LP38501

LP38501/3-ADJ,LP38501A/3A-ADJOctober30,20093AFlexCapLowDropoutLinearRegulatorfor2.7Vto5.5VInputsGeneralDescriptionNational'sFlexCapLDO'sfeatureuniquecompensationthatallowstheuseofanytypeofoutputcapacitorwithnolimitsonminimumormaximumESR.TheLP38501/3seriesoflow-dropoutlinearregulatorsoperatesfroma+2.7Vto+5.5Vinputsupply.Theseultralowdropoutlinearregulatorsrespondveryquicklytostepchangesinload,whichmakesthemsuitableforlowvoltagemicroprocessorapplications.DevelopedonaCMOSprocess,(utilizingaPMOSpasstransistor),theLP38501/3haslowquiescentcurrentthatchangeslittlewithloadcurrent.GroundPinCurrent:Typically2mAat3Aloadcurrent.DisableMode:Typically25nAquiescentcurrentwhentheEnablepinispulledlow.SimplifiedCompensation:Stablewithanytypeofoutputcapacitor,regardlessofESR.PrecisionOutput:Agradeversionsavailablewith1.5%VADJtolerance(25°C)and3%overline,loadandtempera-ture.Features■FlexCap:Stablewithceramic,tantalum,oraluminumcapacitors■Stablewith10µFinput/outputcapacitor■Adjustableoutputvoltagefrom0.6Vto5V■Lowgroundpincurrent■25nAquiescentcurrentinshutdownmode■Guaranteedoutputcurrentof3A■AvailableinTO-263,TO-263THINpackages■GuaranteedVADJaccuracyof±1.5%@25°C(AGrade)■GuaranteedVADJaccuracyof±3.5%@25°C(STD)■Over-TemperatureandOver-Currentprotection■−40°Cto+125°CoperatingTJrange■Enablepin(LP38501)Applications■ASICPowerSuppliesIn:Printers,GraphicsCards,DVDPlayersSetTopBoxes,Copiers,Routers■DSPandFPGAPowerSupplies■SMPSRegulator■Conversionfrom3.3Vor5VRailTypicalApplicationCircuit30028119©2009NationalSemiconductorCorporation300281(TS)Package30028122TopView(LP38501TS-ADJ)TO-263Package30028121TopView(LP38503TS-ADJ)TO-263PackageConnectionDiagramsforTO-263THIN(TJ)Package30028162TopView(LP38501TJ-ADJ,LP38501ATJ-ADJ)TO-263THINPackage30028163TopView(LP38503TJ-ADJ,LP38503ATJ-ADJ)TO-263THINPackage(TS)andTO-263THIN(TJ)PackagesPin#DesignationFunction1ENEnable(LP38501only).Pullhightoenabletheoutput,lowtodisabletheoutput.Thispinhasnointernalbiasandmustbeeithertiedtotheinputvoltage,oractivelydriven.N/CIntheLP38503,thispinhasnointernalconnections.Itcanbeleftfloatingorusedfortracerouting.2INInputSupplyPin3GNDGround4OUTRegulatedOutputVoltagePin5ADJSetsoutputvoltageDAPDAPTheDAPisusedasathermalconnectiontoremoveheatfromthedevicetothecircuitboardcoppercladareawhichactsastheheatsink.TheDAPiselectricallyconnectedtothebacksideofthedie.TheDAPmustbeconnectedtogroundpotential,butcannotbeusedastheonlygroundconnection.OrderingInformationTABLE1.PackageMarkingandOrderingInformationOutputVoltageOrderNumberPackageTypePackageMarkingSuppliedAs:ADJLP38501TSX-ADJTO-263LP38501TS-ADJTapeandReelof500UnitsLP38501TS-ADJLP38501TS-ADJRailof45UnitsLP38503TSX-ADJLP38503TS-ADJTapeandReelof500UnitsLP38503TS-ADJLP38503TS-ADJRailof45UnitsADJLP38501TJ-ADJTO-263THINLP38501TJ-ADJTapeandReelof1000UnitsLP38503TJ-ADJLP38503TJ-ADJTapeandReelof1000UnitsLP38501ATJ-ADJLP38501ATJ-ADTapeandReelof1000UnitsLP38503ATJ-ADJLP38503ATJ-ADTapeandReelof1000Units3(Note1)IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheNationalSemiconductorSalesOffice/Distributorsforavailabilityandspecifications.StorageTemperatureRange−65°Cto+150°CLeadTemperature(Soldering,5sec.)260°CESDRating(Note2)±2kVPowerDissipation(Note3)InternallyLimitedInputPinVoltage(Survival)−0.3Vto+6.0VEnablePinVoltage(Survival)−0.3Vto+6.0VOutputPinVoltage(Survival)−0.3Vto+6.0VIOUT(Survival)InternallyLimitedOperatingRatings(Note1)InputSupplyVoltage2.7Vto5.5VEnableInputVoltage0.0Vto5.5VOutputCurrent(DC)0to3AJunctionTemperature(Note3)−40°Cto+125°CVOUT0.6Vto5VElectricalCharacteristicsLP38501/3–ADJUnlessotherwisespecified:VIN=3.3V,IOUT=10mA,CIN=10µF,COUT=10µF,VEN=VIN,VOUT=1.8V.LimitsinstandardtypeareforTJ=25°Conly;limitsinboldfacetypeapplyoverthejunctiontemperature(TJ)rangeof-40°Cto+125°C.MinimumandMaximumlimitsareguaranteedthroughtest,design,orstatisticalcorrelation.TypicalvaluesrepresentthemostlikelyparametricnormatTJ=25°C,andareprovidedforreferencepurposesonly.SymbolParameterConditionsMinTypMaxUnitsVADJAdjustPinVoltage(Note6)2.7V≤VIN≤5.5V10mA≤IOUT≤3A0.5840.5750.6050.6260.635VVADJAdjustPinVoltage(Note6)AGRADE2.7V≤VIN≤5.5V10mA≤IOUT≤3A0.5960.5870.6050.6140.623VIADJAdjustPinBiasCurrent2.7V≤VIN≤5.5V50750nAVDODropoutVoltage(Note7)IOUT=3A420550665mVΔVOUT/ΔVINOutputVoltageLineRegulation(Note4,Note6)2.7V≤VIN≤5.5V—0.040.05—%/VΔVOUT/ΔIOUTOutputVoltageLoadRegulation(Note5,Note6)10mA≤IOUT≤3A—0.120.24—%/AIGNDGroundPinCurrentInNormalOperationMode10mA≤IOUT≤3A—245mAIDISABLEDGroundPinCurrentVENVIL(EN)—0.0250.12515µAIOUT(PK)PeakOutputCurrentVOUT≥VOUT(NOM)-5%6AISCShortCircuitCurrentVOUT=0V3.56AEnableInput(LP38501Only)VIH(EN)EnableLogicHighVOUT=ON1.4——VVIL(EN)EnableLogicLowVOUT=OFF——0.65td(off)Turn-offdelayTimefromVENVIL(EN)toVOUT=OFFILOAD=3A—25—µstd(on)Turn-ondelayTimefromVENVIH(EN)toVOUT=ONILOAD=3A—25—IIH(EN)EnablePinH