TPS54331中文资料

1FEATURESDESCRIPTIONAPPLICATIONS01020304050607080901000.010.1110Efficiency-%I-LoadCurrent-ALV=5VIV=12VIV=18VIV=24VIV=28VIPHVINGNDBOOTVSENSECOMPSSCSSD1VINVOUTENTPS54331CICBOOTLOCORen1RO2C1C2R3Ren2RO1TPS54331–JULY20083A,28VINPUT,STEPDOWNSWIFT™DC/DCCONVERTERWITHEco-mode™2•3.5Vto28VInputVoltageRange•AdjustableOutputVoltageDownto0.8VTheTPS54331isa28-V,3-Anon-synchronousbuckconverterthatintegratesalowRds(on)highside•Integrated80mΩHighSideMOSFETSupportsMOSFET.Toincreaseefficiencyatlightloads,aupto3AContinuousOutputCurrentpulseskippingEco-mode™featureisautomatically•HighEfficiencyatLightLoadswithaPulseactivated.Furthermore,the1μAshutdownsupplySkippingEco-mode™currentallowsthedevicetobeusedinbatterypoweredapplications.Currentmodecontrolwith•Fixed570kHzSwitchingFrequencyinternalslopecompensationsimplifiestheexternal•Typical1μAShutdownQuiescentCurrentcompensationcalculationsandreducescomponent•AdjustableSlowStartLimitsInrushCurrentscountwhileallowingtheuseofceramicoutputcapacitors.Aresistordividerprogramsthehysterisis•ProgrammableUVLOThresholdoftheinputunder-voltagelockout.Anovervoltage•OvervoltageTransientProtectiontransientprotectioncircuitlimitsvoltageovershoots•CyclebyCycleCurrentLimit,FrequencyFoldduringstartupandtransientconditions.AcyclebyBackandThermalShutdownProtectioncyclecurrentlimitscheme,frequencyfoldbackandthermalshutdownprotectthedeviceandtheloadin•AvailableinEasy-to-UseSOIC8Packagetheeventofanoverloadcondition.TheTPS54331is•SupportedbySwitcherPro™SoftwareToolavailableinan8-pinSOICpackagethathasbeen()•ForSWIFT™Documentation,SeetheTIWebsiteat•ConsumerApplicationssuchasSet-TopBoxes,CPEEquipment,LCDDisplays,Peripherals,andBatteryChargers•IndustrialandCarAudioPowerSupplies•5V,12Vand24VDistributedPowerSystemsSIMPLIFIEDSCHEMATICEFFICIENCY1Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.2SWIFT,Eco-mode,SwitcherProaretrademarksofTexasInstruments.PRODUCTIONDATAinformationiscurrentasofpublicationdate.Copyright©2008,TexasInstrumentsIncorporatedProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.Productionprocessingdoesnotnecessarilyincludetestingofallparameters.ABSOLUTEMAXIMUMRATINGS(1)PACKAGEDISSIPATIONRATINGS(1)(2)(3)TPS54331SLVS839–JULY2008.......................................................................................................................................................................................................(1)TJPACKAGESWITCHINGFREQUENCYPARTNUMBER(2)–40°Cto150°C8pinSOIC570kHzTPS54331D(1)Forthemostcurrentpackageandorderinginformation,seethePackageOptionAddendumattheendofthisdocument,orseetheTIwebsiteat(2)TheDpackageisalsoavailabletapedandreeled.AddanRsuffixtothedevicetype(i.e.,TPS54331DR).Seeapplicationssectionofdatasheetforlayoutinformation.overoperatingfree-airtemperaturerange(unlessotherwisenoted)VALUEUNITVIN–0.3to30EN–0.3to5BOOT38InputVoltageVVSENSE–0.3to3COMP–0.3to3SS–0.3to3BOOT-PH8OutputVoltagePH–0.6to30VPH(10nstransientfromgroundtonegtivepeak)–5EN100μABOOT100mASourceCurrentVSENSE10μAPH9AVIN9ASinkCurrentCOMP100μASS200ElectrostaticDischarge(HBM)2kVElectrostaticDischarge(CDM)500VOperatingJunctionTemperature–40to150°CStorageTemperature–65to150°C(1)Stressesbeyondthoselistedunderabsolutemaximumratingsmaycausepermanentdamagetothedevice.Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderrecommendedoperatingconditionsisnotimplied.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliabiltiy.PACKAGETHERMALIMPEDANCEJUNCTIONTOPSEUDOTHERMALIMPEDANCEJUNCTIONTOAMBIENTTOPSOIC8100°C/W5°C/W(1)Maximumpowerdissipationmaybelimitedbyovercurrentprotection(2)PowerratingataspecificambienttemperatureTAshouldbedeterminedwithajunctiontemperatureof150°C.Thisisthepointwheredistortionstartstosubstantiallyincrease.ThermalmanagementofthePCBshouldstrivetokeepthejunctiontemperatureatorbelow150°Cforbestperformanceandlong-termreliability.Seepowerdissipationestimateinapplicationsectionofthisdatasheetformoreinformation.(3)Testboardconditions:a.2inchesx1.5inches,2layers,thickness:0.062inchb.2-ouncecoppertraceslocatedonthetopandbottomofthePCBc.6thermalviaslocatedunderthedevicepackage2SubmitDocumentationFeedbackCopyright©2008,TexasInstrumentsIncorporatedProductFolderLink(s):TPS54331RECOMMENDEDOPERATINGCONDITIONSELECTRICAL