VOLTAGE 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 4 2 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 : } } RN5RG xxxx - xx Part Number a bc d Code a b Contents 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. d TR, TL (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 1 GND Ground Pin 2 VDD Input Pin 3 VOUT Output Pin 4 EXT External Transistor Drive Pin (Nch Open Drain Output) 5 CE Description Chip Enable Pin ABSOLUTE MAXIMUM RATINGS Symbol Item Rating Unit +12 V -0.3 to VIN+0.3 V VIN Input Voltage VCE Input Voltage (CE Pin) VEXT EXT Output Voltage +12 V IEXT EXT Output Current 50 mA Power Dissipation 150 mW PD Topt Operating Temperature Range -40 to +85 C Tstg Storage Temperature Range -55 to +125 C Tsolder Lead Temperature (Soldering) 260C,10s 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 VOUT Output Voltage IOUT Output Current IEXT EXT Current VOUT IOUT Load Regulation 1000 mA 10 A 0.2 1.0 A 0.5 A 0.3 %/V Input Voltage 8 V EXT Output Voltage 8 V IEXTleak EXT Leakage Current Line Regulation VOUT Output Voltage Topt Temperature Coefficient VCEH CE Input Voltage "H" VCEL CE Input Voltage "L" ICEH CE Input Current "H" ICEL CE Input Current "L" -60 IOUT=100mA VIN-VOUT=1.0V IOUT=0mA (at no load) VIN=8V IOUT=50mA VOUT+0.5VVIN8V 0.01 0 IOUT=10mA 0.1 100 -40CTopt85C ppm/C 1.5 -5 Note mA 80 1mAIOUT100mA Note V 50 Supply Current (Standby) *) VOUT x 1.025 Unit mV Istandby (Note) VIN-VOUT=1.0V MAX. 200 Supply Current VEXT VOUT x 0.975 VIN-VOUT=1.0V VIN=4.0V, VEXT=2.0V TYP. 100 ISS VIN VIN=8.0V IOUT=50mA MIN. mV Dropout Voltage VIN Conditions 60 VDIF VOUT 4 Item Topt=25C V 0.25 V 0 0.1 A -3 -0.1 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. 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 4 IN 2 EXT 3 Error Amplifier VDD VOUT RA + - Transistor is adjusted and Output Voltage VOUT is regulated. RB Vref 1 CE Amplifier, so that the base current of External PNP OUT GND GND 5 SELECTION GUIDE FOR EXTERNAL COMPONENTS 1.External PNP Transistor External PNP Transistor Select External PNP Transistor from the view- OUT VIN points of output current, input voltage and power dis- R1 R2 4 EXT 3 VOUT sipation. CL Generally External PNP Transistor with low VCE (SAT) and high hFE is suitable. 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 VDD IN 4 10k 2SA1213 EXT VOUT 2 IOUT IN 2SA1213 VOUT EXT 4 VDD ISS OUT 3 2 OUT 3 10 F RN5RG SERIES 10F RN5RG SERIES 10 F GND CE 1 (2) 5 5 1 GND (1) CE Test Circuit 1 : Typical Characteristics 1) to 4) Test Circuit 2 : Typical Characteristics 5) to 7) PNP 10k IN PNP 2SA1213 VDD 4 10k EXT VOUT IN 3 2 2SA1213 VDD 4 EXT VOUT 2 3 Oscilloscope Oscilloscope 1F P.G. RN5RG SERIES CL RN5RG SERIES GND 1 5 CE Test Circuit 3 : Typical Characteristics 8) to 10) 6 10mA GND 1 5 300mA CE Test Circuit 4 : Typical Characteristics 11) RN5RG TYPICAL CHARACTERISTICS 1) Output Voltage vs. Input Voltage RN5RG50A RN5RG30A Topt=25C Topt=25C 3.2 5.0 4.5 IOUT=100mA IOUT=500mA 4.0 3.5 Output Voltage VOUT(V) Output Voltage VOUT(V) 3.1 IOUT=0mA 3.0 2.9 IOUT=0mA 2.8 IOUT=100mA 2.7 IOUT=500mA 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 2) Output Voltage vs.Output Current RN5RG30A RN5RG50A Topt=25C 4.962 VIN=6.0V Output Voltage VOUT(V) Output Voltage VOUT(V) 4.960 4.958 4.956 5.1V 4.954 4.952 4.950 4.948 4.946 Topt=25C 2.974 VIN=4.0V 2.972 2.970 2.968 3.1V 2.966 2.964 2.962 4.944 4.942 2.960 0 100 200 300 400 Output Current IOUT(mA) 0 500 100 200 300 400 500 Output Current IOUT(mA) 3) Dropout Voltage vs. Output Curret RN5RG30A RN5RG50A 0.45 0.45 Topt=85C 0.35 0.30 25C 0.25 0.20 0.15 -40C 0.10 0.05 0.00 0.40 Dropout Voltage VDIF(V) Dropout Voltage VDIF(V) 0.40 Topt=85C 0.35 0.30 25C 0.25 0.20 0.15 -40C 0.10 0.05 0 200 400 600 800 1000 Output Current IOUT(mA) 0.00 0 200 400 600 800 Output Current IOUT(mA) 1000 7 RN5RG 4) Output Voltage vs.Temperature RN5RG30A VIN=4V,IOUT=10mA RN5RG50A VIN=6V,IOUT=10mA 5.1 3.03 OutputVoltageVout(V) OutputVoltageVout(V) 3.05 3.01 2.99 2.97 2.95 -60 -40 -20 5.08 5.06 5.04 5.02 5 0 20 40 60 80 100 -60 -40 -20 TemperatureTopt(C) 0 20 40 60 80 100 TemperatureTopt(C) 5) Supply Current vs. Input Voltage RN5RG50A IOUT=0mA RN5RG30A IOUT=0mA 90 90 80 80 Supply Current Iss(A) 100 Supply Current Iss(A) 100 70 60 Topt=-40C 50 25C 40 85C 30 20 70 Topt=-40C 60 25C 50 40 85C 30 20 10 10 0 0 2 3 4 5 6 7 4 8 5 6 7 8 Input Voltage VIN(V) Input Voltage VIN(V) 6) Supply Current vs. Temperature RN5RG50A VIN=6V,IOUT=0mA 60 60 50 50 Supply Current Iss(A) Supply Current Iss(A) RN5RG30A VIN=4V,IOUT=0mA 40 30 20 10 0 -60 -40 -20 0 20 40 60 TemperatureTopt(C) 8 80 100 40 30 20 10 0 -60 -40 -20 0 20 40 60 TemperatureTopt(C) 80 100 RN5RG 7) Standby Current vs. Input Voltage RN5RG30A RN5RG30A 0.4 Standby Current Istandby(A) Topt=85C 0.35 0.3 0.25 25C 0.2 0.15 -40C 0.1 0.05 0.4 Topt=85C 0.35 0.3 0.25 25C 0.2 -40C 0.15 0.1 0.05 0 0 2 3 4 5 6 7 8 1 2 3 TemperatureTopt(C) 8) Ripple Rejection RN5RG50A 5 6 7 8 9) Line Transient Response (1) Topt=25C RN5RG50A 8 Topt=25C IOUT=10mA 50 40 30 20 10 50 40 Input Voltage Input Voltage VIN(V) Ripple Rejection RR(dB) 60 4 TemperatureTopt(C) 7 30 20 6 10 Output Voltage 0 5 -10 0 10 4 100 1k 10k 100k Frequency f(Hz) 0 CL=10 F IOUT=200mA VIN=6Vdc+0.5(p-p) 7 RN5RG50A 50 40 30 20 6 Output Voltage 10 0 5 -10 4 0 20 CL=1F 40 -20 80 100 120 140 11) Load Transient Response -20 60 80 100 120 140 Time t(s) Topt=25C VIN=6.0V 500 400 Output Current IOUT(mA) Input Voltage VIN(V) Input Voltage 60 Time t(s) Output Voltage Deviation VOUT(mV) 8 40 CL=1F 10) Line Transient Response (2) RN5RG50A Topt=25C IOUT=100mA 20 Output Voltage Deviation VOUT(V) 1 500 400 Output Current 300 300 200 200 100 0 100 -100 Output Voltage 0 -200 -300 0 4 8 12 16 Time t(ms) 20 -100 24 140 Output Voltage Deviation VOUT(mV) Standby Current Istandby(A) 0.45 0.45 CL=1F 9 RN5RG TYPICAL APPLICATION PNP Tr EXT IN VDD RN5RG SERIES + + Cap. Cap. GND CE Parts Transistor : 2SA1213 Resistor : 10k Capacitor : 10F(tantalum type) 10 OUT VOUT