LM2596S-5.0五端稳压集成块

LM2596SIMPLESWITCHER®PowerConverter150kHz3AStep-DownVoltageRegulatorGeneralDescriptionTheLM2596seriesofregulatorsaremonolithicintegratedcircuitsthatprovidealltheactivefunctionsforastep-down(buck)switchingregulator,capableofdrivinga3Aloadwithexcellentlineandloadregulation.Thesedevicesareavail-ableinfixedoutputvoltagesof3.3V,5V,12V,andanadjust-ableoutputversion.Requiringaminimumnumberofexternalcomponents,theseregulatorsaresimpletouseandincludeinternalfrequencycompensation†,andafixed-frequencyoscillator.TheLM2596seriesoperatesataswitchingfrequencyof150kHzthusallowingsmallersizedfiltercomponentsthanwhatwouldbeneededwithlowerfrequencyswitchingregu-lators.Availableinastandard5-leadTO-220packagewithseveraldifferentleadbendoptions,anda5-leadTO-263surfacemountpackage.AstandardseriesofinductorsareavailablefromseveraldifferentmanufacturersoptimizedforusewiththeLM2596series.Thisfeaturegreatlysimplifiesthedesignofswitch-modepowersupplies.Otherfeaturesincludeaguaranteed±4%toleranceonout-putvoltageunderspecifiedinputvoltageandoutputloadconditions,and±15%ontheoscillatorfrequency.Externalshutdownisincluded,featuringtypically80μAstandbycur-rent.Selfprotectionfeaturesincludeatwostagefrequencyreducingcurrentlimitfortheoutputswitchandanovertemperatureshutdownforcompleteprotectionunderfaultconditions.Featuresn3.3V,5V,12V,andadjustableoutputversionsnAdjustableversionoutputvoltagerange,1.2Vto37V±4%maxoverlineandloadconditionsnAvailableinTO-220andTO-263packagesnGuaranteed3AoutputloadcurrentnInputvoltagerangeupto40VnRequiresonly4externalcomponentsnExcellentlineandloadregulationspecificationsn150kHzfixedfrequencyinternaloscillatornTTLshutdowncapabilitynLowpowerstandbymode,IQtypically80μAnHighefficiencynUsesreadilyavailablestandardinductorsnThermalshutdownandcurrentlimitprotectionApplicationsnSimplehigh-efficiencystep-down(buck)regulatornOn-cardswitchingregulatorsnPositivetonegativeconverterNote:†PatentNumber5,382,918.TypicalApplication(FixedOutputVoltageVersions)01258301SIMPLESWITCHER®andSwitchersMadeSimple®areregisteredtrademarksofNationalSemiconductorCorporation.May2002LM2596SIMPLESWITCHERPowerConverter150kHz3AStep-DownVoltageRegulator©2002NationalSemiconductorCorporationDS012583(T)SurfaceMountPackage5-LeadTO-263(S)01258302OrderNumberLM2596T-3.3,LM2596T-5.0,LM2596T-12orLM2596T-ADJSeeNSPackageNumberT05D01258303OrderNumberLM2596S-3.3,LM2596S-5.0,LM2596S-12orLM2596S-ADJSeeNSPackageNumberTS5BLM2596(Note1)IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheNationalSemiconductorSalesOffice/Distributorsforavailabilityandspecifications.MaximumSupplyVoltage45VON/OFFPinInputVoltage−0.3≤V≤+25VFeedbackPinVoltage−0.3≤V≤+25VOutputVoltagetoGround(SteadyState)−1VPowerDissipationInternallylimitedStorageTemperatureRange−65˚Cto+150˚CESDSusceptibilityHumanBodyModel(Note2)2kVLeadTemperatureSPackageVaporPhase(60sec.)+215˚CInfrared(10sec.)+245˚CTPackage(Soldering,10sec.)+260˚CMaximumJunctionTemperature+150˚COperatingConditionsTemperatureRange−40˚C≤TJ≤+125˚CSupplyVoltage4.5Vto40VLM2596-3.3ElectricalCharacteristicsSpecificationswithstandardtypefaceareforTJ=25˚C,andthosewithboldfacetypeapplyoverfullOperatingTempera-tureRangeSymbolParameterConditionsLM2596-3.3Units(Limits)Typ(Note3)Limit(Note4)SYSTEMPARAMETERS(Note5)TestCircuitFigure1VOUTOutputVoltage4.75V≤VIN≤40V,0.2A≤ILOAD≤3A3.3V3.168/3.135V(min)3.432/3.465V(max)ηEfficiencyVIN=12V,ILOAD=3A73%LM2596-5.0ElectricalCharacteristicsSpecificationswithstandardtypefaceareforTJ=25˚C,andthosewithboldfacetypeapplyoverfullOperatingTempera-tureRangeSymbolParameterConditionsLM2596-5.0Units(Limits)Typ(Note3)Limit(Note4)SYSTEMPARAMETERS(Note5)TestCircuitFigure1VOUTOutputVoltage7V≤VIN≤40V,0.2A≤ILOAD≤3A5.0V4.800/4.750V(min)5.200/5.250V(max)ηEfficiencyVIN=12V,ILOAD=3A80%LM2596-12ElectricalCharacteristicsSpecificationswithstandardtypefaceareforTJ=25˚C,andthosewithboldfacetypeapplyoverfullOperatingTempera-tureRangeSymbolParameterConditionsLM2596-12Units(Limits)Typ(Note3)Limit(Note4)SYSTEMPARAMETERS(Note5)TestCircuitFigure1VOUTOutputVoltage15V≤VIN≤40V,0.2A≤ILOAD≤3A12.0V11.52/11.40V(min)12.48/12.60V(max)ηEfficiencyVIN=25V,ILOAD=3A90%LM2596=25˚C,andthosewithboldfacetypeapplyoverfullOperatingTempera-tureRangeSymbolParameterConditionsLM2596-ADJUnits(Limits)Typ(Note3)Limit(Note4)SYSTEMPARAMETERS(Note5)TestCircuitFigure1VFBFeedbackVoltage4.5V≤VIN≤40V,0.2A≤ILOAD≤3A1.230VVOUTprogrammedfor3V.CircuitofFigure11.193/1.180V(min)1.267/1.280V(max)ηEfficiencyVIN=12V,VOUT=3V,ILOAD=3A73%AllOutputVoltageVersionsElectricalCharacteristicsSpecificationswithstandardtypefaceareforTJ=25˚C,andthosewithboldfacetypeapplyoverfullOperatingTempera-tureRange.Unlessotherwisespecified,VIN=12Vforthe3.3V,5V,andAdjustableversionandVIN=24Vforthe12Vver-sion.ILOAD=500mASymbolParameterConditionsLM2596-XXUnits(Limits)Typ(