am57xlinux-rt光盤-底板芯片tps2065cdbvt

限流配電開特 說

TPS20xxC,TPS20xxC-ZHCS443G–JUNE2011–REVISEDJULY 與現(xiàn)有的德州儀器(TI)系列產(chǎn)品

0.5A2A之間的應(yīng)用提供具有 已選擇具有(TPS20xxC)和沒有(TPS20xxC-2)輸

DGN,

1212354

ENor

DGN

ENor010110FaultSignalControlSignal

150F*DGNENor ENor 1.器件器狀MSOP-8PowerPad封5MSOP-—激活和激—1激活和激激活和激—1TPS2065C-激激—激活和激—TPS2069C-激——2激活和激—激活和激(1)要獲得細(xì)節(jié)，請(qǐng)見此器件信息表Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddierstheretoappearsattheendofthisdatasheet.?2011–2013,TexasInstrumentsPowerPadisatrademark?2011–2013,TexasInstrumentsPRODUCTIONDATAinformationiscurrentasofpublicationdate.ProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.Productionprocessingdoes EnglishDataSheet:necessarilyincludetestingofallThisintegratedcircuitcanbedamagedbyESD.TexasInstruments mendsthatallintegratedcircuitsbehandledwithappropriateprecautions.Failuretoobserveproperhandlingandinstallationprocedurescancausedamage.ESDdamagecanrangefromsubtleperformancedegradationtocompletedevicefailure.Precisionintegratedcircuitsmaybemoresusceptibletodamagebecauseverysmallparametricchangescouldcausethedevicenottomeetitspublishedspecifications.PACKAGEDDEVICEANDMSOP-8Y––Y––1Y–1Y–1NTPS2065C-–Y––Y–NTPS2069C-––2Y–2Y–Forthemostcurrentpackagingandorderinginformation,seethePackageOptionAddendumattheendofthis,orseetheTIwebsiteat"-"indicatesthedeviceisnotavailableinthis UMVoltagerangeonIN,OUT,ENorEN,FLT6VVoltagerangefromINto6Vumjunctiontemperature,InternallyElectrostatic2VIEC61000-4-2,Contact/Air8Absoluteumratingsapply mendedjunctiontemperatureVoltagesarewithrespecttoGNDunlessotherwiseSeetheInputandOutputCapacitanceVOUTwassurgedonapcbwithinputandoutputbypassingper1exceptinputcapacitorwas22μF)withnodeviceTHERMAL(SeeDEVICEINFORMATION0.5Aor11.5Aor20.5Aor11.5Aor2255888Junction-to-ambientthermalJunction-to-case(top)thermalJunction-to-boardthermalJunction-to-boardcharacterizationθJACustomSeethePowerDIssipationandTemperatureFormoreinformationabouttraditionalandnewthermalmetrics,seetheICPackageThermalMetricsapplicationreport,MENDEDOPERATINGInputvoltage,VInputvoltage,ENor0VHigh-levelinputvoltage,ENor2VLow-levelinputvoltage,ENorVTPS2041CandATPS2061C,TPS2065CandTPS2065C-1TPS2068C,TPS2069CandTPS2069C-TPS2000Cand2OperatingjunctionSinkcurrentinto05SomepackageandcurrentratingmayrequestanambienttemperaturederatingofELECTRICALCHARACTERISTICS:TJ=TA=Unlessotherwisenoted:,VN=5V,VEN=VINorVEN=GND,IOUT=0A.Seethe'DeviceInformation'tablefortheratedcurrentofeachpartnumber.Parametricsoverawideroperationalrangeareshowninthesecond'ElectricalCharacteristics'TESTPOWERInput–output0.5Aratedoutput,0.5Arated–40°C≤(TJ,TA)≤1Aratedoutput,1Arated–40°C≤(TJ,TA)≤1.5Aratedoutput,1.5Arated–40°C≤(TJ,TA)≤2Aratedoutput,DGN,2Aratedoutput,–40°C≤(TJ,TA)≤DGN,CURRENT0.5AratedA1AratedTPS20xxC-IOSCurrent-SeeFigure1.5AratedTPS20xxC-2AratedSUPPLYSupplycurrent,switchIOUT=0 –40°C≤(TJ,TA)≤85°C,VIN=5.5V,IOUT=02Supplycurrent,switchIOUT=0–40°C≤(TJ,TA)≤85°C,VIN=5.5V,IOUT=0LeakageVOUT=0V,VIN=5V,disabled,measureIVINTPS20xxC- –40°C≤(TJ,TA)≤85°C,VOUT=0VIN=5V,disabled,measure2PulsedtestingtechniquesmaintainjunctiontemperatureapproximayequaltoambientSeeCURRENTLIMITsectionforexplanationofthisELECTRICALCHARACTERISTICS:TJ=TA=25°C(1)Unlessotherwisenoted:,VN=5V,VEN=VINorVEN=GND,IOUT=0A.Seethe'DeviceInformation'tablefortheratedcurrentofeachpartnumber.Parametricsoverawideroperationalrangeareshowninthesecond'ElectricalCharacteristics'TESTReverseleakageVOUT=5V,VIN=0V,measure –40°C≤(TJ,TA)≤85°C,VOUT=5V,VIN=0V,measure5OUTPUTOutputpull-VIN=VOUT=5V,?Theseparametersareprovidedforreferenceonly,anddonotconstitutepartofTI'spublisheddevicespecificationsforpurposesofTI'sproductwarranty.ELECTRICALCHARACTERISTICS:–40°C≤TJ≤Unlessotherwisenoted:4.5V≤VIN≤5.5V,VEN=VNorVEN=GND,IOUT=0A,typicalvaluesareat5Vand25°C.SeetheDEVICEINFORMATIONtablefortheratedcurrentofeachpartnumber.TESTPOWERInput–output0.5Arated1Arated1.5Arated2AratedDGN,ENABLEINPUT(ENorInput12VVLeakage(VENorVEN)=0Vor5.501TurnonVIN=5V,CL=1μF,RL=100Ω,EN↑orENSeeFigure2,Figure4,andFigure0.5A/1A11.5A/2ATurnoffVIN=5V,CL=1μF,RL=100Ω,EN↓orENSeeFigure2,Figure4,andFigure0.5Aand1A21.5A/2ARisetime,CL=1μF,RL=100Ω,VIN=5V.SeeFigure0.5A/1A1.5A/2AFalltime,CL=1μF,RL=100Ω,VIN=5V.SeeFigure0.5A/1A1.5A/2ACURRENT0.5AratedA1AratedTPS20xxC-IOSCurrent-SeeFigure1.5AratedTPS20xxC-2AratedPulsedtestingtechniquesmaintainjunctiontemperatureapproximayequaltoambientSeeCURRENTLIMITsectionforexplanationofthisELECTRICALCHARACTERISTICS:–40°C≤TJ≤125°CUnlessotherwisenoted:4.5V≤VIN≤5.5V,VEN=VNorVEN=GND,IOUT=0A,typicalvaluesareat5Vand25°C.SeetheDEVICEINFORMATIONtablefortheratedcurrentofeachpartnumber.TESTShort-circuitresponseVIN=5V(seeFigureOne-halffullload→RSHORT=50Measurefromapplicationtowhencurrentfallsbelow120%offinalvalue2SUPPLYSupplycurrent,switchIOUT=0 Supplycurrent,switchIOUT=0LeakageVOUT=0V,VIN=5V,disabled,measureIVINTPS20XXC-ReverseleakageVOUT=5.5V,VIN=0V,measureUNDERVOLTAGERising4VVOutputlowvoltage,IFLT=1VOff-stateVFLT=5.51FLTFLTassertionordeassertion69OUTPUTOutputpull-downVIN=4V,VOUT=5V,?VIN=5V,VOUT=5V,RisingthresholdIncurrentNotincurrentHysteresisTheseparametersareprovidedforreferenceonly,anddonotconstitutepartofTI'spublisheddevicespecificationsforpurposesofTI'sproductwarranty.Theseparametersareprovidedforreferenceonly,anddonotconstitutepartofTI'spublisheddevicespecificationsforpurposesofTI'sproductwarranty.

Figure2.OutputRise/FallTest Figure3.Power-OnandOffFigure4.EnableTiming,ActiveHigh Figure5.EnableTiming,ActiveLow120%120%xFigure6.OutputShortCircuit

Slope=

00

Figure7.OutputCharacteristicShowingCurrentFUNCTIONALBLOCK

Figure8.TPS20xxCBlock

Figure9.TPS20xxC-2BlockDEVICEPIN8-PINENor4Enableinput,logichighturnsonpower1Ground2,Inputvoltageandpower-switchdrain;connecta0.1μForgreaterceramiccapacitorfromINtoGNDclosetotheIC5Active-lowopen-drainoutput,assertedduringover-current,orover-temperature6,7,Power-switchoutput,connecttoInternallyconnectedtoGND.ConnectPADtoGNDplaneasaheatsinkforthebestthermalperformance.PADmaybeleftfloatingifdesired.SeePOWERDISSIPATIONANDJUNCTIONTEMPERATUREsectionforguidance.5-PINENor4Enableinput,logichighturnsonpower2Ground5Inputvoltageandpower-switchdrain;connecta0.1μForgreaterceramiccapacitorfromINtoGNDclosetotheIC3Active-lowopen-drainoutput,assertedduringover-current,orover-temperature1Power-switchoutput,connectto

TYPICAL

EN

2

FaultNoteverypackagehasallThesepartsarefortestHelpswithoutputshortingtestswhenexternalsupplyisFigure10.TestCircuitforSystemOperationinTypicalCharacteristicsVINVIN=5V,COUT=150μF,RLOAD=5,OutputOutput87AmplitudeAmplitude543210?2m 2m4m6m8m10m12m14m16m18m

VIN=VIN=5V,COUT=150μF,RLOAD=100,OutputOutput AmplitudeAmplitudeCurrentCurrent ?2m 2m4m6m8m10m12m14m16m18m

CurrentCurrentTime TimeFigure11.TPS2065COutputRise/Fall Figure12.TPS2065COutputRise/FallVIN=VIN=5V,COUT=150μF,RLOAD=0,OutputOutput

VIN=5V,COUT=150μF,RLOAD=50m,

AmplitudeAmplitude

AmplitudeAmplitudeCurrentCurrent43210 Output

Output

CurrentCurrent?2m0 2m4m6m8m10m12m14m16m18mTime(s)

TimeFigure13.TPS2065CEnableintoOutput Figure14.TPS2065CPulsedShortVIN=VIN=5V,COUT=0μF,OutputOutput VoltageVoltage TimeFigure15.TPS2065CShort

VINVIN=5V,COUT=0μF,RLOAD=50m,OutputVoltageOutputVoltageCurrentCurrent TimeFigure16.TPS2065CPulsed1.45-A

OutputOutputCurrentVIN=5V,COUTVIN=5V,COUT=0μF,RLOAD=50m,TPS2065C8 7OutputVoltageOutputCurrentOutputVoltageOutputCurrentAmplitude 4 1 0

VINVIN=5V,COUT=150μF,RLOAD=7.5,OutputCurrentCurrent Time

?5m?4m?3m?2m?1m 1m2m3m4mTimeFigure17.TPS2065C50mΩShort Figure18.TPS2065CPowerUp-9 VIN=5V,COUT=150μF,RLOAD=7.5,7AmplitudeAmplitude EN,3 Output10 Output

AmplitudeAmplitudeCurrentCurrent

VINVIN=5V,COUT=150μF,RLOAD=2.5,OutputOutputCurrentCurrent?40m?30m?20m 10m20m30mTime

?2m0 2m4m6m8m10m12m14m16m18mTime(s)Figure19.TPS2065CPowerDown- Figure20.TPS2001CTurnONintoVIN=5VIN=5V,COUT=150μF,RLOAD=50m, AmplitudeAmplitudeAmplitudeAmplitudeCurrent Current

VINVIN=5V,COUT=150μF,RLOAD=50m,OutputCurrentCurrent?2m0 2m4m6m8m10m12m14m16m18mTime(s)

?2.5m02.5m5m7.5m10m12.5m15m17.5m20m22TimeFigure21.TPS2001CEnableinto Figure22.TPS2001CPulsedOutputVINVIN=5V,COUT=150μF,RLOAD=10,OutputOutput87AmplitudeAmplitude543210?2m 2m4m6m8m10m12m14m16m

VIN=VIN=5V,COUT=150μF,RLOAD=50m,OutputOutput AmplitudeAmplitudeCurrentCurrent ?2m 2m4m6m8m10m12m14m16m

CurrentCurrentTime TimeFigure23.TPS2051CTurnONinto Figure24.TPS2051CEnableintoVIN=5VIN=5V,COUT=150μF,RLOAD=50m,Output AmplitudeAmplitudeAmplitudeAmplitudeCurrent Current 0

VINVIN=5V,COUT=150μF,RLOAD=3.3,OutputCurrentCurrent?2.5m02.5m5m7.5m10m12.5m15m17.5m20m22Time

?4m?2m0 2m4m6m8m10m12m14m16mTime(s)Figure25.TPS2051CPulsedOutput Figure26.TPS2069CTurnONintoVIN=5V,COUT=150μF,RLOAD=50m,8

VIN=5V,COUT=150μF,RLOAD=50m,

AmplitudeCurrentAmplitudeCurrentAmplitudeCurrentAmplitudeCurrent20

Output

Output

Output

?2m0 2m4m6m8m10m12m14m16m18mTime(s)

12TimeFigure27.TPS2069CEnableinto Figure28.TPS2069CPulsedOutputAllVersions,5AllVersions,5VIN=5IOUTIOUTsinkingtFLTtFLT 42?40 100120

00.00.51.01.52.02.53.03.54.04.55.0JuncionTemperature OutputFigure29.DeglitchPeriod(tFLT)vs Figure30.OutputDischargeCurrentvsOutput1.5-A1.5-A1-A0.5-AVIN=52-AIOSIOS?40 100120

AllAllUnitTypes,55IREVIREV3210?40 100120JuncionTemperature JuncionTemperature Figure31.ShortCircuitCurrent(IOS)vs Figure32.ReverseLeakageCurrent(IREV)vs

AllUnitISDISDInputVoltageInputVoltage=5.5

ISDISD

?40°Cand?40 100120 JuncionTemperature InputVoltage Figure33.DisabledSupplyCurrent(ISD)vs Figure34.DisabledSupplyCurrent(ISD)vsInputAllAllunittypes,VIN=0 IREVIREV

AllAllUnitTypes,VIN=5.5ISEISE?40 100120OutputVoltage JuncionTemperatureFigure35.ReverseLeakageCurrent(IREV)vsOutput Figure36.EnabledSupplyCurrent(ISE)vsTemperatureISEISE

COUTCOUT=1μF,RLOAD=1001.5-Aand2-ARated,VIN=4.51.5-Aand2-ARated,VIN=5V1.5-Aand2-ARated,VIN=5.50.5-Aand1-ARated,VIN=5tftf?40 100120InputVoltage JuncionTemperature Figure37.EnabledSupplyCurrent(ISE)vsInput Figure38.OutputFallTime(tF)vstrtrCOUTCOUT=1μF,RLOAD=1001.5A,2A,5.50.5A,1A,5V 1.5A,2A,5V1.5A,2A,4.5

VINVIN=50.5-A,1-A1.5-A,2-ARDSONRDSON?40 100120 ?40 100120JuncionTemperature

JuncionTemperature

Figure39.OutputRiseTime(tR)vs Figure40.Input-Output(RDS(ON))VINVIN=5V,CIN=730μF,TPS2065C,IEND=1.68RecoveryRecoveryTime1 IPK(Shorted)Figure41.RecoveryvsCurrent

DETAILEDTheTPS20xxCandTPS20xxC-2arecurrent-limited,power-distributionswitchesprovidingbetween0.5Aand2Aofcontinuousloadcurrentin5Vcircuits.ThesepartsuseN-channelMOSFETsforlow,maintainingvoltageregulationtotheload.Theyaredesignedforapplicationswhereshortcircuitsorheavycapacitiveloadswillbeencountered.Devicefeaturesincludeenable,reverseblockingwhendisabled,outputdischargepulldown,overcurrentprotection,over-temperatureprotection,anddeglitchedfaultreporting.Theundervoltagelockout(UVLO)circuitdisablesthepowerswitchuntiltheinputvoltagereachestheUVLOturn-onthreshold.Built-inhysteresispreventsunwantedon/offcyclingduetoinputvoltagedropfromlargecurrentsurges.FLTishighimpedancewhentheTPS20xxCandTPS20xxC-2areinUVLO.Thelogicenableinput(EN,orEN),controlsthepowerswitch,biasforthechargepump,driver,andothercircuits.Thesupplycurrentisreducedtolessthan1μAwhentheTPS20xxCandTPS20xxC-2aredisabled.DisablingtheTPS20xxCandTPS20xxC-2willimmediayclearanactiveFLTindication.TheenableinputiscompatiblewithbothTTLandCMOSlogiclevels.Theturnonandturnofftimes(tON,tOFF)arecomposedofadelayandariseorfalltime(tR,tF).Thedelaytimesareinternallycontrolled.TherisetimeiscontrolledbyboththeTPS20xxCandTPS20xxC-2andtheexternalloading(especiallycapacitance).TPS20xxCfalltimeiscontrolledbytheloading(RandC),andtheoutputdischarge(RPD).TPS20xxC-2doesnothavetheoutputdischarge(RPD),falltimeiscontrolledbytheloading(RandC).AnoutputloadconsistingofonlyaresistorwillexperienceafalltimesetbytheTPS20xxCandTPS20xxC-2.AnoutputloadwithparallelRandCelementswillexperienceafalltimedeterminedbythe(R×C)timeconstantifitislongerthantheTPS20xxCandTPS20xxC-2’stF.Theenableshouldnotbeleftopen,andmaybetiedtoVINorGNDdependingontheINTERNALCHARGEThedeviceincorporatesaninternalchargepumpandgatedrivecircuitrynecessarytodrivetheN-channelMOSFET.ThechargepumpspowertothegatedrivercircuitandprovidesthenecessaryvoltagetopullthegateoftheMOSFETabovethesource.Thedriverincorporatescircuitrythatcontrolstheriseandfalltimesoftheoutputvoltagetolimitlargecurrentandvoltagesurgesontheinputsupply,andprovidesbuilt-insoft-startfunctionality.TheMOSFETpowerswitchwillblockcurrentfromOUTtoINwhenturnedoffbytheUVLOorCURRENTTheTPS20xxCandTPS20xxC-2respondstooverloadsbylimitingoutputcurrenttothestaticIOSlevelsshownintheElectricalCharacteristicstable.Whenanoverloadconditionispresent,thedevicemaintainsaconstantoutputcurrent,withtheoutputvoltagedeterminedby(IOS×RLOAD).Twopossibleoverloadconditionscanoccur.Thefirstoverloadconditionoccurswheneither:1)inputvoltageisfirstapplied,enableistrue,andashortcircuitispresent(loadwhichdrawsIOUT>IOS),or2)inputvoltageispresentandtheTPS20xxCandTPS20xxC-2areenabledintoashortcircuit.TheoutputvoltageisheldnearzeropotentialwithrespecttogroundandtheTPS20xxCandTPS20xxC-2rampstheoutputcurrenttoIOS.TheTPS20xxCandTPS20xxC-2willlimitthecurrenttoIOSuntiltheoverloadconditionisremovedorthedevicebeginstothermalcycle.ThisisdemonstratedinFigure13wherethedevicewasenabledintoashort,andsubsequentlycyclescurrentoffandonasthethermalprotectionengages.Thesecondconditioniswhenanoverloadoccurswhilethedeviceisenabledandfullyturnedon.ThedevicerespondstotheoverloadconditionwithintIOS(Figure6andFigure7)whenthespecifiedoverload(perElectricalCharacteristicstable)isapplied.Theresponsespeedandshapewillvarywiththeoverloadlevel,inputcircuit,andrateofapplication.Thecurrent-limitresponsewillvarybetweensimplysettlingtoIOS,orturnoffandcontrolledreturntoIOS.Similartothepreviouscase,theTPS20xxCandTPS20xxC-2willlimitthecurrenttoIOSuntiltheoverloadconditionisremovedorthedevicebeginstothermalcycle.ThisisdemonstratedbyFigure14,Figure15,andFigure16.TheTPS20xxCandTPS20xxC-2thermalcyclesifanoverloadconditionispresentlongenoughtoactivatethermallimitinginanyoftheabovecases.Thisisduetotherelativelylargepowerdissipation[(VIN–VOUT)xIOS]drivingthejunctiontemperatureup.Thedeviceturnsoffwhenthejunctiontemperatureexceeds135°C(min)whileincurrentlimit.Thedeviceremainsoffuntilthejunctiontemperaturecools20°Candthenrestarts.TherearetwokindsofcurrentlimitprofilestypicallyavailableinTIswitchproductssimilartotheTPS20xxCandTPS20xxC-2.ManyolderdesignshaveanoutputIvsVcharacteristicsimilartotheplotlabeled"CurrentLimitwithPeaking"inFigure42.Thistypeoflimitingcanbecharacterizedbytwoparameters,thecurrentlimitcorner(IOC),andtheshortcircuitcurrent(IOS).IOCisoftenspecifiedasaumvalue.TheTPS20xxCandTPS20xxC-2familyofpartsdoesnotpresentnoticeablepeakinginthecurrentlimit,correspondingtothecharacteristiclabeled"FlatCurrentLimit"inFigure42.ThisiswhytheIOCparameterisnotpresentintheElectricalCharacteristicstables.

withSlope=-

Slope=-

00 IOS

00

Figure42.CurrentLimitTheFLTopen-drainoutputisasserted(activelow)duringanoverloadorover-temperaturecondition.A9msdeglitchonboththerisingandfallingedgesavoidsfalsereportingatstartupandduringtransients.Acurrentlimitconditionshorterthanthedeglitchperiodwillcleartheinternaltimerupontermination.Thedeglitchtimerwillnotintegratemultipleshortoverloadsanddeclareafault.Thisisalsotrueforexitingfromafaultedstate.AninputvoltagewithexcessiverippleandlargeoutputcapacitancemayinterferewithoperationofFLTaroundIOSastheripplewilldrivetheTPS20xxCandTPS20xxC-2inandoutofcurrentlimit.IftheTPS20xxCandTPS20xxC-2areincurrentlimitandtheover-temperaturecircuitgoesactive,FLTwillgotrueimmediay(seeFigure14)howeverexitingthisconditionisdeglitched(seeFigure16).FLTistrippedjustasthekneeoftheconstant-currentlimitingisentered.DisablingtheTPS20xxCandTPS20xxC-2willclearanactiveFLTassoonastheswitchturnsoff(seeFigure13).FLTishighimpedancewhentheTPS20xxCandTPS20xxC-2aredisabledorinunder-voltagelockout(UVLO).OUTPUTA470?(typical)outputdischargewilldissipatestoredchargeandleakagecurrentonOUTwhentheTPS20xxCisinUVLOordisabled.Thepull-downcircuitwilllosebiasgraduallyasVINdecreases,causingariseinthe asVINfallstowards0V.TheTPS20xxC-2doesnothavethisfunction.TheoutputisbecontrolledbyanexternalloadingswhenthedeviceisinULVOordisabled.INPUTANDOUTPUTInputandoutputcapacitanceimprovestheperformanceofthedevice;theactualcapacitanceshouldbeoptimizedfortheparticularapplication.Forallapplications,a0.1μForgreaterceramicbypasscapacitorbetweenINandGNDis mendedasclosetothedeviceaspossibleforlocalnoisedecoupling.AllprotectioncircuitssuchastheTPS20xxCandTPS20xxC-2willhavethepotentialforinputvoltageovershootsandoutputvoltageundershoots.Inputvoltageovershootscanbecausedbyeitheroftwoeffects.ThefirstcauseisanabruptapplicationofinputvoltageinconjunctionwithinputpowerbusinductanceandinputcapacitancewhentheINterminalishighimpedance(beforeturnon).Theoretically,thepeakvoltageis2timestheapplied.ThesecondcauseisduetotheabruptreductionofoutputshortcircuitcurrentwhentheTPS20xxCandTPS20xxC-2turnsoffandenergystoredintheinputinductancedrivestheinputvoltagehigh.InputvoltagedroopsmayalsooccurwithlargeloadstepsandastheTPS20xxCandTPS20xxC-2outputisshorted.Applicationswithlargeinputinductance(e.g.connectingtheevaluationboardtothebenchpower-supplythroughlongcables)mayrequirelargeinputcapacitancereducethevoltageovershootfromexceedingtheabsoluteumvoltageofthedevice.Thefastcurrent-limitspeedoftheTPS20xxCandTPS20xxC-2tohardoutputshortcircuitsisolatestheinputbusfromfaults.However,ceramicinputcapacitanceintherangeof1μFto22μFadjacenttotheTPS20xxCandTPS20xxC-2inputaidsinbothspeedingtheresponsetimeandlimitingthetransientseenontheinputpowerbus.Momentaryinputtransientsto6.5Varepermitted.OutputvoltageundershootiscausedbytheinductanceoftheoutputpowerbusjustafterashorthasoccurredandtheTPS20xxCandTPS20xxC-2hasabruptlyreducedOUTcurrent.EnergystoredintheinductancewilldrivetheOUTvoltagedownandpotentiallynegativeasitdischarges.Applicationswithlargeoutputinductance(suchasfromacable)benefitfromuseofahigh-valueoutputcapacitortocontrolthevoltageundershoot.WhenimplementingUSBstandardapplications,a120μFminimumoutputcapacitanceisrequired.Typicallya150μFelectrolyticcapacitorisused,whichissufficienttocontrolvoltageundershoots.However,iftheapplicationdoesnotrequire120μFofcapacitance,andthereispotentialtodrivetheoutputnegative,aminimumof10μFceramiccapacitanceontheoutputis mended.Thevoltageundershootshouldbecontrolledtolessthan1.5Vfor10POWERDISSIPATIONANDJUNCTIONItisgooddesignpracticetoestimatepowerdissipationand umexpectedjunctiontemperatureoftheTPS20xxCandTPS20xxC-2.Thesystemdesignercancontrolchoicesofpackage,proximitytootherpowerdissipatingdevices,andprintedcircuitboard(PCB)designbasedonthesecalculations.Thesehaveadirectinfluenceon umjunctiontemperature.Otherfactors,suchasairflowand umambienttemperature,areoftendeterminedbysystemconsiderations.Itisimportanttorememberthatthesecalculationsdonotincludetheeffectsofadjacentheatsources,andenhancedorrestrictedairflow.AdditionofextraPCBcopperareaaroundthesedevicesis mendedtoreducethethermalimpedanceandmaintainthejunctiontemperatureaslowaspractical.ThelowerjunctiontemperaturesachievedbysolderingthepadimprovetheefficiencyandreliabilityofbothTPS20xxCandTPS20xxC-2partsandthesystem.ThefollowingexampleswereusedtodeterminetheθJACustomthermalimpedancesnotedintheTHERMALINFORMATIONtable.TheywerebasedonuseoftheJEDEChigh-kcircuitboardconstruction(2signaland2plane)with4,1oz.copperweight,layers.Whileitis mendedthattheDGNpackagePADbesolderedtocircuitboardcopperfillandviasforlowthermalimpedance,theremaybecaseswherethisisnotdesired.Forexample,useofroutingareaundertheIC.SomedevicesareavailableinpackageswithoutthePowerPad(DGK)specificallyforthispurpose.TheθJAfortheDGNpackagewiththepadnotsolderedandnoextracopper,isapproximay141°C/Wfor0.5-Aand1-Aratedparts,and139°C/Wforthe1.5-Aand2-Aratedparts.TheθJAfortheDGKmountedperFigure45is110.3C/W.ThesevaluesmaybeusedinEquation1todeterminethe umjunctiontemperature.&3x0.018in

0.050in4x0.01in

GND:0.056in2total&3x0.018in 0.050inVIN:&3x0.018in

VOUT:0.041in2

&2x0.018in

VOUT:0.048in2totalarea5x0.01inviasFigure43.DBVPackagePCBLayout Figure44.DGNPackagePCBLayout0.100x&518mil0.185x&318mil0.100x&318milviasinnerplane

0.08x0.15x

50mil10mil 10milFigure45.DGKPackagePCBLayoutThefollowingprocedurerequiresiterationbecausepowerlossisduetotheinternalMOSFETI2×RDS(ON),andRDS(ON)isafunctionofthejunctiontemperature.Asaninitialestimate,usetheRDS(ON)at125°CfromtheTYPICALCHARACTERISTICS,andthepreferredpackagethermal forthepreferredboardconstructionfromtheTHERMALINFORMATIONtable.TJ=TA+((IOUT2xRDS(ON))x IOUT=ratedOUTpincurrentRDS(ON)=Powerswitchon- atanassumedTJ(Ω)TA= umambienttemperature(°C)TJ= umjunctiontemperature(°C)θJA=Thermal IfthecalculatedTJissubstantiallydifferentfromtheoriginalassumption,estimateanewvalueofRDS(ON)usingthetypicalcharacteristicplotandrecalculate.IftheresultingTJisnotlessthan125°C,tryaPCBconstructionand/orpackagewithlowerθJAREVISIONChangesfromOriginal(June2011)toRevision 在整個(gè)數(shù)據(jù)表中添加了DGK封裝信 將TPS2051C、TPS2065C、和TPS2069C器件的狀態(tài)從：預(yù)覽改為：激 Correctedpinoutnumbersforthe5-PIN ChangesfromRevisionA(July2011)toRevision ChangedtitleofFigure17From:NEWFIGTo:TPS2065C50ΩShort ChangesfromRevisionB(September2011)toRevision Changed在表1中，TPS2000C(MSOP-8)的狀態(tài)從：預(yù)覽改為：激 ChangedFrom:PXF1To:PXFIandFrom:PSG1To:PXGIintheDEVICEINFORMATIONtableMOSP-8(DGK) ChangedtheθJACustom2ARatedDGKvaluefromN/Ato AddedFigure45-DGKPackagePCBLayout ChangesfromRevisionC(October2011)toRevision 經(jīng)UL檢測(cè)和認(rèn)證的添加的特性和和CB認(rèn)證-文件號(hào)E169910（參見表 添加了表注釋2，經(jīng)UL檢測(cè)和認(rèn)證且CB認(rèn)證完整 AddedVHandVILinformationtotheROC ChangesfromRevisionD(February2012)toRevision ChangedthePOWERDISSIPATIONANDJUNCTIONTEMPERATUREsection.Replacedparagraph"Whileitis ChangesfromRevisionE(April2012)toRevision Added器件TPS20xxC- 將特性從：當(dāng)TPS20XXC被禁用時(shí)輸出放電改為：已選擇具有(TPS20xxC)和沒有(TPS20xxC-2)輸出放電的部 將TPS2041C，TPS2061C，TPS2065C-2，TPS2068C和TPS2069C-2添加到表1并刪除產(chǎn)品預(yù) 添加了TPS2069C-2器 AddeddevicesTPS2041C,TPS2061C,TPS2065C-2,TPS2068C,andTPS2069C-2totheDeviceInformation AddedPXKIintheDEVICEINFORMATIONtableSOT23-5(DBV)column AddedNote1to MENDEDOPERATINGCONDITIONS AddedTPS2041C,TPS2061C,TPS2068C,TPS2065C-2andTPS2069C-2devicestoIOUTintheMENDEDOPERATINGCONDITIONS AddedtheDBVoptiontoPowerSwitchRDS(on)1.5Aratedoutput,25°C AddedtheDBVoptiontoPowerSwitchRDS(on)1.5Arated ChangedISOCurrent AddedLeakage AddedtheDBVoptiontoPowerSwitchRDS(on)1.5Arated ChangedISOCurrent AddedLeakage ChangedthesecondparagraphoftheENABLE AddedsentencetoendofparagraphintheOUTPUTDISCHARGE ChangesfromRevisionF(August2012)toRevision 從特性中刪除：（請(qǐng)見表1）：經(jīng)UL檢測(cè)和認(rèn)證以及CB認(rèn)證-文件號(hào) 從表1：“經(jīng)UL檢測(cè)和認(rèn)證并且CB完整 ChangedFrom:PXKITo:PYKIintheDEVICEINFORMATIONtableSOT23-5(DBV)column PACKAGINGOrderablePackageEcoMSLPeakOpTempiceSOT-5&noSb/Br)CULevel-2-260C-1-40to 8&noSb/Br)CULevel-2-260C-1-40to 8&noSb/Br)CULevel-2-260C-1-40to 8&noSb/Br)CUNIPDAU|Level-2-260C-1-40to 8&noSb/Br)CUNIPDAU|Level-2-260C-1-40to 8&noSb/Br)CULevel-2-260C-1-40to 8&noSb/Br)CULevel-2-260C-1-40to 8&noSb/Br)CUNIPDAU|Level-2-260C-1-40to 8&noSb/Br)CUNIPDAU|Level-2-260C-1-40to SOT-5&noSb/Br)CULevel-2-260C-1-40to SOT-5&noSb/Br)CULevel-2-260C-1-40to SOT-5&noSb/Br)CULevel-2-260C-1-40to SOT-5&noSb/Br)CULevel-2-260C-1-40to SOT-5&noSb/Br)CULevel-2-260C-1-40to SOT-5&noSb/Br)CULevel-2-260C-1-40to 8&noSb/Br)CULevel-2-260C-1-40to 8GreenCULevel-2-260C-1-40to&noPACKAGEOPTION23-Dec-OrderablePackageEcoMSLPeakOpTempDeviceSOT-5&noSb/Br)CULevel-2-260C-1-40toTPS2065CDBVR-SOT-5&noSb/Br)CULevel-2-260C-1-40toSOT-5&noSb/Br)CULevel-2-260C-1-40toTPS2065CDBVT-SOT-5&noSb/Br)CULevel-2-260C-1-40to8&noSb/Br)CUNIPDAU|Level-2-260C-1-40toTPS2065CDGN-8&noSb/Br)CULevel-2-260C-1-40to8&noSb/Br)CUNIPDAU|Level-2-260C-1-40toTPS2065CDGNR-8&noSb/Br)CULevel-2-260C-1-40to8&noSb/Br)CULevel-2-260C-1-40to8&noSb/Br)CULevel-2-260C-1-40toSOT-5&noSb/Br)CULevel-2-260C-1-40toSOT-5&noSb/Br)CULevel-