RN5RF51AC-TL-FB [RICOH]
Switching Controller, PDSO5, MINI, PLASTIC, SOT-23, 5 PIN;
| 型号： | RN5RF51AC-TL-FB |
| 厂家： | 
RICOH ELECTRONICS DEVICES DIVISION |
| 描述： | Switching Controller, PDSO5, MINI, PLASTIC, SOT-23, 5 PIN ISM频段 开关 光电二极管 |
| 文件： | 总16页 (文件大小：131K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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
BLOCK DIAGRAMS
SELECTION GUIDE
PIN CONFIGURATION
1
.......................................................................................
.......................................................................................
2
2
...................................................................................
3
........................................................................................
PIN DESCRIPTION
3
...................................................................
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
3
................................................................
4
..................................................................................................
OPERATION
6
............................................................................................
TEST CIRCUITS
7
.......................................................................
TYPICAL CHARACTERISTICS
8
1) Output Voltage vs. Input Voltage........................................................................
2) Output Voltage vs. Output Current .....................................................................
3) Dropout Voltage vs. Output Current ....................................................................
4) Output Voltage vs. Temperature ........................................................................
5) Supply Current vs. Input Voltage .......................................................................
6) Supply Current vs. Temperature ........................................................................
8
8
8
9
9
9
7) Ripple Rejection vs. Frequency .......................................................................
8) Line Transient Response...............................................................................
9) Load Transient Response..............................................................................
10
10
10
11
11
12
..............................................................................
................................................................................
TYPICAL APPLICATION
PACKAGE DIMENSION
TAPING SPECIFICATION
.............................................................................
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
• Low Dropout Voltage
• Low Temperature Drift
TYP. 60dB/f=1kHz
TYP. 0.1V/IOUT=100mA, dependent on External Tr.
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
TYP. 8mA, Limit a base current
...............
• Current Limit for external Tr.
APPLICATIONS
• Power source for battery-powered equipment
• Telecommunications, Cameras, VCRs
• Power source for domestic appliances
1
RN5RF
BLOCK DIAGRAM
RN5RF××B
RN5RF××A
EXT
EXT
4
4
VDD
VOUT VDD
VOUT
2
2
5
3
1
3
1
–
+
–
+
Vref
Vref
Current Limit
Current Limit
5
GND
GND
CE
CE
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:
RN5RF ××××–××←Part Number
↑ ↑ ↑
↑
a b c
d
Code
Contents
Setting Output Voltage (VOUT) :
a
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
A : “L” active type
b
B : “H” active type
Designation of Packing type
A : Taping
c
C : Antistatic bag only for samples
Designation of Taping type
d
Ex. TR, TL (refer to Taping Specifications, TR type is prescribed as a standard.)
2
RN5RF
PIN CONFIGURATION
• SOT-23-5
5
4
CE/CE
(mark side)
EXT
GND
VDD
VOUT
1
2
3
PIN DESCRIPTION
Pin No.
Symbol
GND
VDD
Pin Description
1
2
3
4
5
Ground Pin
Input Pin
VOUT
EXT
Output Pin
External Transistor Drive Pin (CMOS Output)
CE or CE Chip Enable Pin
ABSOLUTE MAXIMUM RATINGS
Symbol
Item
Rating
Unit
V
VIN
Input Voltage
12
–0.3 to VIN +0.3
12
VCE
Input Voltage for CE/CE Pin
EXT Output Voltage
V
VEXT
IEXT
PD
V
EXT Output Current
50
mA
mW
˚C
Power Dissipation
150
Topt
Tstg
Operating Temperature Range
Storage Temperature Range
–40 to +85
–55 to +125
˚C
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
RN5RF
ELECTRICAL CHARACTERISTICS
Topt=25˚C
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
VIN–VOUT=1.0V
IOUT=50mA
VOUT
VOUT
VOUT
Output Voltage
V
×0.98
×1.02
IOUT
IEXT
Output Current
EXT Current
VIN–VOUT=1.0V
1*1
8
A
VIN=4.0V, VEXT=2.0V
5
15
mA
∆VOUT
∆IOUT
VIN–VOUT=1.0V
Load Regulation
Dropout Voltage
–60
60
mV
V
1mA≤IOUT≤100mA
VDIF
IOUT=100mA
0.1
0.2
VIN–VOUT=1.0V
IOUT=0mA
Iss
Supply Current
30
50
µA
Istandby
Standby Current
VIN=10.0V
0.01
0
0.1
1.0
0.5
µA
µA
IEXTleak
EXT Leakage Current
∆VOUT
∆VIN
IOUT=50mA
Line Regulation
Ripple Rejection
0.05
60
0.30
%/V
dB
VOUT+0.5V≤VIN≤10V
f=1kHz, sinusoidal 0.5Vp-p
VIN–VOUT=1.0V
RR
VIN
Input Voltage
10
10
V
V
VEXT
EXT Output Voltage
∆VOUT
∆Topt
Output Voltage
IOUT=10mA
100
4
ppm/
˚C
Temperature Coefficient
–40˚C≤Topt≤85˚C
RPU
VCEH
VCEL
Pull up resistance for CE pin
CE Input Voltage “H”
MΩ
V
1.5
0
VIN
CE Input Voltage “L”
0.25
V
1) The output current depends on the performance of external PNP transistor. Use External PNP transistor of a low saturation type, with an hFE between
100 and 300.
*
*
)
With respect to Test Circuit, refer to Typical Application.
4
RN5RF
Topt=25˚C
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
VIN–VOUT=1.0V
IOUT=50mA
VOUT
VOUT
VOUT
Output Voltage
V
×0.98
×1.02
IOUT
IEXT
Output Current
EXT Current
VIN–VOUT=1.0V
1*1
8
A
VIN=4.0V, VEXT=2.0V
5
15
mA
∆VOUT
∆IOUT
VIN–VOUT=1.0V
Load Regulation
Dropout Voltage
–60
60
mV
V
1mA≤IOUT≤100mA
VDIF
IOUT=100mA
0.1
0.2
VIN–VOUT=1.0V
IOUT=0mA
Iss
Supply Current
30
50
µA
Istandby
Standby Current
VIN=10.0V
0.01
0
0.1
1.0
0.5
µA
µA
IEXTleak
EXT Leakage Current
∆VOUT
∆VIN
IOUT=50mA
Line Regulation
Ripple Rejection
0.05
60
0.30
%/V
dB
VOUT+0.5V≤VIN≤10V
f=1kHz, sinusoidal 0.5Vp-p
VIN–VOUT=1.0V
RR
VIN
Input Voltage
10
10
V
V
VEXT
EXT Output Voltage
∆VOUT
∆Topt
Output Voltage
IOUT=10mA
100
4
ppm/
˚C
Temperature Coefficient
–40˚C≤Topt≤85˚C
RPD
VCEH
VCEL
Pull down resistance for CE pin
CE Input Voltage “H”
MΩ
V
1.5
0
VIN
CE Input Voltage “L”
0.25
V
1) The output current depends on the performance of external PNP transistor. Use External PNP transistor of a low saturation type, with an hFE between
100 and 300.
*
*
)
With respect to Test Circuit, refer to Typical Application.
5
RN5RF
OPERATION
PNP Tr
EXT
4
RN5RF××A
VDD
VOUT
IN
2
5
OUT
3
1
–
+
Ra
Rb
CL
Vref
CE
Current Limit
GND
GND
In these ICs, Output Voltage VOUT is detected by Feed-back Resistors, RA and RB and the detected Output Voltage is com-
pared with a reference voltage by Error Amplifier so that the base current of External PNP Transistor can be adjusted and
Output Voltage VOUT is able to be regulated.
The base current of an external Tr. is monitored and controlled by an internal Base Current Limit circuit to keep current
within a proper range. Furthermore, the other current limit circuit prevents a problem which is that a base current increas-
es sharply when input Voltage VIN becomes lower than Set Output Voltage.
Notes on selecting external components
(1) On external PNP transistor
Be careful of output current, input voltage and power dissipation of External PNP Transistor.
It is said that External PNP Transistor with a low VCE (sat) and an hFE between 100 and 300 is suitable.
(2) On phase compensation
In these ICs, phase compensation is made for securing stable operation on the output stage even if the
load current is varied. For this purpose, be sure to use a capacitor CL (tantalum type) with a capacitance
of 10µF of more. There may be the case the loop oscillation takes place when a tantalum capacitor CL with
a large ESR is used, so select the CL carefully including the frequency characteristics.
6
RN5RF
TEST CIRCUITS
PNP
PNP
4
EXT
EXT
4
VDD
VOUT
VOUT
VDD
IN
IN
ISS
OUT
OUT
10µF
2
3
2
3
1
IOUT
RN5RF××A
RN5RF××A
10µF
10µF
10µF
1
GND
GND
5
5
CE
CE
Basic Test Circuit
Test Circuit for Supply Current
PNP
PNP
EXT
4
EXT
4
VOUT
VDD
VOUT
GND
VDD
IN
OUT
OUT
IN
2
3
3
1
2
IOUT
RN5RF××A
10µF
RN5RF××A
10µF
10µF
1
GND
P.G
5
5
CE
CE
Test Circuit for Ripple Rejection and Line Transient Response
Test Circuit for Load Transient Response
7
RN5RF
TYPICAL CHARACTERISTICS
1) Output Voltage vs. Input Voltage (Topt=25˚C)
RN5RF50A
RN5RF30A
3.20
5.20
5.00
4.80
4.60
4.40
4.20
4.00
3.00
2.80
2.60
IOUT=0mA
IOUT=0mA
2.40
IOUT=100mA
IOUT=100mA
IOUT=500mA
2.20
2.00
IOUT=500mA
2
3
4
5
6
7
8
9
10
4
0
0
5
6
7
8
9
10
Input Voltage VIN(V)
Input Voltage VIN(V)
2) Output Voltage vs. Output Current (Topt=25˚C)
RN5RF30A
RN5RF50A
VIN=6V
VIN=4V
5.10
5.05
5.00
4.95
4.90
4.85
4.80
3.10
3.05
3.00
2.95
2.90
2.85
2.80
100
200
300
400
500
0
100
200
300
400
500
Output Current IOUT(mA)
Output Current IOUT(mA)
3) Dropout Voltage vs. Output Current
RN5RF30A
RN5RF50A
0.50
0.40
0.30
0.20
0.10
0.00
0.50
Topt=–40˚C
Topt= 25˚C
Topt= 85˚C
Topt=–40˚C
0.40
0.30
0.20
0.10
0.00
Topt= 25˚C
Topt= 85˚C
100
200
300
400
500
0
100
200
300
400
500
Output Current IOUT(mA)
Output Current IOUT(mA)
8
RN5RF
4) Output Voltage vs. Temperature
RN5RF30A
RN5RF50A
VIN=6V, IOUT=10mA
VIN=4V, IOUT=10mA
3.10
3.05
3.00
2.95
2.90
5.10
5.05
5.00
4.95
4.90
–40
–15
10
35
60
85
–40
–15
10
35
60
85
Temperature Topt(˚C)
Temperature Topt(˚C)
5) Supply Current vs. Input Voltage (Topt=25˚C)
RN5RF30A
RN5RF50A
IOUT=0mA
IOUT=0mA
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
0
2
4
6
8
10
0
2
4
6
8
10
Input Voltage VIN(V)
Input Voltage VIN(V)
6) Supply Current vs. Temperature
RN5RF30A
RN5RF50A
VIN=6V, IOUT=0mA
VIN=4V, IOUT=0mA
50
40
30
20
10
0
50
40
30
20
10
0
–40
–15
10
35
60
85
–40
–15
10
35
60
85
Temperature Topt(˚C)
Temperature Topt(˚C)
9
RN5RF
7) Ripple Rejection vs. Frequency (Topt=25˚C)
RN5RF30A
RN5RF50A
IN=6Vdc+0.5Vp-p, IOUT=100mA, CL=10µF
V
V
IN=4Vdc+0.5Vp-p, IOUT=100mA, CL=10µF
80
70
60
50
40
30
20
10
0
80
70
60
50
40
30
20
10
0
0.01
0.1
1
10
100
0.01
0.1
1
10
100
Frequency f (kHz)
Frequency f (kHz)
8) Line Transient Response (Topt=25˚C)
RN5RF50A
RN5RF30A
IOUT=300mA, CL=10µF
IOUT=300mA, CL=10µF
6
5
4
3
2
1
0
3.3
8
7
6
5
4
3
2
5.3
5.2
5.1
5
3.2
3.1
3
Input Voltage
Input Voltage
Output Voltage
Output Voltage
2.9
2.8
2.7
4.9
4.8
4.7
–50 –25
0
25 50 75 100 125 150
–50 –25
0
25 50 75 100 125 150
Time t (µs)
Time t (µs)
9) Load Transient Response (Topt=25˚C)
RN5RF50A
RN5RF30A
VIN=6V, CL=10µF
VIN=4V, CL=10µF
200
5.3
200
100
3.3
100
0
5.2
5.1
5
3.2
3.1
3
Output Current
Output Voltage
Output Current
Output Voltage
0
–100
–200
–300
–400
–100
–200
–300
–400
4.9
4.8
4.7
2.9
2.8
2.7
–100
0
100
200
300
400
–100
0
100
200
300
400
Time t (µs)
Time t (µs)
10
RN5RF
TYPICAL APPLICATION
PNP Tr
EXT
IN
+
VDD
RN5RF××A
VOUT
OUT
+
Cap.
Cap.
CE
GND
Parts Transistor : 2SB766A
Capacitor : 10µF (tantalum type)
PACKAGE DIMENSION (Unit : mm)
· SOT-23-5
2.9±0.2
+0.2
1.1
–0.1
1.9±0.2
(0.95) (0.95)
0.8±0.1
5
4
0 to 0.1
1
2
3
0.4±0.1
+0.1
–0.05
0.15
11
RN5RF
TAPING SPECIFICATION (Unit : mm)
· SOT-23-5
4.0±0.1
+0.1
–0
ø
1.5
0.3±0.1
2.0±0.05
3.2
3.3
4.0±0.1
T L
2.0MAX.
T R
User Direction of Feed.
APPLICATION HINTS
Using these ICs, be sure to take care of the following points:
1) Minimize the impedance of VDD and GND wiring. A large current flows through these wiring. When the
wiring impedance is high, the operation of the ICs tends to be unstable and is vulnerable to noise.
2) Provide a capacitor with a capacitance of about 10µF (tantalum type) between VDD pin and GND pin with a
minimum wiring length.
3) Rush current flows into the capacitor connected to the output of Regulators at the start of the operation of
the Regulators. As these ICs are used with external PNP Transistor, the current drive performance of this
Regulator is excellent. Therefore, when Regulator stars to operate, for example, under the conditions that
hFE of External PNP Transistor is 100 and the base current of the limiter is 8mA, a rush current becomes
800mA.
4) In these ICs, phase compensation is made for securing stable operation on the output stage even if the
load current is varied. For this purpose, be sure to use a capacitor CL (tantalum type) with a capacitance
of 10µF of more. There may be the case the loop oscillation takes place when a tantalum capacitor CL with
a large ESR is used, so select the CL carefully including the frequency characteristics.
5) Set external parts as close as possible to the IC and minimize the connection between the parts and the IC.
12
RICOH COMPANY, LTD.
ELECTRONIC DEVICES DIVISION
HEADQUARTERS
13-1, Himemuro-cho, Ikeda City, Osaka 563-8501, JAPAN
Phone 81-727-53-1111 Fax 81-727-53-6011
YOKOHAMA OFFICE (International Sales)
3-2-3, Shin-Yokohama, Kohoku-ku, Yokohama City, Kanagawa 222-8530,
JAPAN
Phone 81-45-477-1697 Fax 81-45-477-1694 • 1695
http://www.ricoh.co.jp/LSI/english/
RICOH CORPORATION
ELECTRONIC DEVICES DIVISION
SAN JOSE OFFICE
3001 Orchard Parkway, San Jose, CA 95134-2088, U.S.A.
Phone 1-408-432-8800 Fax 1-408-432-8375
相关型号：
RN5RF51BA-TR-F
Switching Regulator, 1kHz Switching Freq-Max, CMOS, PDSO5, ROHS COMPLIANT, SOT-23, 5 PIN
RICOH
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