RN5RF Series
LDO with External Tr.
The RN5RF Series are CMOS-based LDO regulators with external power transistor. By using an external PNP transistor, a low
dropout voltage regulator ranging from several tens of mA to several hundreds mA can be configured. (Use a low saturation type PNP
transistor with h
FE
of approximately 100 to 300.)
FEATURES
•
Supply Current (I
SS
) ························Typ. 30μA (V
IN
=SET V
OUT
+1V)
•
Standby Current (I
standby
) ·················Typ. 0.1μA (V
IN
=10V, In standby)
•
Dropout Voltage (V
DIF
) ····················Typ. 0.1V
∗
(I
OUT
=100mA, V
OUT
=2.8V)
•
Ripple Rejection (RR)·····················Typ. 60dB
∗
(f=1kHz, V
OUT
>
1.6V)
=
•
•
Typ. 50dB
∗
(f=1kHz, V
OUT
<
1.5V)
=
Input Voltage Range (V
IN
) ···············1.8V to 10.0V
Output Voltage Range (V
OUT
)··········1.2V to 6.0V (internally fixed)
•
Output Voltage Accuracy················
±
2%
•
Temp. coeff. of Output Voltage······· Typ.
±
100ppm/°C
•
Line Regulation ······························ Typ. 0.05%/V
•
Fold-back Protection Circuit ··········· Current limit Typ. 8mA
•
(Base current limit of PNP Tr.)
Package ········································· SOT-23-5
∗
) The value depends on the capacity of the external PNP transistor.
BLOCK DIAGRAMS
RN5RFxxA
(
CE
pin "L" active)
4
V
DD
2
-
+
Vref
Current Limit
CE
5
Vref
Current Limit
RN5RFxxB
(CE pin "H" active)
EXT
V
OUT
V
DD
2
-
+
4
EXT
V
OUT
3
3
1
GND
CE
5
1
GND
SELECTION GUIDE
Package
SOT-23-5
Quantity per Reel
3,000 pcs
Part No.
RN5RF
.xx∗
A-TR-F
TYPICAL APPLICATION
PNP Tr
EXT
4
.xx.
: Specify the output voltage within the range 1.2V (.12.) to 6.0V (.60.)
in 0.1V steps.
.
∗
.
: Select the polarity of the CE pin from (.A.) "L" active or (.B.) "H" active.
IN
+
C1
V
DD
2
V
OUT
RN5RFxxA
3
+
C2
OUT
CE
5
1
GND
C1, C2 : Tantalum capacitor of 10μF
PNP transistor : 2SB766A
PACKAGE (Top View)
SOT-23-5
5
4
TYPICAL CHARACTERISTIC
RN5RF30A Dropout Voltage vs. Output Current
0.5
Dropout Voltage V
DIF
(V)
0.4
0.3
0.2
0.1
0
85°C
25°C
-40°C
1
2
3
1
2
3
4
5
GND
V
DD
V
OUT
EXT
CE
or CE
0
100
200
300
400
500
Output Current I
OUT
(mA)
APPLICATIONS
•
Power source for hand-held communication equipment, cameras, and VCRs
•
Power source for home appliances
•
Power source for battery-powered equipment
No.EK-072-091101
CMOS LDO Regulator
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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.
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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.
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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
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concerning the products or the technical information.
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