RN5RL29AA-TR-F [RICOH]

Fixed Positive LDO Regulator, 2.9V, CMOS, PDSO5, ROHS, COMPLIANT, SOT-23, 5 PIN;
RN5RL29AA-TR-F
型号: RN5RL29AA-TR-F
厂家: RICOH ELECTRONICS DEVICES DIVISION    RICOH ELECTRONICS DEVICES DIVISION
描述:

Fixed Positive LDO Regulator, 2.9V, CMOS, PDSO5, ROHS, COMPLIANT, SOT-23, 5 PIN

ISM频段 光电二极管 输出元件 调节器
文件: 总18页 (文件大小:609K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
Rx5RL SERIES  
VOLTAGE REGULATOR  
OUTLINE  
NO. EA-022-120404  
The Rx5RL Series are CMOS-based voltage regulator ICs with high accuracy output voltage and ultra-low  
quiescent current. Each of these ICs consists of a voltage reference unit, an error amplifier, a driver transistor,  
and resistors for setting output voltage. The output voltage is fixed with high accuracy.  
Three types of packages, TO-92 (Discontinued), SOT-89 (Mini-power Mold), SOT-23-5 (Mini-mold), are  
available.  
FEATURES  
Supply Current.............................................................Typ. 1.1μA (VOUT=3.0V, VIN=5.0V)  
Dropout Voltage ...........................................................Typ. 0.04V (IOUT=1mA, VOUT=2.8V)  
Input Voltage Range ....................................................Max. 10.0V  
Output Voltage Range..................................................2.0V to 6.0V (0.1V steps)  
(For other voltages, please refer to MARK INFORMATIONS.)  
Output Voltage Accuracy..............................................±2.5%  
Temperature-Drift Coefficient of Output Voltage..........Typ. ± 100ppm/°C  
Line Regulation............................................................Typ. 0.05%/V  
Packages .....................................................................SOT-23-5 (Mini-mold), SOT-89 (Mini-power Mold),  
TO-92 (Discontinued)  
APPLICATIONS  
Power source for battery-powered equipment  
Power source for cameras, video instruments such as camcorders, VCRs, and hand- held communication  
equipment  
Precision voltage references  
1
Rx5RL  
BLOCK DIAGRAMS  
Rx5RL  
VIN  
V
OUT  
2
3
+
Vref  
1
GND  
SELECTION GUIDE  
The output voltage and package for the ICs can be selected at the user’s request.  
Product Name  
RN5RLxxAA-TR-FE  
RH5RLxxAA-T1-FE  
RE5RLxxAA-TR-F  
Package  
SOT-23-5  
Quantity per Reel  
3,000 pcs  
Pb Free  
Yes  
Halogen Free  
Yes  
Yes  
No  
SOT-89  
1,000 pcs  
Yes  
TO-92 (Discontinued)  
2,500 pcs  
Yes  
xx: The output voltage can be designated in the range from 2.0V (20) to 6.0V (60) in 0.1V steps.  
(For other voltages, please refer to MARK INFORMATIONS.)  
2
Rx5RL  
PIN CONFIGURATION  
z SOT-23-5  
5
z SOT-89  
z TO-92  
4
(mark side)  
(mark side)  
(mark side)  
3
1
2
1
2
3
1
2
3
PIN DESCRIPTION  
SOT-23-5  
Pin No  
Symbol  
GND  
VIN  
Pin Description  
1
2
3
4
5
Ground Pin  
Input Pin  
VOUT  
NC  
Output Pin  
No Connection  
No Connection  
NC  
SOT-89  
Pin No  
Symbol  
GND  
VIN  
Pin Description  
1
2
3
Ground Pin  
Input Pin  
VOUT  
Output Pin  
TO-92 (Discontinued)  
Pin No  
Symbol  
GND  
VIN  
Pin Description  
1
2
3
Ground Pin  
Input Pin  
VOUT  
Output Pin  
3
Rx5RL  
ABSOLUTE MAXIMUM RATINGS  
Symbol  
Item  
Rating  
12  
Unit  
V
VIN  
Input Voltage  
Output Voltage  
Output Current  
VOUT  
IOUT  
V
0.3 to VIN+0.3  
150  
mA  
Power Dissipation(SOT-23-5)  
Power Dissipation(SOT-89)  
Power Dissipation(TO-92) (Discontinued)  
Operating Temperature Range  
Storage Temperature Range  
420  
PD  
mW  
900  
300  
Topt  
Tstg  
40 to 85  
55 to 125  
°C  
°C  
Tsolder  
Lead Temperature (Soldering)  
260°C,10s  
) For Power Dissipation, please refer to PACKAGE INFORMATION.  
ABSOLUTE MAXIMUM RATINGS  
Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the  
permanent damages and may degrade the life time and safety for both device and system using the device  
in the field.  
The functional operation at or over these absolute maximum ratings is not assured.  
RECOMMENDED OPERATING CONDITIONS (ELECTRICAL CHARACTERISTICS)  
All of electronic equipment should be designed that the mounted semiconductor devices operate within the  
recommended operating conditions. The semiconductor devices cannot operate normally over the  
recommended operating conditions, even if when they are used over such conditions by momentary  
electronic noise or surge. And the semiconductor devices may receive serious damage when they continue  
to operate over the recommended operating conditions.  
4
Rx5RL  
ELECTRICAL CHARACTERISTICS  
• Rx5RL20A  
Topt=25˚C  
Symbol  
VOUT  
IOUT  
Item  
Conditions  
Min.  
1.950  
25  
Typ.  
2.000  
35  
Max.  
Unit  
VIN=4.0V  
2.050  
V
Output Voltage  
Output Current  
Load Regulation  
10µAIOUT10mA  
VIN=4.0V  
mA  
mV  
mV  
VOUT  
IOUT  
VIN=4.0V  
30  
45  
1mAIOUT35mA  
VDIF  
ISS  
Dropout Voltage  
IOUT=1mA  
VIN=4.0V  
60  
90  
Quiescent Current  
1.0  
3.0  
A
µ
VOUT  
VIN  
IOUT=1mA  
Line Regulation  
Input Voltage  
0.05  
100  
0.20  
10  
%/V  
V
VOUT+0.5VVIN10V  
VIN  
VOUT  
Topt  
Output Voltage  
Temperature Coefficient  
IOUT=10mA  
ppm/˚C  
–40˚CTopt85˚C  
Rx5RL30A  
Symbol  
Topt=25˚C  
Item  
Conditions  
Min.  
2.925  
35  
Typ.  
3.000  
50  
Max.  
Unit  
VIN=5.0V  
3.075  
V
VOUT  
Output Voltage  
Output Current  
Load Regulation  
10µAIOUT10mA  
IOUT  
VIN=5.0V  
mA  
mV  
VOUT  
VIN=5.0V  
40  
60  
IOUT  
1mAIOUT50mA  
VDIF  
ISS  
Dropout Voltage  
IOUT=1mA  
VIN=5.0V  
40  
60  
mV  
µA  
Quiescent Current  
1.1  
3.3  
VOUT  
IOUT=1mA  
Line Regulation  
Input Voltage  
0.05  
100  
0.20  
10  
%/V  
V
VIN  
+
VOUT 0.5VVIN10V  
VIN  
VOUT  
Topt  
Output Voltage  
Temperature Coefficient  
IOUT=10mA  
ppm/˚C  
–40˚CTopt85˚C  
5
Rx5RL  
• Rx5RL40A  
Symbol  
Topt=25˚C  
Item  
Conditions  
Min.  
3.900  
45  
Typ.  
4.000  
65  
Max.  
Unit  
VIN=6.0V  
4.100  
V
VOUT  
IOUT  
Output Voltage  
Output Current  
Load Regulation  
10µAIOUT10mA  
VIN=6.0V  
mA  
mV  
VOUT  
IOUT  
VIN=6.0V  
50  
75  
1mAIOUT65mA  
VDIF  
ISS  
Dropout Voltage  
IOUT=1mA  
VIN=6.0V  
25  
38  
mV  
µA  
Quiescent Current  
1.2  
3.6  
VOUT  
VIN  
IOUT=1mA  
Line Regulation  
Input Voltage  
0.05  
100  
0.20  
10  
%/V  
V
+
VOUT 0.5VVIN10V  
VIN  
VOUT  
Topt  
Output Voltage  
Temperature Coefficient  
IOUT=10mA  
ppm/˚C  
–40˚CTopt85˚C  
• Rx5RL50A  
Symbol  
Topt=25˚C  
Item  
Conditions  
Min.  
4.875  
55  
Typ.  
5.000  
80  
Max.  
Unit  
VIN=7.0V  
5.125  
V
VOUT  
IOUT  
Output Voltage  
Output Current  
Load Regulation  
10µAIOUT10mA  
VIN=7.0V  
mA  
mV  
VOUT  
IOUT  
VIN=7.0V  
60  
90  
1mAIOUT80mA  
VDIF  
ISS  
Dropout Voltage  
IOUT=1mA  
VIN=7.0V  
25  
38  
mV  
µA  
Quiescent Current  
1.3  
3.9  
VOUT  
VIN  
IOUT=1mA  
Line Regulation  
Input Voltage  
0.05  
100  
0.20  
10  
%/V  
V
+
VOUT 0.5VVIN10V  
VIN  
VOUT  
Topt  
Output Voltage  
Temperature Coefficient  
IOUT=10mA  
ppm/˚C  
–40˚CTopt85˚C  
6
Rx5RL  
• Rx5RL60A  
Topt=25˚C  
Symbol  
VOUT  
IOUT  
Item  
Conditions  
Min.  
5.850  
55  
Typ.  
6.000  
80  
Max.  
Unit  
VIN=8.0V  
6.150  
V
Output Voltage  
Output Current  
Load Regulation  
10µAIOUT10mA  
VIN=8.0V  
mA  
mV  
VOUT  
IOUT  
VIN=8.0V  
60  
90  
1mAIOUT80mA  
VDIF  
ISS  
Dropout Voltage  
IOUT=1mA  
VIN=8.0V  
25  
38  
mV  
µA  
Quiescent Current  
1.3  
3.9  
VOUT  
VIN  
IOUT=1mA  
Line Regulation  
Input Voltage  
0.05  
100  
0.20  
10  
%/V  
V
+
VOUT 0.5VVIN10V  
VIN  
VOUT  
Topt  
Output Voltage  
Temperature Coefficient  
IOUT=10mA  
ppm/˚C  
–40˚CTOPt85˚C  
7
Rx5RL  
ELECTRICAL CHARACTEISTICS BY OUTPUT VOLTAGE  
Output Voltage  
VOUT(V)  
OutputCurrent  
IOUT(mA)  
Load Regulation  
Dropout Voltage  
VDIF (mV)  
Part Number  
VOUT(mV)  
Conditions  
Min.  
Typ.  
Max.  
Conditions  
Min.  
Typ.  
Conditions  
Typ.  
Max.  
Conditions  
Typ.  
Max.  
Rx5RL20A  
Rx5RL21A  
Rx5RL22A  
Rx5RL23A  
Rx5RL24A  
Rx5RL25A  
Rx5RL26A  
Rx5RL27A  
Rx5RL28A  
Rx5RL29A  
Rx5RL30A  
Rx5RL31A  
Rx5RL32A  
Rx5RL33A  
Rx5RL34A  
Rx5RL35A  
Rx5RL36A  
Rx5RL37A  
Rx5RL38A  
Rx5RL39A  
Rx5RL40A  
Rx5RL41A  
Rx5RL42A  
Rx5RL43A  
Rx5RL44A  
Rx5RL45A  
Rx5RL46A  
Rx5RL47A  
Rx5RL48A  
Rx5RL49A  
Rx5RL50A  
Rx5RL51A  
Rx5RL52A  
Rx5RL53A  
Rx5RL54A  
Rx5RL55A  
Rx5RL56A  
Rx5RL57A  
Rx5RL58A  
Rx5RL59A  
Rx5RL60A  
1.950 2.000 2.050  
2.048 2.100 2.152  
2.145 2.200 2.255  
2.243 2.300 2.357  
2.340 2.400 2.460  
2.438 2.500 2.562  
2.535 2.600 2.665  
2.633 2.700 2.767  
2.730 2.800 2.870  
2.828 2.900 2.972  
2.925 3.000 3.075  
3.023 3.100 3.177  
3.120 3.200 3.280  
3.218 3.300 3.382  
3.315 3.400 3.485  
3.413 3.500 3.587  
3.510 3.600 3.690  
3.608 3.700 3.792  
3.705 3.800 3.895  
3.803 3.900 3.997  
3.900 4.000 4.100  
3.998 4.100 4.202  
4.095 4.200 4.305  
4.193 4.300 4.407  
4.290 4.400 4.510  
4.388 4.500 4.612  
4.485 4.600 4.715  
4.583 4.700 4.817  
4.680 4.800 4.920  
4.778 4.900 5.022  
4.875 5.000 5.125  
4.973 5.100 5.227  
5.070 5.200 5.330  
5.168 5.300 5.432  
5.265 5.400 5.535  
5.363 5.500 5.637  
5.460 5.600 5.740  
5.558 5.700 5.842  
5.655 5.800 5.945  
5.753 5.900 6.047  
5.850 6.000 6.150  
VIN–  
VOUT  
=2.0V  
60  
90  
25  
35  
30  
45  
1mA  
IOUT  
50  
40  
35  
30  
75  
60  
53  
45  
35mA  
VIN–  
VOUT  
=2.0V  
35  
50  
40  
60  
1mA≤  
IOUT  
VIN–  
VOUT  
=2.0V  
50mA  
VIN–  
VOUT  
=2.0V  
IOUT  
=1mA  
10µA≤  
IOUT  
VIN–  
VOUT  
=2.0V  
10mA  
45  
65  
50  
70  
1mA≤  
IOUT  
65mA  
25  
38  
VIN–  
VOUT  
=2.0V  
55  
80  
60  
90  
1mA≤  
IOUT  
80mA  
8
Rx5RL  
Topt=25˚C  
Quiescent Current  
Iss(µA)  
Line Regulation  
Input Voltage  
VIN(V)  
O
utput Voltage Tempco.  
VOUT/VIN(%/V)  
VOUT/T(ppm/˚C)  
Conditions  
Typ.  
Max. Conditions Typ.  
Max.  
Max.  
Conditions  
Typ.  
1.0  
3.0  
3.3  
3.6  
1.1  
IOUT  
=1mA  
IOUT  
VIN  
=10mA  
VOUT  
=2.0V  
0.05  
0.2  
10  
100  
VOUT+  
0.5V≤  
VIN≤  
–40˚C  
Topt  
85˚C  
1.2  
10V  
1.3  
3.9  
9
Rx5RL  
OPERATION  
Output voltage, VOUT divided at the node between  
Registers R1 and R2 is compared with the reference volt-  
age by the error amplifier, so that a constant voltage is out-  
put.  
VOUT  
VIN  
Error Amplifier  
R1  
R2  
+
Vref  
GND  
GND  
FIG. 1 Brock Diagram  
TEST CIRCUITS  
ISS  
IOUT  
VIN  
VOUT  
VIN  
Rx5RL  
Rx5RL  
VIN  
VOUT  
VOUT  
VIN  
SERIES  
SERIES  
CI  
1µF  
Co  
1µF  
+
+
CI  
1µF  
+
GND  
GND  
FIG. 3 Quiescent Current Test Circuit  
FIG. 2 Test Circuit  
VIN  
VOUT  
Rx5RL  
VOUT  
SERIES  
+
GND  
Co  
Ro  
P.G  
0.1µF  
FIG. 4 Line Transient Response Test Circuit  
10  
Rx5RL  
TYPICAL CHARACTERISTICS  
1) Output Voltage vs. Output Current  
Rx5RL30A  
Rx5RL40A  
VIN=6.0V  
VIN=5.0V  
4.1  
4.0  
3.9  
3.8  
3.7  
3.1  
3.0  
Topt=40˚C  
Topt=40˚C  
2.9  
25˚C  
85˚C  
25˚C  
85˚C  
2.8  
2.7  
0
20 40 60 80 100 120 140 160 180  
Output Current IOUT(mA)  
0
20 40 60 80 100 120 140  
Output Current IOUT(mA)  
Rx5RL50A  
VIN=7.0V  
5.1  
5.0  
4.9  
Topt=40˚C  
85˚C  
25˚C  
4.8  
4.7  
0
50  
100  
150  
200  
Output Current IOUT(mA)  
2) Output Voltage vs. Input Voltage  
Topt=25˚C  
Rx5RL30A  
Rx5RL30A  
Topt=25˚C  
IOUT=1mA  
3.05  
3.04  
3.03  
3.02  
3.01  
3.00  
2.99  
2.98  
2.97  
2.96  
2.95  
3.2  
3.0  
IOUT=1mA  
2.8  
2.6  
10mA  
2.4  
5mA  
2.2  
3
4
5
6
7
8
9
10  
2.5  
3.0  
3.5  
Input Voltage VIN(V)  
Input Voltage VIN(V)  
11  
Rx5RL  
Topt=25˚C  
IOUT=1mA  
Rx5RL40A  
Rx5RL40A  
Topt=25˚C  
4.05  
4.04  
4.03  
4.02  
4.01  
4.00  
3.99  
3.98  
3.97  
3.96  
3.95  
4.2  
4.0  
IOUT=1mA  
3.8  
3.6  
3.4  
3.2  
5mA  
10mA  
3.5  
4.0  
4.5  
4
5
6
7
8
9
10  
Input Voltage VIN(V)  
Input Voltage VIN(V)  
Topt=25˚C  
IOUT=1mA  
Rx5RL50A  
Rx5RL50A  
Topt=25˚C  
5.05  
5.04  
5.03  
5.02  
5.01  
5.00  
4.99  
4.98  
4.97  
4.96  
4.95  
5.2  
5.0  
IOUT=1mA  
4.8  
4.6  
4.4  
4.2  
5mA  
10mA  
4.5  
5.0  
Input Voltage VIN(V)  
5.5  
10  
5
7
8
9
6
Input Voltage VIN(V)  
3) Dropout Voltage vs. Output Curret  
Rx5RL30A  
Rx5RL40A  
2.0  
2.0  
1.8  
1.8  
1.6  
1.6  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
0.0  
25˚C  
85˚C  
25˚C  
85˚C  
Topt=40˚C  
Topt=40˚C  
0.0  
0
10  
20  
30  
40  
50  
0
10  
20  
30  
40  
50  
Output Current IOUT(mA)  
Output Current IOUT(mA)  
12  
Rx5RL  
Rx5RL50A  
2.0  
1.8  
1.6  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
85˚C  
25˚C  
Topt=40˚C  
0.0  
0
10  
20  
30  
40  
50  
Output Current IOUT(mA)  
4) Output Voltage vs.Temperature  
VIN=6.0V  
VIN=5.0V  
IOUT=10mA  
Rx5RL30A  
Rx5RL40A  
IOUT=10mA  
4.05  
4.03  
4.01  
3.99  
3.97  
3.95  
3.05  
3.03  
3.01  
2.99  
2.97  
2.95  
50 30 10 10 30 50 70 90  
Temperature Topt(˚C)  
50 30 10 10 30 50 70 90  
Temperature Topt(˚C)  
VIN=7.0V  
Rx5RL50A  
IOUT=10mA  
5.10  
5.08  
5.06  
5.04  
5.02  
5.00  
4.98  
4.96  
4.94  
4.92  
4.90  
50 30 10 10 30 50 70 90  
Temperature Topt(˚C)  
13  
Rx5RL  
5) Quiescent Current vs. Input Voltage  
Rx5RL30C  
Rx5RL40A  
Topt=25˚C  
Topt=25˚C  
1.5  
1.5  
1.4  
1.3  
1.2  
1.1  
1.0  
0.9  
0.8  
0.7  
0.6  
0.5  
1.4  
1.3  
1.2  
1.1  
1.0  
0.9  
0.8  
0.7  
0.6  
0.5  
3
4
5
6
7
8
9
10  
5
6
7
8
9
10  
Input Voltage VIN(V)  
Input Voltage VIN(V)  
Rx5RL50A  
Topt=25˚C  
2.0  
1.9  
1.8  
1.7  
1.6  
1.5  
1.4  
1.3  
1.2  
1.1  
1.0  
4
5
6
7
8
9
10  
Input Voltage VIN(V)  
6) Quiescent Current vs. Temperature  
Rx5RL30A  
Rx5RL40A  
VIN=5.0V  
VIN=6.0V  
1.5  
1.4  
1.3  
1.2  
1.1  
1.0  
0.9  
0.8  
0.7  
0.6  
0.5  
2.0  
1.9  
1.8  
1.7  
1.6  
1.5  
1.4  
1.3  
1.2  
1.1  
1.0  
40 20  
0
20 40 60 80 100  
40 20  
0
20 40 60 80 100  
Temperature Topt(˚C)  
Temperature Topt(˚C)  
14  
Rx5RL  
Rx5RL50A  
7) Dropout Voltage vs. Set Output Voltage  
VIN=7.0V  
2.5  
2.4  
2.3  
2.2  
2.1  
2.0  
0.7  
0.6  
0.5  
0.4  
0.3  
1.9  
1.8  
1.7  
1.6  
1.5  
IOUT=10mA  
0.2  
5mA  
0.1  
1mA  
0.0  
40 20  
0
20  
80 100  
40 60  
0
1
2
3
4
5
6
Temperature Topt(˚C)  
Set Output Voltage Vreg(V)  
8) Line Transient Response (1)  
IOUT=1mA  
8.0  
7.5  
7.0  
6.5  
Input Voltage  
6.0  
5.5  
5.0  
4.5  
Output Voltage  
4.0  
0
1
2
3
4
Time t(ms)  
9) Line Transient Response (2)  
IOUT=10mA  
8.0  
7.5  
7.0  
Input Voltage  
6.5  
6.0  
5.5  
5.0  
4.5  
Output Voltage  
4.0  
0
1
2
3
4
Time t(ms)  
15  
Rx5RL  
TYPICAL APPLICATION  
In Rx5RL Series, a constant voltage can be obtained  
without using Capacitors C1 and C2. However, when the  
wire connected to Vin is long, use Capacitor C1. Output  
noise can be reduced by using Capacitor C2.  
VIN  
+
VOUT  
Rx5RL  
VIN  
VOUT  
SERIES  
+
C1  
C2  
GND  
Insert Capacitors C1 and C2 with the capacitance of  
0.1µF to 2.0µF between Input/Output Pins and GND Pin  
with minimum wiring.  
GND  
GND  
APPLICATION CIRCUITS  
• VOLTAGE BOOST CIRCUIT  
The output voltage can be obtained by the follow-  
ing formula :  
1
VIN  
VOUT  
Rx5RL  
*
VIN  
VOUT  
VOUT=Vreg · (1+R2/R1) + ISS R · 2  
SERIES  
Since the quiescent current of Rx5RE Series is so  
small that the resistances of R1 and R2 can be set as  
large as several hundreds kand therefore the sup-  
ply current of “Voltage Boost Circuit” itself can be  
reduced.  
+
GND  
R1  
R2  
C2  
ISS  
+
C1  
Furthermore, since Rx5RL Series are operated by  
a constant voltage, the supply current of “Voltage  
Boost Circuit” is not substantially affected by the  
input voltage.  
1) Vreg : Set Output Voltage of Rx5RL Series.  
*
• DUAL POWER SUPPLY CIRCUIT  
As shown in the circuit diagram, a dual power sup-  
ply circuit can be constructed by using two Rx5RL  
Series.  
IC1  
VIN  
VOUT  
C1  
VOUT1  
VIN  
Rx5RL20A  
5V  
+
+
This circuit diagram shows a dual power supply  
circuit with an output of 3V and an output of 5V.  
When the minimum output current of IC2 is larger  
than ISS of IC1, Resistor R is unnecessary. Diode D is  
a protection diode for the case where VOUT2 becomes  
larger than VOUT1.  
D
R
ISS  
GND  
IC2  
VOUT  
C3  
VIN  
+
VOUT2  
3V  
Rx5RL30A  
GND  
C2  
GND  
GND  
16  
Rx5RL  
• CURRENT BOOST CIRCUIT  
Output current of 60mA or more can be obtained by  
the current boost circuit constructed as shown in this cir-  
cuit diagram.  
Tr.1  
VIN  
VOUT  
Rx5RL  
SERIES  
VIN  
VOUT  
GND  
+
+
C2  
C1  
GND  
GND  
• CURRENT BOOST CIRCUIT WITH OVERCURRENT LIMIT CIRCUIT  
A circuit for protecting Tr.1 from the destruction  
Tr.1  
R2  
caused by output short-circuit or overcurrent is shown in  
this circuit diagram.  
Vbe2  
Tr.2  
IOUT  
When the voltage reduction caused by the current ( aa  
IOUT) which flows through R2 reaches Vbe2 of Tr.2 by  
additionally providing the current boost circuit with Tr.2  
and R2, Tr.2 is turned on and the base current of Tr.1 is  
increased, so that the output current is limited.  
Current limit of overcurrent limit circuit is obtained  
as follows :  
VIN  
VOUT  
Rx5RL  
VIN  
SERIES  
R1  
VOUT  
+
+
C1  
C2  
GND  
GND  
GND  
IOUT  
Vbe2/R2  
• CURRENT SOURCE  
A current source with the structure as shown in this  
circuit diagram can be used. Output Current IOUT is  
obtained as follows :  
IOUT  
VIN  
VOUT  
Rx5RL  
SERIES  
VIN  
R
1
*
IOUT= Vreg /R + ISS  
GND  
+
ISS  
C1  
Output current, IOUT should not exceed its allowable  
current.  
1) Vreg : Set output voltage of Rx5RL Series.  
*
17  
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.  
2.The materials in this document 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 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.  
5.The products listed in this document are intended and designed for use as general electronic  
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,  
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 to 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, firecontainment  
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 document.  
8.Please contact Ricoh sales representatives should you have any questions or comments  
concerning the products or the technical information.  
RICOH COMPANY,LTD. Electronic Devices Company  
Ricoh awarded ISO 14001 certification.  
Ricoh presented with the Japan Management Quality Award for 1999.  
The Ricoh Group was awarded ISO 14001 certification, which is an international standard for  
environmental management systems, at both its domestic and overseas production facilities.  
Our current aim is to obtain ISO 14001 certification for all of our business offices.  
Ricoh continually strives to promote customer satisfaction, and shares the achievements  
of its management quality improvement program with people and society.  
Ricoh completed the organization of the Lead-free production for all of our products.  
After Apr. 1, 2006, we will ship out the lead free products only. Thus, all products that  
will be shipped from now on comply with RoHS Directive.  
http://www.ricoh.com/LSI/  
RICOH COMPANY, LTD.  
Electronic Devices Company  
● Higashi-Shinagawa Office (International Sales)  
3-32-3, Higashi-Shinagawa, Shinagawa-ku, Tokyo 140-8655, Japan  
Phone: +81-3-5479-2857 Fax: +81-3-5479-0502  
RICOH EUROPE (NETHERLANDS) B.V.  
● Semiconductor Support Centre  
Prof. W.H.Keesomlaan 1, 1183 DL Amstelveen, The Netherlands  
P.O.Box 114, 1180 AC Amstelveen  
Phone: +31-20-5474-309 Fax: +31-20-5474-791  
RICOH ELECTRONIC DEVICES KOREA Co., Ltd.  
11 floor, Haesung 1 building, 942, Daechidong, Gangnamgu, Seoul, Korea  
Phone: +82-2-2135-5700 Fax: +82-2-2135-5705  
RICOH ELECTRONIC DEVICES SHANGHAI Co., Ltd.  
Room403, No.2 Building, 690#Bi Bo Road, Pu Dong New district, Shanghai 201203,  
People's Republic of China  
Phone: +86-21-5027-3200 Fax: +86-21-5027-3299  
RICOH COMPANY, LTD.  
Electronic Devices Company  
● Taipei office  
Room109, 10F-1, No.51, Hengyang Rd., Taipei City, Taiwan (R.O.C.)  
Phone: +886-2-2313-1621/1622 Fax: +886-2-2313-1623  

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