lm2940(lm2940C)Datasheet(英文版)

LM2940/LM2940C1ALowDropoutRegulatorGeneralDescriptionTheLM2940/LM2940Cpositivevoltageregulatorfeaturestheabilitytosource1Aofoutputcurrentwithadropoutvoltageoftypically0.5Vandamaximumof1Vovertheentiretemperaturerange.Furthermore,aquiescentcurrentreductioncircuithasbeenincludedwhichreducesthegroundcurrentwhenthedifferentialbetweentheinputvolt-ageandtheoutputvoltageexceedsapproximately3V.Thequiescentcurrentwith1Aofoutputcurrentandaninput-outputdifferentialof5Visthereforeonly30mA.Higherquiescentcurrentsonlyexistwhentheregulatorisinthedropoutmode(VIN−VOUT≤3V).Designedalsoforvehicularapplications,theLM2940/LM2940Candallregulatedcircuitryareprotectedfromre-versebatteryinstallationsor2-batteryjumps.Duringlinetransients,suchasloaddumpwhentheinputvoltagecanmomentarilyexceedthespecifiedmaximumoperatingvolt-age,theregulatorwillautomaticallyshutdowntoprotectboththeinternalcircuitsandtheload.TheLM2940/LM2940Ccannotbeharmedbytemporarymirror-imagein-sertion.Familiarregulatorfeaturessuchasshortcircuitandthermaloverloadprotectionarealsoprovided.FeaturesnDropoutvoltagetypically0.5V@IO=1AnOutputcurrentinexcessof1AnOutputvoltagetrimmedbeforeassemblynReversebatteryprotectionnInternalshortcircuitcurrentlimitnMirrorimageinsertionprotectionnP+ProductEnhancementtestedTypicalApplication00882203*Requiredifregulatorislocatedfarfrompowersupplyfilter.**COUTmustbeatleast22µFtomaintainstability.Maybeincreasedwithoutboundtomaintainregulationduringtransients.Locateascloseaspossibletotheregulator.ThiscapacitormustberatedoverthesameoperatingtemperaturerangeastheregulatorandtheESRiscritical;seecurve.OrderingInformationTemperatureRangeOutputVoltagePackage5.08.09.01012150˚C≤TJ≤125˚CLM2940CT-5.0LM2940CT-9.0LM2940CT-12LM2940CT-15TO-220LM2940CS-5.0LM2940CS-9.0LM2940CS-12LM2940CS-15TO-263−40˚C≤TJ≤125˚CLM2940LD-5.0LM2940LD-8.0LM2940LD-9.0LM2940LD-10LM2940LD-12LM2940LD-15LLP1kUnitsTapeandReelLM2940LDX-5.0LM2940LDX-8.0LM2940LDX-9.0LM2940LDX-10LM2940LDX-12LM2940LDX-15LLP4.5kUnitsTapeandReel−40˚C≤TJ≤125˚CLM2940T-5.0LM2940T-8.0LM2940T-9.0LM2940T-10LM2940T-12TO-220LM2940S-5.0LM2940S-8.0LM2940S-9.0LM2940S-10LM2940S-12TO-263−40˚C≤TJ≤85˚CLM2940IMP-5.0LM2940IMP-8.0LM2940IMP-9.0LM2940IMP-10LM2940IMP-12LM2940IMP-15SOT-223LM2940IMPX-5.0LM2940IMPX-8.0LM2940IMPX-9.0LM2940IMPX-10LM2940IMPX-12LM2940IMPX-15SOT-223inTapeandReelSOT-223PackageMarkingL53BL54BL0EBL55BL56BL70BThephysicalsizeoftheSOT-223istoosmalltocontainthefulldevicepartnumber.Thepackagemarkingsindicatedarewhatwillappearontheactualdevice.January2003LM2940/LM2940C1ALowDropoutRegulator©2003NationalSemiconductorCorporationDS008822(Continued)TemperatureRangeOutputVoltagePackage5.08.01215−55˚C≤TJ≤125˚CLM2940J-5.0/8835962-8958701EALM2940J-8.0/8835962-9088301QEALM2940J-12/8835962-9088401QEALM2940J-15/8835962-9088501QEAJ16ALM2940WG5.0/8835962-8958701XAWG16AForinformationonmilitarytemperaturerangeproducts,pleasegototheMil/AeroWebSiteat(TO-220)PlasticPackage3-LeadSOT-22300882202FrontViewOrderNumberLM2940CT-5.0,LM2940CT-9.0,LM2940CT-12,LM2940CT-15,LM2940T-5.0,LM2940T-8.0,LM2940T-9.0,LM2940T-10orLM2940T-12SeeNSPackageNumberTO3B00882242FrontViewOrderPartNumberLM2940IMP-5.0,LM2940IMP-8.0,LM2940IMP-9.0,LM2940IMP-10,LM2940IMP-12orLM2940IMP-15SeeNSPackageNumberMP04A16-LeadDual-in-LinePackage(J)00882243TopViewOrderNumberLM2940J-5.0/883(5962-8958701EA),LM2940J-8.0/883(5962-9088301QEA),LM2940J-12/883(5962-9088401QEA),LM2940J-15/883(5962-9088501QEA)SeeNSPackageNumberJ16A16-LeadCeramicSurface-MountPackage(WG)00882244TopViewOrderNumberLM2940WG5.0/883(5962-8958701XA)SeeNSPackageNumberWG16ALM2940/LM2940C(Continued)(TO-263)Surface-MountPackage00882211TopView8-LeadLLP00882246TopViewOrderNumberLM2940LD-5.0,LM2940LD-8.0,LM2940LD-9.0,LM2940LD-10,LM2940LD-12,LM2940LD-15SeeNSPackageNumberLDC08APin2andpin7arefusedtocenterDAPPin5ans6needtobetiedtogetheronPCBboard00882212SideViewOrderNumberLM2940CS-5.0,LM2940CS-9.0,LM2940CS-12,LM2940CS-15,LM2940S-5.0,LM2940S-8.0,LM2940S-9.0,LM2940S-10orLM2940S-12SeeNSPackageNumberTS3BLM2940/LM2940C(Note1)IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheNationalSemiconductorSalesOffice/Distributorsforavailabilityandspecifications.LM2940S,T,MP≤100ms60VLM2940CS,T≤1ms45VInternalPowerDissipation(Note2)InternallyLimitedMaximumJunctionTemperature150˚CStorageTemperatureRange−65˚C≤TJ≤+150˚CLeadTemperature,TimeforWaveSolderingTO-220(T)Package260˚C,10sTO-263(S)Package260˚C,4sSOT-223(MP)Package260˚C,4sESDSusceptibility(Note3)2kVOperatingConditions(Note1)InputVoltage26VTemperatureRangeLM2940T,LM2940S−40˚C≤TJ≤125˚CLM2940CT,LM2940CS0˚C≤TJ≤125˚CLM2940IMP−40˚C≤TJ≤85˚CLM2940J,LM2940WG−55˚C≤TJ≤125˚CLM2940LD−40˚C≤TJ≤125˚CElectricalCharacteristicsVIN=VO+5V,IO=1A,CO=22µF,unlessotherwisespecified.Boldfacelimitsapplyovertheentireoperatingtempera-turerangeoftheindicateddevice.AllotherspecificationsapplyforTA=TJ=25˚C.OutputVoltage(VO)5V8VUnitsL