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ME431V03Page1of12AdjustablePrecisionShuntRegulatorGeneralDescriptionFeaturesSelectionGuideTheME431seriesICsarethree-terminaladjustableshuntregulatorswithguaranteedthermalstabilityoverafulloperationrange.TheseICsfeaturesharpturn-oncharacteristics,lowtemperaturecoefficientandlowoutputimpedance,whichmakethemidealsubstitutesforZenerdiodesinapplicationssuchasswitchingpowersupply,chargerandotheradjustableregulators.TheME431voltagetypeis40V.TheoutputvoltagecanbesettoanyvaluebetweenVREF(2.5V)andthecorrespondingmaximumcathodevoltage.TheME431precisionreferenceisofferedintwobandgaptolerance:0.4%and1.0%.●ProgrammablePreciseOutputVoltagefrom2.5Vto36V●VeryAccurateReferenceVoltage:Typical0.15%●HighStabilityunderCapacitiveLoad●LowTemperatureDeviation:Typical4.5mV●LowEquivalentFull-rangeTemperatureCoefficientwith20PPM/℃Typical●LowDynamicOutputResistance:Typical0.2Ω●SinkCurrentCapacityfrom1mAto100mA●LowOutputNoise●WideOperatingRangeof-40to150℃●TO-92,SOT23-3,SOT23packageTypicalApplication●Charger●VoltageAdapter●SwitchingPowerSupply●GraphicCard●PrecisionVoltageReferenceSelectionGuideQ、235555846013620971652ME431V03Page2of12PINConfigurationBlockDiagramandsymbolAbsoluteMaximumRatingsPARAMETERSYMBALRATINGUNITCathodevoltageVKA40VCathodecurrentrange(continuous)IKA-100to+130mAReferenceinputcurrentrangeIREF10mAPowerDissipationPDTO-92Package:770mWSOT23-3Package:370SOT23Package:300JunctiontemperatureTJ160℃StorageTemperaturerangeTSTG-65~+150℃PackagethermalimpedanceθJATO-92package:150℃/WSOT23-3package:330SOT23package:350Note:UsethisICwithinthestatedmaximumratings.Operationbeyondtheselimitsmaycausedegradingorpermanentdamagetothedevice.TO-92CATHODEREFANODEVREFCATHODEREFANODESOT23-3SOT23Q、235555846013620971652ME431V03Page3of12RecommendedOperatingConditionsParameterSymbolMinMaxUnitCathodeVoltageVKAVREF36VCathodeCurrentIKA1.0100mAOperatingAmbientTemperatureRange-40125℃ElectricalCharacteristics(TA=25℃,unlessotherwisenoted)ParameterSymbolConditionsMinTyp.MaxUnitTestcircuitReferencevoltage0.4%VREFVKA=VREF,IKA=10mA2.4902.502.510VFig.11.0%2.4752.502.525Deviationofreferencevoltageover-temperature∆VREFVKA=VREF,IKA=10mA0to70℃-310mVFig.1-40to150℃-315DynamicimpedanceKA|Z|VKA=VREF,IKA=1to100mA,f≤1.0KHz-0.150.5ΩFig.1MinimumcathodecurrentforregulationIKA(MIN)VKA=VREF-0.41.0mAFig.1RatioofchangeinreferencevoltagetothechangeincathodevoltageREFKAΔVΔVIKA=10mAΔVKA=10VtoVREF--0.8-2.5mV/VFig.2ΔVKA=36Vto10V--0.6-1.5ReferencecurrentIREFIKA=10mA,R1=10KΩ,R2=∝0.73μAFig.2Deviationofreferenceoverfulltemperaturerange∆IREFIKA=10mA,R1=10KΩ,R2=∝,TA=40to150℃0.11.2μAFig.2Off-statecathodecurrentIKA(OFF)VKA=36V,VREF=00.030.3μAFig.3Note:Thedynamicimpedanceisdefinedas:KA|Z|=△VKA/△IKAKAREFREFV=V(1+R1/R2)+IR1Fig.1:forVKA=VREFFig.2:forVKA>VREFFig.3:forIOFFR1VINVKAIKAVREFVINVKAIKAVREFR1R2R3R1VINVKAIOFFQ、235555846013620971652ME431V03Page4of12TypicalPerformanceCharacteristicsVKA=VREFIKA=10mAVKA=36VVREF=0R1=10KΩIKA=10mAVKA=VREFTA=25℃VKA=VREFTA=25℃VKA=3.5Vto36VQ、235555846013620971652ME431V03Page5of12SmallSignalVoltageGainvs.FrequencyReferenceImpedancevs.FrequencyStabilityBoundaryConditionsvs.LoadCapacitance10μF15K8.2K242ΩIKAGNDME431GNDOutputOutputIKA1K50ΩR110KR2IKA150ΩME431Q、235555846013620971652ME431V03Page6of12PulseResponseofInputandOutputVoltageTypicalApplicationFig.4:ShuntRegulatorFig.5:HighCurrentShuntRegulatorGNDOutput220Ω50ΩF=100KHzGeneratorPulseVINR3R1R2VREFVOUTME431VO=(1+R1/R2)VREFVINR1R2R3VREFME431R4VOUTVO=(1+R2/R3)VREFQ、235555846013620971652ME431V03Page7of12Fig.6:CurrentSourceorCurrentLimitFig.7:Precision5V1.5ARegulatorVINR1R2ME431IOUTIOUT=VREF/R2+IKAVINR18.2KR2250ΩR3250ΩVOUT5V,1.5AME431ME1117Q、235555846013620971652ME431V03Page8of12PackagingType:TO-92MinMaxMinMaxA3.43.80.133860.1496B0.30.50.01180.0197C4.44.80.17320.189D4.44.80.17320.189E0.91.50.03540.059e1.171.370.0460.0539e12.392.690.0940.1059L12160.47240.6299Q、235555846013620971652ME431V03Page9of12PackagingType:TO-92(PaperTape)单位：mmQ、235555846013620971652ME431V03Page10of12PackagingType:SOT23-3DIMMillimetersInchesMinMaxMinMaxA2.73.10.10630.122B1.72.10.06690.0827b0.350.50.01380.0197C1.01.20.03940.0472c0.10.250.00390.0098d0.2-0.0079-E2.63.00.10230.1181e1.51.80.0590.0708Q、235555846013620971652ME431V03Page11of12PackagingType:SOT23DIMMillimetersInchesMinMaxMinMaxA2.73.10.10630.122B1.72.10.06690.0827b0.350.50.01380.0197C1.01.20.03940.0472c0.10.250.00390.0098d0.2-0.0079-E2.12.640.08270.1039e1.21.40.04720.0551Q、235555846013620971652