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. 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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 accuracy output voltage, low supply current by CMOS process. Each of these voltage regulator ICs consists of a voltage reference 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 several 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. 30A * Standby Mode ........................................TYP. 0.1A * High Accuracy Output Voltage ............2.0% * High Ripple Rejection ............................TYP. 60dB/f=1kHz * Low Dropout Voltage.............................TYP. 0.1V/IOUT=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 RN5RFxxB RN5RFxxA 4 EXT VDD 2 4 3 VOUT VDD 2 3 - - + + Vref EXT VOUT Vref Current Limit CE 5 Current Limit 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 Number RN5RF xxxx-xx a bc d Code a Contents Setting Output Voltage ( VOUT) : 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 b A : "L" active type B : "H" active type Designation of Packing type c A : Taping C : Antistatic bag only for samples d 2 Designation of Taping type Ex. TR, TL (refer to Taping Specifications, TR type is prescribed as a standard.) RN5RF PIN CONFIGURATION * SOT-23-5 5 4 CE/CE EXT (mark side) GND VDD VOUT 1 2 3 PIN DESCRIPTION Pin No. Symbol Pin Description 1 GND Ground Pin 2 VDD Input Pin 3 VOUT Output Pin 4 EXT External Transistor Drive Pin (CMOS Output) 5 CE or CE 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 for CE/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 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=25C Symbol VOUT Output Voltage IOUT Output Current IEXT EXT Current VOUT Conditions MIN. VIN-VOUT=1.0V VOUT VOUT IOUT=50mA x0.98 x1.02 VIN=4.0V, VEXT=2.0V VIN-VOUT=1.0V Load Regulation 1mAIOUT100mA VDIF Dropout Voltage IOUT=100mA Iss Supply Current Istandby Standby Current VOUT 8 0.01 Unit V A 15 mA 60 mV 0.1 0.2 V 30 50 A 0.1 1.0 A 0.5 A 0.30 %/V -60 IOUT=0mA EXT Leakage Current IOUT=50mA MAX. VIN Line Regulation RR Ripple Rejection VIN Input Voltage 10 V VEXT EXT Output Voltage 10 V VOUT Output Voltage Topt Temperature Coefficient VOUT+0.5VVIN10V 0 f=1kHz, sinusoidal 0.5Vp-p 0.05 60 VIN-VOUT=1.0V IOUT=10mA -40C Topt85C dB 100 ppm/C 4 M RPU Pull up resistance for CE pin VCEH CE Input Voltage "H" 1.5 VIN V VCEL CE Input Voltage "L" 0 0.25 V *1) * 5 VIN-VOUT=1.0V VIN=10.0V TYP. 1*1 VIN-VOUT=1.0V IOUT IEXTleak 4 Item 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. RN5RF Topt=25C Symbol Item VOUT Output Voltage IOUT Output Current IEXT EXT Current VOUT Conditions MIN. VIN-VOUT=1.0V VOUT VOUT IOUT=50mA x0.98 x1.02 VIN-VOUT=1.0V IOUT Load Regulation 1mAIOUT100mA VDIF Dropout Voltage IOUT=100mA Iss Supply Current Istandby Standby Current IEXTleak VOUT 5 8 IOUT=0mA 0.01 V A mA 60 mV 0.1 0.2 V 30 50 A 0.1 1.0 A 0.5 A 0.30 %/V EXT Leakage Current IOUT=50mA Unit 15 -60 VIN-VOUT=1.0V VIN=10.0V MAX. 1*1 VIN-VOUT=1.0V VIN=4.0V, VEXT=2.0V TYP. VIN Line Regulation RR Ripple Rejection VIN Input Voltage 10 V VEXT EXT Output Voltage 10 V VOUT Output Voltage Topt Temperature Coefficient RPD Pull down resistance for CE pin VCEH CE Input Voltage "H" 1.5 VIN V VCEL CE Input Voltage "L" 0 0.25 V VOUT+0.5VVIN10V 0 f=1kHz, sinusoidal 0.5Vp -p 0.05 60 VIN-VOUT=1.0V IOUT=10mA -40CTopt85C dB 100 ppm/C 4 M *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 RN5RFxxA VDD IN 4 EXT VOUT 2 3 - OUT Ra + CL Rb Vref Current Limit CE 5 GND 1 GND In these ICs, Output Voltage VOUT is detected by Feed-back Resistors, RA and RB and the detected Output Voltage is compared 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 increases 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 10F 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 4 IN PNP EXT 4 VDD VOUT 2 3 10F 2 ISS IOUT 10F RN5RFxxA VOUT VDD IN OUT EXT 3 RN5RFxxA 10F 10F 1 1 GND GND 5 5 CE CE Basic Test Circuit Test Circuit for Supply Current PNP PNP 4 IN OUT EXT 4 VOUT VDD 3 2 OUT IN IOUT 10F RN5RFxxA EXT VOUT VDD 3 2 RN5RFxxA 10F 1 10F 1 GND GND P.G OUT 5 5 CE Test Circuit for Ripple Rejection and Line Transient Response CE Test Circuit for Load Transient Response 7 RN5RF TYPICAL CHARACTERISTICS 1) Output Voltage vs. Input Voltage (Topt=25C) RN5RF50A 3.20 5.20 3.00 5.00 Output Voltage VOUT(V) Output Voltage VOUT(V) RN5RF30A 2.80 2.60 IOUT=0mA 2.40 IOUT=100mA IOUT=500mA 2.20 2.00 4.80 4.60 IOUT=0mA 4.40 IOUT=100mA IOUT=500mA 4.20 4.00 2 3 4 5 6 7 8 9 10 4 5 6 Input Voltage VIN(V) 7 8 9 10 Input Voltage VIN(V) 2) Output Voltage vs. Output Current (Topt=25C) RN5RF30A RN5RF50A VIN=4V 3.05 3.00 2.95 2.90 2.85 VIN=6V 5.10 Output Voltage VOUT(V) Output Voltage VOUT(V) 3.10 5.05 5.00 4.95 4.90 4.85 4.80 2.80 0 100 200 300 400 0 500 100 200 300 400 500 Output Current IOUT(mA) Output Current IOUT(mA) 3) Dropout Voltage vs. Output Current RN5RF30A RN5RF50A 0.50 0.50 Topt=-40C Dropout Voltage VDIF(V) Dropout Voltage VDIF(V) Topt=-40C Topt= 25C 0.40 Topt= 85C 0.30 0.20 0.10 Topt= 85C 0.30 0.20 0.10 0.00 0.00 0 100 200 300 400 Output Current IOUT(mA) 8 Topt= 25C 0.40 500 0 100 200 300 400 Output Current IOUT(mA) 500 RN5RF 4) Output Voltage vs. Temperature RN5RF30A 3.05 3.00 2.95 2.90 -40 -15 10 35 60 VIN=6V, IOUT=10mA 5.10 Output Voltage VOUT(V) 3.10 Output Voltage VOUT(V) RN5RF50A VIN=4V, IOUT=10mA 5.05 5.00 4.95 4.90 -40 85 -15 Temperature Topt(C) 10 35 60 85 Temperature Topt(C) 5) Supply Current vs. Input Voltage (Topt=25C) RN5RF50A RN5RF30A IOUT=0mA 100 90 Supply Current ISS(A) 90 Supply Current ISS(A) IOUT=0mA 100 80 70 60 50 40 30 20 80 70 60 50 40 30 20 10 10 0 0 0 2 4 6 8 0 10 2 4 6 8 10 Input Voltage VIN(V) Input Voltage VIN(V) 6) Supply Current vs. Temperature RN5RF50A RN5RF30A VIN=4V, IOUT=0mA 40 30 20 10 0 -40 -15 10 35 Temperature Topt(C) 60 85 VIN=6V, IOUT=0mA 50 Supply Current ISS(A) Supply Current ISS(A) 50 40 30 20 10 0 -40 -15 10 35 60 85 Temperature Topt(C) 9 RN5RF 7) Ripple Rejection vs. Frequency (Topt=25C) RN5RF50A RN5RF30A 80 70 Ripple Rejection RR (dB) Ripple Rejection RR (dB) 80 VIN=4Vdc+0.5Vp-p, IOUT=100mA, CL=10F 60 50 40 30 20 10 0 0.01 0.1 1 10 VIN=6Vdc+0.5Vp-p, IOUT=100mA, CL=10F 70 60 50 40 30 20 10 0 0.01 100 0.1 1 10 100 Frequency f (kHz) Frequency f (kHz) 8) Line Transient Response (Topt=25C) RN5RF50A Input Voltage VIN(V) 5 3.3 8 3.2 7 Input Voltage 4 3.1 3 3 Output Voltage 2 2.9 1 2.8 0 -50 -25 0 25 50 75 Input Voltage VIN(V) 6 Output Voltage VOUT(V) IOUT=300mA, CL=10F IOUT=300mA, CL=10F 5.2 Input Voltage 6 5.1 5 5 Output Voltage 4 4.9 3 2.7 100 125 150 5.3 4.8 2 -50 -25 0 Time t (s) 25 50 75 Ourput Voltage VOUT(V) RN5RF30A 4.7 100 125 150 Time t (s) 9) Load Transient Response (Topt=25C) RN5RF50A 100 3.2 Output Current 0 -100 3 Output Voltage -200 2.9 -300 2.8 -400 -100 0 100 200 Time t (s) 10 3.1 300 2.7 400 VIN=6V, CL=10F 200 3.3 Output Current IOUT(mA) Output Current IOUT(mA) 200 Output Voltage VOUT(V) VIN=4V, CL=10F 100 5.3 5.2 Output Current 0 -100 5.1 5 Output Voltage -200 4.9 -300 4.8 -400 -100 0 100 200 Time t (s) 300 4.7 400 Output Current VOUT(V) RN5RF30A RN5RF TYPICAL APPLICATION PNP Tr EXT RN5RFxxA VDD IN OUT VOUT + + Cap. Cap. GND CE Parts Transistor : 2SB766A Capacitor : 10F (tantalum type) PACKAGE DIMENSION (Unit : mm) * SOT-23-5 2.90.2 1 2 0.40.1 2.80.3 4 +0.2 1.6 -0.1 5 0.80.1 0.2 MIN. +0.2 1.1 -0.1 1.90.2 (0.95) (0.95) 0 to 0.1 3 +0.1 0.15 -0.05 11 RN5RF TAPING SPECIFICATION (Unit : mm) * SOT-23-5 4.00.1 o 1.5+0.1 -0 2.00.05 8.00.3 3.50.05 1.750.1 0.30.1 3.2 3.3 4.00.1 2.0MAX. TL TR 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 10F (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 10F 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. 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