TPS74401中文资料

TPS74401TPS74401(1ms/div)C=0FSSmC=0.001FSSmC=0.0047FSSmVOUTVEN0V1.1VTPS74401SBVS066D–DECEMBER2005–REVISEDAUGUST20063.0AUltra-LowDropoutLinearRegulator•Soft-Start(SS)PinProvidesaLinearStartupTheTPS74401low-dropout(LDO)linearregulatorwithRampTimeSetbyExternalCapacitorprovidesaneasy-to-userobustpowermanagement•1%AccuracyOverLine,Load,andsolutionforawidevarietyofapplications.TemperatureUser-programmablesoft-startminimizesstresson•SupportsInputVoltagesasLowas0.9VwiththeinputpowersourcebyreducingcapacitiveinrushExternalBiasSupplycurrentonstart-up.Thesoft-startismonotonicandwell-suitedforpoweringmanydifferenttypesof•AdjustableOutput(0.8Vto3.6V)processorsandASICs.Theenableinputand•Ultra-LowDropout:115mVat3.0A(typ)power-goodoutputalloweasysequencingwith•StablewithAnyorNoOutputCapacitorexternalregulators.Thiscompleteflexibilitypermitstheusertoconfigureasolutionthatwillmeetthe•ExcellentTransientResponsesequencingrequirementsofFPGAs,DSPs,and•Availablein5mm×5mm×1mmQFNandotherapplicationswithspecificstart-uprequirements.DDPAK-7PackagesAprecisionreferenceanderroramplifierdeliver1%•Open-DrainPower-Good(QFNonly)accuracyoverload,line,temperature,andprocess.•ActiveHighEnableEachLDOisstablewithlow-costceramicoutputcapacitorsandthedeviceisfullyspecifiedfrom–40°Cto+125°C.TheTPS74401isofferedina•FPGAApplicationssmall(5mm×5mm)QFNpackage,yieldingahighlycompacttotalsolutionsize.Forapplicationsthat•DSPCoreandI/OVoltagesrequireadditionalpowerdissipation,theDDPAK•Post-RegulationApplications(KTW)packageisalsoavailable.•ApplicationswithSpecialStart-UpTimeorSequencingRequirements•Hot-SwapandInrushControlsFigure1.TypicalApplicationCircuitFigure2.Turn-OnResponsePleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.Alltrademarksarethepropertyoftheirrespectiveowners.PRODUCTIONDATAinformationiscurrentasofpublicationdate.Copyright©2005–2006,TexasInstrumentsIncorporatedProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.Productionprocessingdoesnotnecessarilyincludetestingofallparameters.(1)DISSIPATIONRATINGSTPS74401SBVS066D–DECEMBER2005–REVISEDAUGUST2006ThisintegratedcircuitcanbedamagedbyESD.TexasInstrumentsrecommendsthatallintegratedcircuitsbehandledwithappropriateprecautions.Failuretoobserveproperhandlingandinstallationprocedurescancausedamage.ESDdamagecanrangefromsubtleperformancedegradationtocompletedevicefailure.Precisionintegratedcircuitsmaybemoresusceptibletodamagebecauseverysmallparametricchangescouldcausethedevicenottomeetitspublishedspecifications.ORDERINGINFORMATION(1)PRODUCTVOUT(2)TPS744xxyyyzXXisnominaloutputvoltage(forexample,12=1.2V,15=1.5V,01=Adjustable).(3)YYYispackagedesignator.Zispackagequantity.(1)ForthemostcurrentpackageandorderinginformationseethePackageOptionAddendumattheendofthisdocument,orseetheTIwebsiteat(2)Outputvoltagesfrom0.9Vto1.5Vin50mVincrementsand1.5Vto3.6Vin100mVincrementsareavailablethroughtheuseofinnovativefactoryEEPROMprogramming;minimumorderquantitiesmayapply.Contactfactoryfordetailsandavailability.(3)Forfixed0.8Voperation,tieFBtoOUT.AtTJ=–40°Cto+125°C,unlessotherwisenoted.AllvoltagesarewithrespecttoGND.TPS74401UNITVIN,VBIASinputvoltagerange–0.3to+6VVENenablevoltagerange–0.3to+6VVPGpower-goodvoltagerange–0.3to+6VVSSSSpinvoltagerange–0.3to+6VVFBfeedbackpinvoltagerange–0.3to+6VVOUToutputvoltagerange–0.3toVIN+0.3VIOUTmaximumoutputcurrentInternallylimitedOutputshortcircuitdurationIndefinitePDISScontinuoustotalpowerdissipationSeeDissipationRatingsTableTJoperatingjunctiontemperaturerange–40to+125°CTSTGstoragejunctiontemperaturerange–55to+150°C(1)StressesbeyondthoselistedunderAbsoluteMaximumRatingsmaycausepermanentdamagetothedevice.Thesearestressratingsonlyandfunctionaloperationofthedeviceattheseconditionsisnotimplied.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.TA+25°CDERATINGFACTORPACKAGEθJAθJCPOWERRATINGABOVETA=+25°CRGW(QFN)(1)36.5°C/W4.05°C/W2.74W27.4mW/°CKTW(DDPAK)(2)18.8°C/W2.32°C/W5.32W53.2mW/°C(1)SeeFigure32forPCBlayoutdescription.(2)SeeFigure35forPCBlayoutdescription.2SubmitDocumentationFeedback–DECEMBER2005–REVISEDAUGUST2006AtVEN=1.1V,VIN=VOUT+0.3V,CIN=CBIAS=0.1μF,COUT=10μF,IOUT=50mA,VBIAS=5.0V,andTJ=–40°Cto+125°C,unlessotherwisenoted.TypicalvaluesareatTJ=+25°C.TPS74401PARAMETERTESTCONDITIONSMINTYPMAXUNITVINInputvoltagerangeVOUT+VDO5.5VVBIASBiaspinvoltagerange2.3755.25VVREFInternalreference(Adj.)TJ=+25°C0.7960.80.804VOutputvoltagerangeVIN=5V,IOUT=1.5A,VBIAS=5VVREF3.6VVOUTAccuracy(1)2.97V≤VBIAS≤5.25V,50mA≤IOUT≤3.0A–1±0.2+1%VOUT(NOM)+0.3≤VIN≤5.5V,QFN0.00050.05VOUT/VINLineregulation%/VVOUT(NOM)+0.3≤VIN≤5.5V,DDPAK0.00050.060mA≤IOUT≤50mA0.013%/mAVOUT/IOUTLoadregulation50mA≤IOU