LOW RIPPLE VOLTAGE REGULATOR
WITH EXTERNAL TRANSISTOR
RN5RF SERIES
APPLICATION MANUAL
ELECTRONIC DEVICES DIVISION
NO. EA-043-9803
NOTICE
1. The products and the product specifications described in this application manual 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.
2. This application manual may not be copied or otherwise reproduced in whole or in part without prior written
consent of Ricoh.
3. Please be sure to take any necessary formalities under relevant laws or regulations before exporting or
otherwise taking out of your country the products or the technical information described herein.
4. The technical information described in this application manual 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.
5. The products listed in this document are intended and designed for use as general electronic components in
standard applications (office equipment, computer 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, traffic
control system, automotive and transportation equipment, combustion equipment, safety devices, life support
system etc.) should first contact us.
6. We are making our continuous effort to improve the quality and reliability of our products, but semiconductor
products are likely to fail with certain probability. In order prevent any injury to 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, fire-containment feature and fail-safe feature. We do not assume any liability or
responsibility for any loss or damage arising from misuse or inappropriate use of the products.
7. Anti-radiation design is not implemented in the products described in this application manual.
8. Please contact Ricoh sales representatives should you have any questions or comments concerning the
products or the technical information.
June 1995
RN5RF SERIES
APPLICATION MANUAL
CONTENTS
OUTLINE
......................................................................................................
1
FEATURES
...................................................................................................
1
APPLICATIONS
.............................................................................................
1
BLOCK DIAGRAMS
.......................................................................................
2
SELECTION GUIDE
.......................................................................................
2
PIN CONFIGURATION
...................................................................................
3
PIN DESCRIPTION
........................................................................................
3
ABSOLUTE MAXIMUM RATINGS
...................................................................
3
ELECTRICAL CHARACTERISTICS
................................................................
4
OPERATION
..................................................................................................
6
TEST CIRCUITS
............................................................................................
7
TYPICAL CHARACTERISTICS
.......................................................................
8
1) Output Voltage vs. Input Voltage
........................................................................
8
2) Output Voltage vs. Output Current
.....................................................................
8
3) Dropout Voltage vs. Output Current
....................................................................
8
4) Output Voltage vs. Temperature
........................................................................
9
5) Supply Current vs. Input Voltage
.......................................................................
9
6) Supply Current vs. Temperature
........................................................................
9
7) Ripple Rejection vs. Frequency
.......................................................................
10
8) Line Transient Response
...............................................................................
10
9) Load Transient Response
..............................................................................
10
TYPICAL APPLICATION
..............................................................................
11
PACKAGE DIMENSION
................................................................................
11
TAPING SPECIFICATION
.............................................................................
12
LOW RIPPLE VOLTAGE REGULATOR
WITH EXTERNAL TRANSISTOR
RN5RF SERIES
OUTLINE
The RN5RF Series are voltage regulator ICs which control external driver transistors with high ripple rejection, high accu-
racy output voltage, low supply current by CMOS process. Each of these voltage regulator ICs consists of a voltage refer-
ence unit, an error amplifier, output voltage setting resistor, short circuit current limiting circuit and chip enable circuit.
These ICs are suitable for constructing regulators with ultra low dropout voltage and an output current in the range of sev-
eral tens of mA and several hundreds mA. In addition to low supply current by CMOS process, chip enable function can
be used to conserve battery life during standby.
Furthermore, a supreme ripple rejection and a transient response are suited for portable communicatior such as cell
phones, PDAs, walky talkies. SOT23-5 (Mini Mold) package is available.
FEATURES
• Ultra Low Supply Current .....................TYP. 30µA
• Standby Mode ........................................TYP. 0.1µA
• High Accuracy Output Voltage ............±2.0%
• High Ripple Rejection ............................TYP. 60dB/f=1kHz
• Low Dropout Voltage.............................TYP. 0.1V/I
OUT
=100mA, dependent on External Tr.
• Low Temperature Drift .........................TYP. ±100ppm/˚C
• High Line Regulation.............................TYP. 0.05%/V
• Output Voltage .......................................Stepwise setting with a step of 0.1V in the range of 2.0V to 6.0V
• Current Limit for external Tr................TYP. 8mA, Limit a base current
APPLICATIONS
• Power source for battery-powered equipment
• Telecommunications, Cameras, VCRs
• Power source for domestic appliances
1
RN5RF
BLOCK DIAGRAM
RN5RF
××
A
4
V
DD
2
–
+
Vref
Current Limit
CE
5
Vref
Current Limit
EXT
RN5RF
××
B
4
3
V
OUT
V
DD
2
–
+
EXT
3
V
OUT
1
GND
CE
5
1
GND
SELECTION GUIDE
The output voltage, the chip enable active type, 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:
× × ×
Part
RN5RF
× ×
–
×
←
Number
}
↑ ↑↑ ↑
a bc
Code
a
Setting Output Voltage ( V
OUT
) :
Stepwise setting with a step of 0.1V in the range of 2.0V to 6.0V is possible.
Designation of Chip enable Active Type
}
d
Contents
b
A : “L” active type
B : “H” active type
Designation of Packing type
c
A : Taping
C : Antistatic bag only for samples
d
Designation of Taping type
Ex. TR, TL (refer to Taping Specifications, TR type is prescribed as a standard.)
2
编程基础
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