NJM2387A ADJUSTABLE LOW DROPOUT VOLTAGE REGULATOR WITH ON/OFF CONTROL

Transcription

1 ADJUSTABLE LOW DROPOUT VOLTAGE REGULATOR WITH ON/OFF CONTROL GENERAL DESCRIPTION The NJM37A is an adjustable low dropout voltage regulator. The output current is up to.a and dropout voltage is.v typ. at Io=.5A. OFF control quiescent current is drastically reduced compare with the current NJM37 through changing ON/OFF control circuit. The NJM37A is suitable for power module, TV, Display, car stereo and low power applications. PACKAGE OUTLINE NJM37ADL3 FEATURES Low Dropout Voltage V I-O =.V typ. at Io=.5A Output Current Io(max.)=.A Reference Voltage Vref=.V % ON/OFF Control OFF Control Quiescent Current A max. Internal Short Circuit Current Limit Internal Overvoltage Protection Internal Thermal Overload Protection Bipolar Technology Package Outline TO-5-5 PIN CONFIGURATION GND V ADJ V OUT ON/OFF CONTROL V IN NJM37ADL3 BLOCK DIAGRAM V IN V OUT CONTROL Overvoltage Protection V ADJ Bandgap Reference GND Thermal Protection Current Limit Ver

2 ABSOLUTE MAXIMUM RATINGS (Ta=5 C) PARAMETER SYMBOL RATINGS UNIT Input Voltage V IN +35 V Control Voltage V CONT +35(*) V Adjust Terminal Voltage V ADJ + V Power Dissipation P D 9(*) 35(*3) mw Operating Junction Temperature Range Tj - +5 C Operating Temperature Range Topr - +5 C Storage Temperature Range Tstg C (*): When input voltage is less than +35V, the absolute maximum control voltage is equal to the input voltage. (*): Mounted on glass epoxy board. (7..3.mm:based on EIA/JEDEC standard size, Layers, Cu area mm ) (*3): Mounted on glass epoxy board. (7..3.mm:based on EIA/JEDEC standard, Layers) (For Layers: Applying 7. 7.mm inner Cu area and a thermal via hole to a board based on JEDEC standard JESD5-5) ELECTRICAL CHARACTERISTICS (V IN =5V, V O =V, Io=.5A, R=k, C IN =.33 F,, Tj=5 C) Measurement is conducted by pulse testing. PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNIT Input Voltage V IN V Output Voltage V O(ADJ).5 - V Reference Voltage Vref V Line Regulation Vo/ V IN V IN =V O +V V O +7V -.. %/V Load Regulation Vo/ Io V IN =V O +V,Io=A.A -.. %/A Average Temperature Coefficient of Output Voltage Vo/ T Tj= +5 C -. - %/ C Quiescent Current I Q Io=A, V CONT =.7V Except I CONT ma OFF Control Quiescent Current I Q(OFF) V CONT =V - - A Dropout Voltage V I-O Io=.5A -..5 V Ripple Rejection RR Vin=Vo+V, ein=.5vrms ein=.5vrms, f=hz db ON Control Voltage V CONT(ON).(*) - - V OFF Control Voltage V CONT(OFF) - -. V ON Control Current I CONT(ON) V C =.7V 3 5 A OFF Control Current I CONT(OFF) V C =.V 3 5 A (*): When ON/OFF CONTROL pin is open, Output Voltage is OFF. - - Ver.--5

3 THERMAL CHARACTERISTICS PARAMETER SYMBOL VALUE UNIT Junction-to-Ambient 5 (*5) ja thermal resistance (*) C/W Junction-to-Top of package 7 (*5) jt characterization parameter (*) C/W (*5): Mounted on glass epoxy board. (7..3.mm:based on EIA/JEDEC standard size, Layers, Cu area mm ) (*): Mounted on glass epoxy board. (7..3.mm:based on EIA/JEDEC standard, Layers) (For Layers: Applying 7. 7.mm inner Cu area and a thermal via hole to a board based on JEDEC standard JESD5-5) POWER DISSIPATION vs. AMBIENT TEMPERATURE Power Dissipation P D (mw) NJM37ADL3 PowerDissipation (Topr=-~+5 C,Tj=5 C) on layers board on layers board Temperature : Ta( C) TEST CIRCUIT A NJM37A 3 V IN.33µF + I QOFF I CONT V CONT A 5 A I Q R + µf R =kω A R L Io V Vo Vo = Vref ( + R/R) Ver

4 TYPICAL APPLICATION In the case where ON/OFF Control is not required: V IN V IN V OUT µF µf Rc NJM37A R V OUT CONTROL V ADJ GND R Connect control pin to V IN pin. In use of ON/OFF CONTROL: V IN V IN V OUT + + NJM37A.33µF R µf Rc V OUT CONTROL V ADJ GND R State of control pin: H output is enabled. L or open output is disabled. - - Ver.--5

5 *Feed back Resistance R The output voltage may rise against the set point by the leak current from the V OUT pin at high temperature when this resistance is set too big. Conversely, the current flowing to R grows big when R is set too small, and make the consumption current increase. From the above, recommend to k as a set range of R. *In the case of using a resistance "Rc" between V IN and control. If this resistor is inserted, it can reduce the control current when the control voltage is high. The applied voltage to control pin should set to consider voltage drop through the resistor Rc and the minimum control voltage for ON-state. The V CONT (ON) and I CONT have temperature dependence as shown in the "Control Current vs. Temperature" and " Control Voltage vs. Temperature" characteristics. Therefore, the resistance "Rc" should be selected to consider the temperature characteristics. *Input Capacitor C IN Input Capacitor C IN is required to prevent oscillation and reduce power supply ripple for applications when high power supply impedance or a long power supply line. Therefore, use the recommended C IN value (refer to conditions of ELECTRIC CHARACTERISTIC) or larger and should connect between GND and V IN as shortest path as possible to avoid the problem. *Output Capacitor C O Output capacitor (C O ) will be required for a phase compensation of the internal error amplifier. The capacitance and the equivalent series resistance (ESR) influence to stable operation of the regulator. Use of a smaller C O may cause excess output noise or oscillation of the regulator due to lack of the phase compensation. On the other hand, Use of a larger C O reduces output noise and ripple output, and also improves output transient response when rapid load change. Therefore, use the recommended C O value (refer to conditions of ELECTRIC CHARACTERISTIC) or larger and should connect between GND and V OUT as shortest path as possible for stable operation In addition, Please choose an appropriate capacitor in considering varied characteristics of capacitor (a frequency characteristic, a temperature characteristic, and so on) when selecting C O. Ver

6 TYIPICAL CHARACTERISTICS NJM37A_V Output Voltage vs. Input Voltage NJM37A_V Output Voltage vs. Output Current.5 Output Voltage : Vo(V) 9.5 Io=A Output Voltage : Vo(V) VIN=V VIN=35V VIN=V Io=.5A Io=A Input Voltage : VIN(V) Output Current : Io(A) NJM37A_V Ground Pin Current v.s. Output Current NJM37A_V Dropout Voltage vs. Output Current Ground Pin Current : IGND (ma) VIN=V R=k R=.9k Dropout Voltage:dVI-O (V).... R=k R=.9k 5 5 Output Current : IO(mA) 5 5 Output Current:Io(mA) VIN=V Io=5mA NJM37A_V Control Current vs. Control Voltage VIN=V Io=5mA NJM37A_V Output Voltage vs. Control Voltage Control Current : I ( A) Cont Rc=k Rc=5k Rc= Output Voltage : Vo(V) Rc= Rc=5k Rc=k Control Voltage : V Cont (V) Control Voltage : V Cont (V) - - Ver.--5

7 TYIPICAL CHARACTERISTICS 3 NJM37A_V Load Regulation vs. Output Current 3 NJM37A_V Peak Output Current vs. Input Voltage 5 Load Regulation : dvo-io(%/a) - - VIN=V R=k R=.9k Output Current : Io(mA) Peak Output Current : IoMAX(mA) 5 5 R=k R=.9k Vo=9V Input Voltage : VIN(V) Quiescent Current(OFF) : IQOFF (A) VCONT=V NJM37A_V Quiescent Current(OFF) vs. Input Voltage Output Noise Voltage : Vn( Vrms) 5 3 NJM37A_V Output Noise Voltage vs. Output Current VIN=V LPF:kHz Input Voltage : VIN(V)... m m m Output Current : Io(A) NJM37A_V Ripple Rejection Ratio v.s. Frequency NJM37A_V Ripple Rejection vs. Output Current 9 9 Ripple Rejection Ratio : RR (db) Io=.5A VIN=V ein=5mvrms Io=A k k k Frequency : f (Hz) Io=A Io=.A 7 5 VIN=V 3 ein=5mvrms f=hz Co=uF... Output Current : Io(mA) Ver

8 TYIPICAL CHARACTERISTICS.3.5 NJM37A_V Dropout Voltage vs. Io=.5A NJM37A_V Control Voltage vs. Temperature Dropout Voltage : dv I-O (V)..5. Control Voltage :Vcont-on Io=.5A NJM37A_V Output Voltage vs. Temperature 5 NJM37A_V Output Peak Current v.s. Temperature Output Voltage : Vo(V). 9. Output Peak Current : Io_peak (ma) NJM37A_V Quiescent Current vs. Input Voltage.5 Quiescent Current : IQ Output is open Ver.--5

9 TYIPICAL Io=.5A NJM37A_V Line Regulation vs. Io=-A NJM37A_V Load Regulation vs. Temperature Line Regulation : dvo/dio(%/v) Load Regulation : dvo/dio(%/a) Output Voltage : Io=.5A NJM37A_V Output Voltage vs. Temperature Short Circuit Current : Isc (ma) 5 3 NJM37A_V Short Circuit Current vs. VIN=V Output is short to ground Ver

10 TYIPICAL CHARACTERISTICS NJM37A_.V ON/OFF Transient Response without Load NJM37A_.V ON/OFF Transient Response Control Voltage Control Voltage Output Voltage : Vo [V] Output Voltage VDD=V Io=mA Control Voltage : Vo [V] Output Voltage : Vo [V] Output Voltage VDD=V Io=5mA Control Voltage : Vo [V] Time : t [S] - Time : t [ms].5 NJM37A_.V Input Transient Response 3 NJM37A_.V Load Transient Response 7 Output Voltage : Vo [V] Input Voltage Output Voltage VDD=V Io=5mA Time : t [ S] 9 7 Input Voltage : V IN [V] Output Voltage : Vo [V].... Output Current Output Voltage 9. VDD=V 9. Io=5mA 9. - Time : t [us] 5 3 Output Current : Io [ma] [CAUTION] The specifications on this databook are only given for information, without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. - - Ver.--5