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
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.
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without prior written consent of Ricoh.
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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.
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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
could result in human injury or death (aircraft, spacevehicle, nuclear reactor control system,
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devices, life support system etc.) should first contact us.
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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, firecontainment
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damage arising from misuse or inappropriate use of the products.
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concerning the products or the technical information.
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