LM2940

LM2940/LM2940C1ALowDropoutRegulatorGeneralDescriptionTheLM2940/LM2940Cpositivevoltageregulatorfeaturestheabilitytosource1Aofoutputcurrentwithadropoutvolt-ageoftypically0.5Vandamaximumof1Vovertheentiretemperaturerange.Furthermore,aquiescentcurrentreduc-tioncircuithasbeenincludedwhichreducesthegroundcur-rentwhenthedifferentialbetweentheinputvoltageandtheoutputvoltageexceedsapproximately3V.Thequiescentcurrentwith1Aofoutputcurrentandaninput-outputdiffer-entialof5Visthereforeonly30mA.Higherquiescentcur-rentsonlyexistwhentheregulatorisinthedropoutmode(VIN−VOUT≤3V).Designedalsoforvehicularapplications,theLM2940/LM2940Candallregulatedcircuitryareprotectedfromre-versebatteryinstallationsor2-batteryjumps.Duringlinetransients,suchasloaddumpwhentheinputvoltagecanmomentarilyexceedthespecifiedmaximumoperatingvolt-age,theregulatorwillautomaticallyshutdowntoprotectboththeinternalcircuitsandtheload.TheLM2940/LM2940Ccannotbeharmedbytemporarymirror-imagein-sertion.Familiarregulatorfeaturessuchasshortcircuitandthermaloverloadprotectionarealsoprovided.FeaturesnDropoutvoltagetypically0.5V@IO=1AnOutputcurrentinexcessof1AnOutputvoltagetrimmedbeforeassemblynReversebatteryprotectionnInternalshortcircuitcurrentlimitnMirrorimageinsertionprotectionnP+ProductEnhancementtestedTypicalApplicationOrderingInformationTemperatureRangeOutputVoltagePackage5.08.09.01012150˚C≤TA≤125˚CLM2940CT-5.0LM2940CT-9.0LM2940CT-12LM2940CT-15TO-220LM2940CS-5.0LM2940CS-9.0LM2940CS-12LM2940CS-15TO-263−40˚C≤TA≤125˚CLM2940T-5.0LM2940T-8.0LM2940T-9.0LM2940T-10LM2940T-12TO-220LM2940S-5.0LM2940S-8.0LM2940S-9.0LM2940S-10LM2940S-12TO-263−40˚C≤TA≤85˚CLM2940IMP-5.0LM2940IMP-8.0LM2940IMP-9.0LM2940IMP-10LM2940IMP-12LM2940IMP-15SOT-223SOT-223PackageMarkingL53BL54BL0EBL55BL56BL70B−55˚C≤TA≤125˚CLM2940K-5.0/883LM2940K-8.0/883LM2940K-12/883LM2940K-15/883TO-3ThephysicalsizeoftheSOT-223istoosmalltocontainthefulldevicepartnumber.Thepackagemarkingsindicatedarewhatwillappearontheactualdevice.DS008822-3*Requiredifregulatorislocatedfarfrompowersupplyfilter.**COUTmustbeatleast22μFtomaintainstability.Maybeincreasedwithoutboundtomaintainregulationduringtransients.Locateascloseaspossibletotheregulator.ThiscapacitormustberatedoverthesameoperatingtemperaturerangeastheregulatorandtheESRiscritical;seecurve.December1997LM2940/LM2940C1ALowDropoutRegulator©1997NationalSemiconductorCorporationDS008822(Notes2,1)IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheNationalSemiconductorSalesOffice/Distributorsforavailabilityandspecifications.LM2940S,T,IMP≤100ms60VLM2940K/883≤20ms40VLM2940CS,T≤1ms45VInternalPowerDissipation(Note3)InternallyLimitedMaximumJunctionTemperature150˚CStorageTemperatureRange−65˚C≤TJ≤+150˚CLeadTemperature,TimeforWaveSolderingTO-3(K)Package300˚C,10sTO-220(T)Package260˚C,10sTO-263(S)Package260˚C,4sSOT-223(IMP)Package260˚C,4sESDSusceptibility(Note4)2kVOperatingConditions(Note1)InputVoltage26VTemperatureRangeLM2940K/883−55˚C≤TA≤125˚CLM2940T,LM2940S−40˚C≤TA≤125˚CLM2940CT,LM2940CS0˚C≤TA≤125˚CLM2940IMP−40˚C≤TA≤85˚CElectricalCharacteristicsVIN=VO+5V,IO=1A,CO=22μF,unlessotherwisespecified.Boldfacelimitsapplyovertheentireoperatingtempera-turerangeoftheindicateddevice.AllotherspecificationsapplyforTA=TJ=25˚COutputVoltage(VO)5V8VUnitsLM2940LM2940/883LM2940LM2940/883ParameterConditionsTypLimitLimitTypLimitLimit(Note5)(Note6)(Note5)(Note6)6.25V≤VIN≤26V9.4V≤VIN≤26VOutputVoltage5mA≤IO≤1A5.004.85/4.754.85/4.758.007.76/7.607.76/7.60VMIN5.15/5.255.15/5.258.24/8.408.24/8.40VMAXLineRegulationVO+2V≤VIN≤26V,205040/50208050/80mVMAXIO=5mALoadRegulation50mA≤IO≤1ALM2940,LM2940/8833550/8050/1005580/13080/130mVMAXLM2940C35505580Output100mADCandImpedance20mArms,351000/1000551000/1000mΩfO=120HzQuiescentVO+2V≤VIN≤26V,CurrentIO=5mALM2940,LM2940/8831015/2015/201015/2015/20mAMAXLM2940C1015VIN=VO+5V,3045/6050/603045/6050/60mAMAXIO=1AOutputNoise10Hz−100kHz,150700/7002401000/1000μVrmsVoltageIO=5mARippleRejectionfO=120Hz,1Vrms,IO=100mALM29407260/546654/48dBMINLM2940C72606654fO=1kHz,1Vrms,60/5054/48dBMINIO=5mALongTerm2032mV/Stability1000HrDropoutVoltageIO=1A0.50.8/1.00.7/1.00.50.8/1.00.7/1.0VMAXIO=100mA110150/200150/200110150/200150/200mVMAXShortCircuitCurrent(Note7)1.91.61.5/1.31.91.61.6/1.3AMIN(Continued)VIN=VO+5V,IO=1A,CO=22μF,unlessotherwisespecified.Boldfacelimitsapplyovertheentireoperatingtempera-turerangeoftheindicateddevice.AllotherspecificationsapplyforTA=TJ=25˚COutputVoltage(VO)5V8VUnitsLM2940LM2940/883LM2940LM2940/883ParameterConditionsTypLimitLimitTypLimitLimit(Note5)(Note6)(Note5)(Note6)MaximumLineRO=100ΩVMINTransientLM2940,T≤100ms7560/607560/60LM2940/883,T≤20ms40/4040/40LM2940C,T≤1ms55455545ReversePolarityRO=100ΩDCInputVoltageLM2940,LM2940/883−30−15/−15−15/−15−30−15/−15−15/−15VMINLM2940C−30−15−30−15ReversePolarityRO=100ΩTransientInputLM2940,T≤100ms−75−50/−50−75−50/−50VMINVoltageLM2940/883,T≤20ms−45/−45−45/−45LM2940C,T≤1ms−55−45/−45ElectricalCharacteristicsVIN=VO+5V,IO=1A,CO=22μF,unlessotherwisespecified.Boldface