LM2576-3.3 datasheet

DeviceOperatingTemperatureRangePackageEASYSWITCHER3.0ASTEP–DOWNVOLTAGEREGULATORORDERINGINFORMATIONLM2576T–XXLM2576TV–XXTJ=–40°to+125°CStraightLeadVerticalMountD2TSUFFIXPLASTICPACKAGECASE936A(D2PAK)OrderthisdocumentbyLM2576/DTSUFFIXPLASTICPACKAGECASE314DTVSUFFIXPLASTICPACKAGECASE314BLM2576D2T–XXSurfaceMountXX=VoltageOption,i.e.3.3,5,12,15V;andADJforAdjustableOutput.SEMICONDUCTORTECHNICALDATA151515DEVICETYPE/NOMINALOUTPUTVOLTAGELM2576–3.3LM2576–5LM2576–12LM2576–15LM2576–ADJ3.3V5.0V12V15V1.23Vto37VPin1.Vin2.Output3.Ground4.Feedback5.ON/OFFHeatsinksurfaceconnectedtoPin3.Heatsinksurface(shownasterminal6incaseoutlinedrawing)isconnectedtoPin3.1MOTOROLAANALOGICDEVICEDATA!TheLM2576seriesofregulatorsaremonolithicintegratedcircuitsideallysuitedforeasyandconvenientdesignofastep–downswitchingregulator(buckconverter).Allcircuitsofthisseriesarecapableofdrivinga3.0Aloadwithexcellentlineandloadregulation.Thesedevicesareavailableinfixedoutputvoltagesof3.3V,5.0V,12V,15V,andanadjustableoutputversion.Theseregulatorsweredesignedtominimizethenumberofexternalcomponentstosimplifythepowersupplydesign.StandardseriesofinductorsoptimizedforusewiththeLM2576areofferedbyseveraldifferentinductormanufacturers.SincetheLM2576converterisaswitch–modepowersupply,itsefficiencyissignificantlyhigherincomparisonwithpopularthree–terminallinearregulators,especiallywithhigherinputvoltages.Inmanycases,thepowerdissipatedissolowthatnoheatsinkisrequiredoritssizecouldbereduceddramatically.AstandardseriesofinductorsoptimizedforusewiththeLM2576areavailablefromseveraldifferentmanufacturers.Thisfeaturegreatlysimplifiesthedesignofswitch–modepowersupplies.TheLM2576featuresincludeaguaranteed±4%toleranceonoutputvoltagewithinspecifiedinputvoltagesandoutputloadconditions,and±10%ontheoscillatorfrequency(±2%over0°Cto125°C).Externalshutdownisincluded,featuring80μA(typical)standbycurrent.Theoutputswitchincludescycle–by–cyclecurrentlimiting,aswellasthermalshutdownforfullprotectionunderfaultconditions.Features•3.3V,5.0V,12V,15V,andAdjustableOutputVersions•AdjustableVersionOutputVoltageRange,1.23to37V±4%MaximumOverLineandLoadConditions•Guaranteed3.0AOutputCurrent•WideInputVoltageRange•RequiresOnly4ExternalComponents•52kHzFixedFrequencyInternalOscillator•TTLShutdownCapability,LowPowerStandbyMode•HighEfficiency•UsesReadilyAvailableStandardInductors•ThermalShutdownandCurrentLimitProtectionApplications•SimpleHigh–EfficiencyStep–Down(Buck)Regulator•EfficientPre–RegulatorforLinearRegulators•On–CardSwitchingRegulators•PositivetoNegativeConverter(Buck–Boost)•NegativeStep–UpConverters•PowerSupplyforBatteryChargersMotorola,Inc.1999Rev1,07/1999LM25762MOTOROLAANALOGICDEVICEDATAFigure1.BlockDiagramandTypicalApplication7.0V–40VUnregulatedDCInputL1100μHGnd+Vin1Cin100μF3ON/OFF5Output2Feedback4D11N5822Cout1000μFTypicalApplication(FixedOutputVoltageVersions)RepresentativeBlockDiagramandTypicalApplicationUnregulatedDCInput+Vin1CoutFeedback4CinL1D1R2R11.0kOutput2Gnd3ON/OFF5ResetLatchThermalShutdown52kHzOscillator1.235VBand–GapReferenceFreqShift18kHzComparatorFixedGainErrorAmplifierCurrentLimitDriver1.0AmpSwitchON/OFF3.1VInternalRegulatorRegulatedOutputVoutLoadOutputVoltageVersions3.3V5.0V12V15VR2(Ω)1.7k3.1k8.84k11.3kForadjustableversionR1=open,R2=0ΩLM25765.0VRegulatedOutput3.0ALoadABSOLUTEMAXIMUMRATINGS(AbsoluteMaximumRatingsindicatelimitsbeyondwhichdamagetothedevicemayoccur.)RatingSymbolValueUnitMaximumSupplyVoltageVin45VON/OFFPinInputVoltage––0.3V≤V≤+VinVOutputVoltagetoGround(Steady–State)––1.0VPowerDissipationCase314Band314D(TO–220,5–Lead)PDInternallyLimitedWThermalResistance,Junction–to–AmbientRθJA65°C/WThermalResistance,Junction–to–CaseRθJC5.0°C/WCase936A(D2PAK)PDInternallyLimitedWThermalResistance,Junction–to–AmbientRθJA70°C/WThermalResistance,Junction–to–CaseRθJC5.0°C/WStorageTemperatureRangeTstg–65to+150°CMinimumESDRating(HumanBodyModel:C=100pF,R=1.5kΩ)–2.0kVLeadTemperature(Soldering,10seconds)–260°CMaximumJunctionTemperatureTJ150°CNOTE:ESDdataavailableuponrequest.LM25763MOTOROLAANALOGICDEVICEDATAOPERATINGRATINGS(OperatingRatingsindicateconditionsforwhichthedeviceisintendedtobefunctional,butdonotguaranteespecificperformancelimits.Forguaranteedspecificationsandtestconditions,seetheElectricalCharacteristics.)RatingSymbolValueUnitOperatingJunctionTemperatureRangeTJ–40to+125°CSupplyVoltageVin40VSYSTEMPARAMETERS([Note1]TestCircuitFigure15)ELECTRICALCHARACTERISTICS(Unlessotherwisespecified,Vin=12Vforthe3.3V,5.0V,andAdjustableversion,Vin=25Vforthe12Vversion,andVin=30Vforthe15Vversion.ILoad=500mA.FortypicalvaluesTJ=25°C,formin/maxvaluesTJistheoperatingjunctiontemperaturerangethatapplies[Note2],unlessotherwisenoted.)CharacteristicsSymbolMinTypMaxUnitLM2576–3.3([Note1]TestCircuitFigure15)OutputVoltage(Vin=12V,ILoad=0.5A,TJ=25°C)Vout3.2343.33.366VOutputVoltage(6.0V≤Vin≤40V,0.5A≤ILoad≤3.0A)VoutVTJ=25°C3.1683.33.432TJ=–40to+125°C3.135–3.465Efficiency(Vin=12V,ILoad=3.0A)η–75–%LM2576–5([Note1]TestCircuitFigure15)OutputVoltage(Vin=12V,ILoad=0.5A,TJ=25°C)V