(SOIC)PACKAGE(TOPVIEW)LP2950...LP(TO-226/TO-92PACKAGE(BOTTOMVIEW)DESCRIPTION/ORDERINGINFORMATIONLP2950,,LP2951ADJUSTABLEMICROPOWERVOLTAGEREGULATORSWITHSHUTDOWNSLVS582D–APRIL2006–REVISEDMARCH2007•WideInputRange…upto30V•StableWithLowESR(12mΩ)Capacitors•RatedOutputCurrentof100mA•Current-andThermal-LimitingFeatures•LowDropout…380mV(Typ)at100mA•LP2950Only(3-PinPackage)•LowQuiescentCurrent…75μA(Typ)–Fixed-OutputVoltagesof5V,3.3V,and3V•TightLineRegulation…0.03%(Typ)•LP2951Only(8-PinPackage)•TightLoadRegulation…0.04%(Typ)–Fixed-orAdjustable-OutputVoltages:•HighVOAccuracy5V/ADJ,3.3V/ADJ,and3V/ADJ–1.4%at25°C–Low-VoltageErrorSignalonFallingOutput–2%OverTemperature–ShutdownCapability•CanBeUsedasaRegulatororReference–RemoteSenseCapabilityforOptimalOutputRegulationandAccuracyTheLP2950andLP2951devicesarebipolar,low-dropoutvoltageregulatorsthatcanaccommodateawideinputsupply-voltagerangeofupto30V.Theeasy-to-use,3-pinLP2950isavailableinfixed-outputvoltagesof5V,3.3V,and3V.However,the8-pinLP2951isabletooutputeitherafixedoradjustableoutputfromthesamedevice.BytyingtheOUTPUTandSENSEpinstogether,andtheFEEDBACKandVTAPpinstogether,theLP2951outputsafixed5V,3.3V,or3V(dependingontheversion).Alternatively,byleavingtheSENSEandVTAPpinsopenandconnectingFEEDBACKtoanexternalresistordivider,theoutputcanbesettoanyvaluebetween1.235Vto30V.The8-pinLP2951alsooffersadditionalfunctionalitythatmakesitparticularlysuitableforbattery-poweredapplications.Forexample,alogic-compatibleshutdownfeatureallowstheregulatortobeputinstandbymodeforpowersavings.Inaddition,thereisabuilt-insupervisorresetfunctioninwhichtheERRORoutputgoeslowwhenVOUTdropsby6%ofitsnominalvalueforwhateverreasons–duetoadropinVIN,currentlimiting,orthermalshutdown.TheLP2950andLP2951aredesignedtominimizeallerrorcontributionstotheoutputvoltage.Withatightoutputtolerance(0.5%at25°C),averylowoutputvoltagetemperaturecoefficient(20ppmtypical),extremelygoodlineandloadregulation(0.3%and0.4%typical),andremotesensingcapability,thepartscanbeusedaseitherlow-powervoltagereferencesor100-mAregulators.Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.PRODUCTIONDATAinformationiscurrentasofpublicationdate.Copyright©2006–2007,TexasInstrumentsIncorporatedProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.Productionprocessingdoesnotnecessarilyincludetestingofallparameters.–APRIL2006–REVISEDMARCH2007ORDERINGINFORMATION(1)VOUTORDERABLETAPACKAGE(2)TOP-SIDEMARKING(NOM)PARTNUMBERBulkof1000LP2950-30LPTO-226/TO-92–LPKY5030Reelof2000LP2950-30LPR3VTubeof75LP2951-30DSOIC–DKY5130Reelof2500LP2951-30DRBulkof1000LP2950-33LPTO-226/TO-92–LPKY5033Reelof2000LP2950-33LPR3.3VTubeof75LP2951-33D–40°Cto125°CSOIC–DKY5133Reelof2500LP2951-33DRBulkof1000LP2950-50LPPREVIEWTO-226/TO-92–LPReelof2000LP2950-50LPRKY50505VTubeof75LP2951-50DSOIC–DKY5150Reelof2500LP2951-50DRTubeof75LP2951DADJSOIC-DKY5150Reelof2500LP2951DR(1)Forthemostcurrentpackageandorderinginformation,seethePackageOptionAddendumattheendofthisdocument,orseetheTIwebsiteat(2)Packagedrawings,standardpackingquantities,thermaldata,symbolization,andPCBdesignguidelinesareavailableat100mAERRORAmplifier−+1.23-VReferenceINPUTOUTPUTGND++UnregulatedDC+SeeApplicationInformationToCMOSorTTLVOUTIL100mAERRORAmplifier−+1.235-VReferenceINPUTSENSEGND+++UnregulatedDCFEEDBACK−+VTAPERRORSHUTDOWN+330kERRORDetectionComparator4562OUTPUT1873FromCMOSorTTL60mVSeeApplicationInformationSeeApplicationInformationLP2950,,LP2951ADJUSTABLEMICROPOWERVOLTAGEREGULATORSWITHSHUTDOWNSLVS582D–APRIL2006–REVISEDMARCH2007LP2950FUNCTIONALBLOCKDIAGRAMLP2951FUNCTIONALBLOCKDIAGRAM3SubmitDocumentationFeedback(1)RecommendedOperatingConditionsLP2950,,LP2951ADJUSTABLEMICROPOWERVOLTAGEREGULATORSWITHSHUTDOWNSLVS582D–APRIL2006–REVISEDMARCH2007overoperatingfree-airtemperaturerange(unlessotherwisenoted)MINMAXUNITVINContinuousinputvoltagerange–0.330VVSHDNSHUTDOWNinputvoltagerange–1.530VERRORcomparatoroutputvoltagerange(2)–1.530VVFDBKFEEDBACKinputvoltagerange(2)(3)–1.530VDpackage97θJAPackagethermalimpedance(4)(5)°C/WLPpackage140TJOperatingvirtualjunctiontemperature150°CTstgStoragetemperaturerange–65150°C(1)Stressesbeyondthoselistedunderabsolutemaximumratingsmaycausepermanentdamagetothedevice.Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderrecommendedoperatingconditionsisnotimplied.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.(2)Mayexceedinputsupplyvoltage(3)Ifloadisreturnedtoanegativepowersupply,theoutputmustbediodeclampedtoGND.(4)MaximumpowerdissipationisafunctionofTJ(max),θJA,andTA.Th