NJM2805. Low Dropout Voltage Regulator with Reset V OUT V IN V OR GND

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1 NJM285 Low Dropout Voltage Regulator with Reset GENERAL DISCRIPTION The NJM285 is a low dropout voltage regulator with reset function. It provides up to 3mA of logic supply, and the reset function monitors output voltage of the regulator with 1% accuracy. It is suitable for local power supply and reset for small micro controller and other logic chips. FEATURES Output Voltage Accuracy Vo ±1.% Reset Voltage Accuracy V RT ±1.% Adjust reset delay time with external capacitor. Ripple Rejection 75dB typ. (f =1kHz) Output Voltage Monitor type Open Collector Output Internal Short Circuit Current Limit Internal Thermal Overload Protection Bipolar Technology Package Outline SOT-89-5 PACKAGE OUTLINE NJM285U1 PIN CONFIGURATION NJM285U1 PIN FUNCTION 1.UT 2.GND 3.Cd 4.R 5.V IN OUTPUT VOLTAGE/ DETECTION VOLTAGE Device Name UT V DET NJM285U V 2.3V NJM285U V 2.9V NJM285U V 4.3V EQUIVALENT CIRCUIT V IN UT R Bandgap Reference Thermal Protection GND Cd Ver

2 NJM285 ABSOLUTE MAXIMUM RATINGS (Ta=25 C) PARAMETER SYMBOL RATINGS UNIT Input Voltage V IN +14 V Power Dissipation P D 35 mw Operating Temperature Topr C Storage Temperature Tstg C ELECTRICAL CHARACTERISTICS (V IN =Vo+1V, C IN =.1µF, (Co=2.2µF: Vo 2.6V) Ta=25 C) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Quiescent Current I Q Io=mA µa Regulator Block Output Voltage Vo Io=3mA -1.% +1.% V Output Current Io Vo-.3V 3 4 ma Line Regulation Vo/ V IN V IN =Vo+1V Vo+6V, Io=3mA.1 %/V Load Regulation Vo/ Io Io= 3mA.3 %/ma Dropout Voltage V I_O Io=1mA.1.18 V Ripple Rejection Output Voltage Temperature Coefficient Output Noise Voltage Reset Block RR ein=2mvrms, f=1khz, Io=1mA, Vo=3V Version 75 db Vo/ T Ta= 85 C, Io=1mA ±5 ppm/ C V NO f=1hz 8kHz, Io=1mA, Vo=3V Version 45 µvrms Voltage Detection V RT V IN =H L -1.% +1.% V Hysteresis Voltage V RTH V IN =H L H Low Level Output Voltage R ORL V IN =V RT -.5V, R L =1kΩ 1 3 mv Output Leak Current I ORH V IN = V RT +.5V.1 µa On time Output Current I ORL V IN =V RT -.5V, R L =Ω 5 ma Reset Output Delay Time t d V IN =(V RT -.5V) (V RT +.5V), C d =.1µF ms Operation Voltage Limit PL RL =.4V.9 V The above specification is a common specification for all output voltages. Therefore, it may be different from the individual specification for a specific output voltage. V RT 3% V RT 5% V RT 8% V Ver

3 NJM285 TIMING CHART V IN [V] t [V] V RTH V RT t R [V] t d t d t d When the pull-up of the R is carried out to V IN through resistance. t Ver

4 NJM285 TEST CIRCUIT IQ V IN IOR VIN.1µF.1µF Cd NJM285 GND R V RL VOR 1.µF*1 (Ceramic) IOUT V VOUT *1 Vo 2.6V: Co=2.2µF (Ceramic) TYPICAL APPLICATIONS VIN V IN VOUT.1µF NJM285 1kΩ 1.µF*2 Cd GND R VOR.1µF *2 Vo 2.6V: Co=2.2µF Ver

5 NJM285 ELECTRICAL CHARISTICS 6 5 NJM285_Vo=5.V Output Voltage vs. Output Current.3.25 NJM285_5.V Dropout Voltage vs. Output Current Cd=.1µF Output Voltage :Vo [V] Dropout Voltage:dVI-O (V) VIN=6.V Co=1.µF(Ceramic) Output Current :Io [ma] Output Current:Io(mA) Output Noise Voltage : Vn(µVrms) NJM285_5.V Output Noise Voltage vs. Output Current Co=1.µF(Ceramic) Co=2.2µF(Ceramic) VIN=6.V LPF:8kHz Ground Pin Current : IGND (ma) NJM285_5.V Ground Pin Current v.s. Output Current VIN=6.V Cd=.1µF Output Current : Io(mA) Output Current : IO(mA) 25 2 NJM285_5.V Quiescent Current v.s. Input Voltage Output is open. -1 NJM285_5.V Load Regulation vs. Output Current VIN=6.V Cd=.1µF Quiescent Current : IQ (µa) Load Regulation : dvo/dio(mv) Input Voltage : VIN(V) Output Current : Io(mA) Ver

6 NJM285 ELECTRICAL CHARISTICS 1 NJM285_5.V Ripple Rejection Ratio v.s. Frequency 1 NJM285_5.V Ripple Rejection vs. Output Current Ripple Rejection Ratio : RR (db) Io=mA Io=3mA Io=1mA 3 VIN=6.V ein=2mvrms Co=1. µf(ceramic) k 1k 1k Frequency : f (Hz) Ripple Rejection : RR (db) VIN=6.V ein=2mvrms Co=1.µF(Ceramic) f=1khz f=1khz Output Current : Io(mA) Equivalent Serise Resistance : ESR( Ω) NJM285_5.V Equivalent Serise Resistance vs. Output Current Co=1.µF(Ceramic) STABLE REGION Dropout Voltage:dVI-O (V) NJM285_5.V/4.3V Dropout Voltage v.s. Io=1mA Output Current : Io(mA) Output Leak Current : I ORH (µa) NJM285_5.V/4.3V Output Leak Current v.s Temperature VIN=4.8V Cd=.1µF RL=1k Ω ON Output Current : IORL(mA) NJM285_5.V/4.3V ON Output Current v.s Temperature VIN=3.8V Cd=.1µF RL=Ω Temperature : Ta( o C) Temperature : Ta( o C) Ver

7 NJM285 ELECTRICAL CHARISTICS 4 NJM285_5.V/4.3V Quiescent Current v.s. Temperature 4 NJM285_5.V/4.3V Short Circuit Current v.s. Temperature 35 Output is short to ground. CO=1µF(Ceramic) Quiescent Current : IQ (µa) Output is open. CL=1µF(Ceramic) Short Circuit Current : ISC (ma) NJM285_5.V/4.3V Line Regulation v.s. I o=3ma.3.25 NJM285_5.V/4.3V Load Regulation v.s. I o=-3ma Line Regulation : dvo/dio (%/V) Load Regulation : dvo/dio (%/ma) NJM285_5.V/4.3V Reset Output Delay Time v.s Temperature VIN=3.8V->4.8V Cd=.1µF NJM285_5.V/4.3V Output Voltage v.s Temperature VIN=6.V Io=3mA Reset Output Delay Time:td(ms) Output Votage:Vo(V) Ver

8 NJM285 ELECTRICAL CHARISTICS Operation Voltage Limit : VOPL(V) NJM285_5.V/4.3V Operation Voltage Limit v.s Temperature VORL=.4V Cd=.1µF Low Level Output Voltage : VORL(mV) NJM285_5.V/4.3V Low Level Voltage v.s Temperature VIN=3.8V Cd=.1µF RL=1kΩ NJM285_5.V/4.3V Voltage Detection v.s Temperature VIN=H->L Cd=.1µF 4 NJM285_5.V/4.3V Hysteresis Voltage v.s Temperature VIN=H->L->H Co=1mF Cd=.1mF Voltage Detection : VRT(V) Hysteresis Voltage : VRT(mV) Ver

9 NJM285 [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