85˚C
0.25
–0.1
*
)
The output current depends upon the performance of External PNP Transistor. Use External PNP Transistor of a low saturation type, with an h
FE
of 100 or more.
With respect to Test Circuits, refer to the Typical Application.
4
RN5RG
OPERATION
In these ICs, the output voltage V
OUT
is detected by
External PNP Transistor
feed-back registers RA, RB, and the detected the output
voltage is compared with a reference voltage by error
Amplifier, so that the base current of an external PNP
OUT
IN
V
DD
4
2
EXT
RA
V
OUT
3
Error
Amplifier
+
–
Vref
transistor is adjusted and the output voltage V
OUT
is reg-
ulated.
RB
1
GND GND
CE
5
SELECTION GUIDE FOR EXTERNAL COMPONENTS
1.External PNP Transistor
External PNP Transistor
V
IN
R1
R2
4
OUT
EXT
2.Base Resistor R2
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 h
FE
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 :
V
IN
[Min.] –1.2(V)
R2
–
0.7(V)
R1
>
I
OUT
[Max.]
h
FE
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3
V
OUT
C
L
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sipation.
Select an external PNP transistor from the view-
points of output current, input voltage and power dis-
Generally external PNP transistor with low V
CE
(
SAT
)
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and high h
FE
is suitable.
3.Phase Compensation
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 C
L
(tantalum type) with a capacitance of 10µF or more and a resistor
R1 with a resistance of about 10kΩ between the base and the emitter.There may be the case the loop oscillation
takes place when a tantalum capacitor C
L
with a large ESR is used, so select the C
L
carefully including the fre-
quency characteristics.
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