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VOL TAGE REGULATOR WITH EXTERNAL POWER TRANSISTOR
RN5RG SERIES
APPLICATION MANUAL
NO.EA-020-0006
VOLTAGE REGULATOR WITH EXTERNAL POWER TRANSISTOR
RN5RG SERIES
OUTLINE
The RN5RG Series are voltage regulator ICs with an external power transistor with high output voltage accuracy and lowest supply current by CMOS process. Each of these voltage regulator ICs consists of a voltage reference unit, an error amplifier and resistors. These ICs are suitable for constructing regulators with ultra-low dropout voltage and an output current in the range of several tens mA to several hundreds mA. Furthermore, these ICs have a chip enable function, so that the supply current on standby can be minimized. Since the package for these ICs are SOT-23-5 (Mini-mold) package, high density mounting of the ICs on boards is possible.
FEATURES
* Ultra-Low Supply Current ..............................TYP. 50A * Standby Mode.....................................................TYP. 0.2A * Ultra-Low Dropout Voltage .............................TYP. 0.1V (IOUT=100mA : dependent on External Tr.) * Low Temperature-Drift Coefficient of Output Voltage ...................TYP. 100 ppm/C * Excellent Line Regulation ................................TYP. 0.1%/V * Output Voltage .................................................Stepwise setting with a step of 0.1V in the range of 2.0V to 6.0V is possible (refer to Selection Guide). * High Accuracy Output Voltage ........................2.5% * Small Package ..................................................SOT-23-5(Mini-Mold)
APPLICATIONS
* Power source for battery-powered equipment. * Power source for cameras, VCRs, camcorders, hand-held audio instruments, and hand-held communication equipment. * Power source for domestic appliances.
BLOCK DIAGRAM
VDD 2
4
EXT
VOUT 3
+ - Vref GND 1 CE 5
1
RN5RG
SELECTION GUIDE
The output voltage, the version, 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 : RN5RGxxxx - xx Part Number } } a bc d
Code
Contents
a b
Setting Output Voltage (VOUT): Stepwise setting with a step of 0.1V in the range of 2.0V to 6.0V is possible. A Designation of Packing Type:
c
A: Taping C: Antistatic bag for samples Designation of Taping Type: Ex. TR, TL
d
(refer to Taping Specifications) "TR" is prescribed as a standard.
For example, the product with Output Voltage 5.0V, Version A, and Taping Type TR is designated by Part Number RN5RG50AA-TR.
2
RN5RG
PIN CONFIGURATION
* SOT-23-5 5
4
(mark side)
1
2
3
PIN DESCRIPTION
Pin No. Symbol Description
1 2 3 4 5
GND VDD VOUT EXT CE
Ground Pin Input Pin Output Pin External Transistor Drive Pin (Nch Open Drain Output) Chip Enable Pin
ABSOLUTE MAXIMUM RATINGS
Symbol Item Rating Unit
VIN VCE VEXT IEXT PD Topt Tstg Tsolder
Input Voltage Input Voltage (CE Pin) EXT Output Voltage EXT Output Current Power Dissipation Operating Temperature Range Storage Temperature Range Lead Temperature (Soldering)
+12 -0.3 to VIN+0.3 +12 50 150 -40 to +85 -55 to +125 260C,10s
V V V mA mW C 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
RN5RG
ELECTRICAL CHARACTERISTICS
Symbol Item Conditions MIN. TYP. MAX. Unit
Topt=25C
Note
VOUT IOUT IEXT VOUT IOUT VDIF ISS Istandby IEXTleak VOUT VIN VIN VEXT VOUT Topt VCEH VCEL ICEH ICEL
(Note)
Output Voltage Output Current EXT Current Load Regulation Dropout Voltage Supply Current Supply Current (Standby) EXT Leakage Current Line Regulation Input Voltage EXT Output Voltage Output Voltage Temperature Coefficient CE Input Voltage "H" CE Input Voltage "L" CE Input Current "H" CE Input Current "L"
VIN=8.0V IOUT=50mA VIN-VOUT=1.0V VIN=4.0V, VEXT=2.0V VIN-VOUT=1.0V 1mAIOUT100mA IOUT=100mA VIN-VOUT=1.0V IOUT=0mA (at no load) VIN=8V
x 0.975
1000 10 -60 100 50 0.01 0.2
VOUT
x 1.025
VOUT
V mA mA Note
60 200 80 1.0 0.5
mV mV A A A %/V V V ppm/C V
IOUT=50mA VOUT+0.5VVIN8V
0
0.1
0.3 8 8
IOUT=10mA -40CTopt85C 1.5
100
0.25 0 -5 -3 0.1 -0.1
V A A
*)
The output current depends upon the performance of External PNP Transistor. Use External PNP Transistor of a low saturation type, with an hFE of 100 or more. With respect to Test Circuits, refer to the Typical Application.
4
RN5RG
OPERATION
In these ICs, Output Voltage VOUT is detected by
External PNP Transistor
Feed-back Registers RA, RB, and the detected Output Voltage is compared with a reference voltage by Error Amplifier, so that the base current of External PNP
OUT
IN VDD
4 2
EXT RA
VOUT
3
Error Amplifier + - Vref
Transistor is adjusted and Output Voltage VOUT is regulated.
RB
1
GND GND
CE
5
SELECTION GUIDE FOR EXTERNAL COMPONENTS
1.External PNP Transistor
External PNP Transistor VIN R1 R2
4
OUT
Select External PNP Transistor from the viewpoints of output current, input voltage and power dissipation. Generally External PNP Transistor with low VCE (SAT) and high hFE is suitable.
EXT
3
VOUT
CL
2.Base Resistor R2 EXT Pin of these ICs is protected by a current limit circuit from the destruction caused by excess current. However, since this current limit circuit is provided for the purpose of protecting the IC, use a resistor R2 for the protection of the External Transistor, although this IC can be operated without such a resistor. It is required that the resistance of the Resistor R2 be determined with the input voltage, output voltage,output current, temperature, and the hFE value taken into consideration and the dispersion of these values. Before making such a determination, check the characteristics by calculating the respective values by using the following formula : VIN [MIN.] -1.2(V) R2 - 0.7(V) R1 > IOUT [MAX.] hFE
3.Phase Compensation In these ICs, phase compensation is made for securing stable operation even when the load current is varied. For this purpose, be sure to use a capacitor CL (tantalum type) with a capacitance of 10F or more and a resistor R1 with a resistance of about 10k between the base and the emitter.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
RN5RG
TEST CIRCUITS
PNP PNP 10k IN VDD
2
4
10k IOUT IN OUT ISS VDD
2
2SA1213 EXT VOUT
3
2SA1213 EXT VOUT 4
3
OUT
RN5RG SERIES 10 F
5
10F 10 F
1
RN5RG SERIES CE (2)
5 1
GND CE
GND
(1)
Test Circuit 1 : Typical Characteristics 1) to 4)
Test Circuit 2 : Typical Characteristics 5) to 7)
PNP 10k IN VDD
2 4
PNP 2SA1213 10k IN Oscilloscope 1F VDD
2 4
2SA1213 EXT VOUT
3
EXT VOUT
3
Oscilloscope RN5RG SERIES GND 10mA
1 5
P.G.
RN5RG SERIES CL GND
1 5
300mA
CE
CE
Test Circuit 3 : Typical Characteristics 8) to 10)
Test Circuit 4 : Typical Characteristics 11)
6
RN5RG
TYPICAL CHARACTERISTICS
1) Output Voltage vs. Input Voltage RN5RG50A
5.0 Output Voltage VOUT(V) Output Voltage VOUT(V) IOUT=0mA 4.5 IOUT=100mA IOUT=500mA 4.0 Topt=25C 3.2 3.1 3.0 2.9 2.8 2.7 2.6 2.5 2.4 2.3 3.0 3.0 2.2 4.0 5.0 6.0 7.0 Input Voltage VIN(V) 8.0 2 3 4 5 6 7 Input Voltage VIN(V) 8 IOUT=0mA IOUT=100mA IOUT=500mA
RN5RG30A
Topt=25C
3.5
2) Output Voltage vs.Output Current RN5RG50A
4.962 4.960 Output Voltage VOUT(V) 4.958 4.956 4.954 4.952 4.950 4.948 4.946 4.944 4.942 0 100 200 300 400 Output Current IOUT(mA) 500 5.1V Topt=25C VIN=6.0V Output Voltage VOUT(V) 2.974 2.972 2.970 2.968 3.1V 2.966 2.964 2.962 2.960 0 100 200 300 400 500 Output Current IOUT(mA)
RN5RG30A
Topt=25C VIN=4.0V
3) Dropout Voltage vs. Output Curret RN5RG50A
0.45 Dropout Voltage VDIF(V) Dropout Voltage VDIF(V) C 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0.00 0 Output Current IOUT(mA) 200 400 600 800 Output Current IOUT(mA) 1000 -40C Topt=85C
RN5RG30A
C
25C
-
C
7
RN5RG
4) Output Voltage vs.Temperature
RN5RG30A VIN=4V,IOUT=10mA
3.05 V) V) 3.03 3.01 2.99 2.97 2.95 -60 -40 -20 5.1 5.08 5.06 5.04 5.02 5 0 20 40 60 C) 80 100
RN5RG50A VIN=6V,IOUT=10mA
-60 -40 -20
0
20
40
60 C)
80 100
5) Supply Current vs. Input Voltage
RN5RG30A IOUT=0mA
100 90 Supply Current Iss(A) Supply Current Iss(A) 80 70 60 50 40 30 20 10 0 2 3 4 5 6 7 8 Input Voltage VIN(V) 85C 25C 40C 100 90 80 70 60 50 40 30 20 10 0 4
RN5RG50A IOUT=0mA
40C 25C 85C
5
6 Input Voltage VIN(V)
7
8
6) Supply Current vs. Temperature
RN5RG30A VIN=4V,IOUT=0mA
60 Supply Current Iss(A) 50 Supply Current Iss(A) 40 30 20 10 0 -60 -40 -20 60 50 40 30 20 10
RN5RG50A VIN=6V,IOUT=0mA
0
20
40
60 C)
80 100
0 -60 -40 -20
0
20
40
60 C)
80 100
8
RN5RG
7) Standby Current vs. Input Voltage RN5RG30A
Standby Current Istandby(A) Standby Current Istandby(A) 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 1 2 3 4 5 6 C) 7 8 -40C 25C 85C
RN5RG30A
0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 1 2 3 4 5 6 C) 7 8 -40C 25C 85C
8) Ripple Rejection RN5RG50A
60 Ripple Rejection RR(dB) 50
9) Line Transient Response (1)
Topt=25C 8
RN5RG50A
Topt=25C IOUT=10mA
50 40 30 20 Output Voltage Deviation VOUT(V) Output Voltage Deviation VOUT(mV)
Input Voltage 40 30 20 10 0 10 Input Voltage VIN(V) 7
6 10 Output Voltage 5 0 -10
100 1k 10k 100k Frequency f(Hz)
4 0 20 40 60
-20 80 100 120 140
CL=10 F IOUT=200mA VIN=6Vdc+0.5(p-p)
Time t(s) CL=1F
10) Line Transient Response (2)
8
11) Load Transient Response
RN5RG50A Topt=25C IOUT=100mA
Input Voltage
RN5RG50A
Output Voltage Deviation VOUT(mV) 50 40 30 20 500 400 Output Current IOUT(mA) 300 200 100 0 -100 -200 -300 0 4 8 12 16 Time t(ms) Output Voltage Output Current
Topt=25C VIN=6.0V
500 400 300 200 100 0
Input Voltage VIN(V)
7
6 Output Voltage 5 10 0 -10 4 0 20 40 -20 60 80 100 120 140 Time t(s)
20
-100 24 140
CL=1F
CL=1F
9
RN5RG
TYPICAL APPLICATION
PNP Tr
EXT
IN + Cap.
VDD
RN5RG SERIES
VOUT +
OUT
Cap. GND CE
Parts Transistor : 2SA1213 Resistor : 10k Capacitor : 10F(tantalum type)
10

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