薄型小外形尺寸晶体管tsot23封装内的2.25mhz300ma降压转换器

TPS62242-ZHCS843A–MARCH2011–REVISEDMARCHTPS62242-查询样品:TPS62242-特 应用范 汽车应 蓝牙™耳器件温度2 器件模型(HBM)静电放电(ESD)分类等 器件充电器件模型(CDM)ESD分类等级 便携式

TPS62242-Q1器件是一款针对电池供电类便携式应用进行了优化的高效同步降压转换器。它使用一个单一典型值为15μA的静态电 借助于2V至6V的输入电压范围，此器件支持由具针对最低压降的100%占空 采用TSOT23封 池、3.3V和5V输入电压电源轨供电的应用此省电模式针对低输出电压纹波进行了优化。在关断1μAPleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsTexasInstrumentssemiconductorproductsand erstheretoappearsattheendofthisdataPowerPADisatrademarkofTexas蓝牙isatrademarkofBluetoothSIGCopyright©2011–2012,TexasInstrumentsPRODUCTIONDATAinformationiscurrentasofpublicationdate.ProductsconformtospecificationspertheCopyright©2011–2012,TexasInstrumentsInstrumentsstandardwarranty.Productionprocessingdoes EnglishDataSheet:necessarilyincludetestingofallVI=2IVI=V=VI=2IVI=V=280VI=3V=IVI=VI=V=1.8V,L=2.2H,DCR110mΩVIN2.0Vto

TPS62242- 2.2

UptoEfficiency-Efficiency-0 IO-OutputCurrent-Thesedeviceshavelimitedbuilt-inESDprotection.TheleadsshouldbeshortedtogetherorthedevicecedinconductivefoamduringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates.ORDERINGORDERABLEPARTTOP-SIDE–40°CtoTSOT23-5–Reelof(1)Forthemostcurrentpackageandorderinginformation,seethePackageOptionAddendumattheendofthis,orseetheTIwebsiteat UMoveroperating-airtemperaturerange(unlessotherwise Inputvoltage–0.3toVVoltagerangeat–0.3toVIN+0.3,VVoltageon–0.3toVPeakoutputInternallyAESDHumanBodyModel(HBM)AEC-Q100ClassificationLevelH22ChargedDeviceModel(CDM)AEC-Q100ClassificationLevelC3BV umoperatingjunction–40to Storagetemperature-65toStressesbeyondthoselistedunderabsoluteumratingsmaycausepermanentdamagetothedevice.Thesearestressratingsonlyandfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunder mendedoperatingconditionsisnotimplied.Exposuretoabsolute–um–ratedconditionsforextendedperiodsmayaffectdevicereliability.AllvoltagevaluesarewithrespecttonetworkgroundThehumanbodymodelisa100-pFcapacitordischargedthrougha1.5kΩresistorintoeachpin.Themachinemodelisa200-pFcapacitordischargeddirectlyintoeachpin.DISSIPATIONFORTA≤25°CABOVETA=25°C4004MENDEDOPERATINGoveroperating-airtemperaturerange(unlessotherwiseSupplyvoltage,26VOutputvoltagerangeforadjustable VOperatingambientOperatingjunctionELECTRICALOverfulloperatingambienttemperaturerange,typicalvaluesareatTA=25°C.Unlessotherwisenoted,specificationsapplyforconditionVIN=EN=3.6V.ExternalcomponentsCIN=4,7μF0603,COUT=10μF0603,L=2.2μH,refertoparametermeasurementinformation.TESTInputvoltage26VOutput2.3V≤VIN≤62V≤VIN≤2.3OperatingquiescentIOUT=0mA.PFMmodeenabled,devicenotIOUT=0mA.PFMmodeenabled,deviceswitching,VOUT=1.8V,(1)IOUT=0mA,switchingwithnoload,operation,VOUT=1.8V,VIN=3VShutdownEN= TA=5UndervoltagelockoutVENABLE,Highlevelinputvoltage,2V≤VIN≤61VLowlevelinputvoltage,2V≤VIN≤60VTA=VInputbiascurrent, POWERHighsideMOSFETon-VIN=VGS=3.6V,TA=LowsideMOSFETon-ILForwardcurrentlimitMOSFEThigh-sideandlowsideVIN=VGS=3.6V,TA=ATA=–40°CtoThermalIncreasingjunctionThermalshutdownDecreasingjunctionOscillator2V≤≤62OutputVReferenceTA=Feedbackoperation,2V≤VIN≤6V,infixedoutputvoltageversionsVFB=VOUT,See(2)TA=FeedbackvoltagePFMDeviceinPFMLoad-tStartStart-upTimefromactiveENtoreach95%ofVOUTVOUTrampUPTimetorampfrom5%to95%ofLeakagecurrentintoSWVIN=3.6V,VIN=VOUT=VSW,EN= TA=SeetheparametermeasurementforVN=VO+Infixedoutputvoltageversions,theinternalresistordividernetworkisdisconnectedfromFBPIN

(TOPVIEW)1515234RRTERMINAL1VINpowersupply2GNDsupply3IThisistheenablepinofthedevice.Pullingthispintolowsthedeviceintoshutdownmode.Pullingthispintohighenablesthedevice.Thispinmustbeterminated.5ThisistheswitchpinandisconnectedtotheinternalMOSFETswitches.Connecttheinductortothis4IFeedbackPinfortheinternalregulationloop.Connecttheexternalresistordividertothispin.Incaseoffixedoutputvoltageoption,connectthispindirectlytotheoutputcapacitor.LimitLimitLimitPFM0.6VErrorAmpLimitShootPARAMETERMEASUREMENT VIN2.0Vto

2.2

UptoTYPICALTable1.TableofvsOutputcurrent,PowerSaveFigurevsOutputcurrent,dvsOutputvsOutputOutputvoltagevsOutputcurrent,TA=FigurevsOutputcurrent,TA=FigurevsOutputcurrent,TA=FigurevsOutputcurrent,TA=vsOutputcurrent,TA=vsOutputcurrent,TA=StartupFigureTypicalModewithVO=1.8VFigurePFMModewithVO=FigurePFMModeFigurePFMload1mAto50mAwithVO=Figure20mAto200mAwithVO=Figure50mAto200mAwithVO=PFMlineIO=50mA,3.6VtoFigureIO=250mA,3.6VtoFigureModePFMtoFiguretoPFMFigureShutdownCurrentintovsInputVoltage,(TA=85°C,TA=25°C,TA=-FigureQuiescentvsInputVoltage,(TA=85°C,TA=25°C,TA=-FigureStaticDrain-SourceOn-vsInputVoltage,(TA=85°C,TA=25°C,TA=-FigureFigureEfficiencyEfficiency-0

EFFICIENCY(PowerSave OUTPUT OUTPUTEfficiencyEfficiency− IO-OutputCurrent- IO−OutputCurrent−Figure FigureVOVO-OutputVoltageDC-

OUTPUTVOLTAGE OUTPUTVOLTAGE OUTPUT OUTPUTVOVO-OutputVoltageDC- IO-OutputCurrent-

IO-OutputCurrent-Figure FigureVOVO-OutputVoltageDC-

OUTPUTVOLTAGEOUTPUT STARTUP

IintoIO-OutputCurrent- TimeBaseFigure FigureTYPICAL TYPICAL MODE PFMTimeBase- TimeBase-Figure FigurePFMMODE PFMLOADVVV3.6V;V1.8V,IL4.7H,C10FMODEVVTimeBase- TimeBase-Figure FigurePFMLOAD PFMLINEVTimebase- TimeBase-Figure FigureMODEPFMLINE PFMtoTimeBase- TimeBase-Figure FigureSHUTDOWNCURRENTINTOMODE toPFM INPUTISDISD-ShutdownCurrentIntoVIN−TimeBase-

VIN−InputVoltage−Figure FigureQUIESCENT STATICDRAIN-SOURCEON-STATE INPUT INPUTT=-T=-ATA=25T=AHighSide−IQIQ–QuiescentCurrent–RDS(on)RDS(on)-StaticDrain-SourceOn- 8

VINInputVoltage VIN−InputVoltage−Figure FigureSTATICDRAIN-SOURCEON-STATEINPUTTATA=-40TA=25TA=85LowSide−RDS(on)RDS(on)-StaticDrain-SourceOn-0 VIN−InputVoltage−FigureDETAILEDTheTPS62242-Q1stepdownconverteroperateswithtypically2.25MHzfixedfrequencypulsewidthmodulation()atmoderatetoheavyloadcurrents.Atlightloadcurrents,theconvertercanautomaticallyenterPowerSaveModeandoperatestheninPFMmode.Duringoperation,theconverterusesauniquefastresponsevoltagemodecontrolschemewithinputvoltagefeed-forwardtoachievegoodlineandloadregulation,allowingtheuseofsmallceramicinputandoutputcapacitors.Atthebeginningofeachclockcycleinitiatedbytheclocksignal,theHighSideMOSFETswitchisturnedon.ThecurrentthenflowsfromtheinputcapacitorviatheHighSideMOSFETswitchthroughtheinductortotheoutputcapacitorandload.Duringthisphase,thecurrentrampsupuntilthecomparatortripsandthecontrollogicturnsofftheswitch.ThecurrentlimitcomparatoralsoturnsofftheswitchifthecurrentlimitoftheHighSideMOSFETswitchisexceeded.Afteradeadtimepreventingshootthroughcurrent,theLowSideMOSFETrectifieristurnedonandtheinductorcurrentrampsdown.Thecurrentthenflowsfromtheinductortotheoutputcapacitorandtotheload.ItreturnsbacktotheinductorthroughtheLowSideMOSFETrectifier.ThenextcycleisinitiatedbytheclocksignalagainturningofftheLowSideMOSFETrectifierandturningontheHighSideMOSFETswitch.POWERSAVEThePowerSaveModeisenabled.Iftheloadcurrentdecreases,theconverterwillenterPowerSaveModeoperationautomatically.DuringPowerSaveMode,theconverterskipsswitchingandoperateswithreducedfrequencyinPFMmodewithaminimumquiescentcurrenttomaintainhighefficiency.Thetransitionfrom modetoPFMmodeoccursoncetheinductorcurrentintheLowSideMOSFETswitcheszero,whichindicatesdiscontinuousconductionmode.DuringthePowerSaveMode,theoutputvoltageismonitoredwithaPFMcomparator.AstheoutputvoltagefallsbelowthePFMcomparatorthresholdofVOUTnominal,thedevicestartsaPFMcurrentpulse.TheHighSideMOSFETswitchwillturnon,andtheinductorcurrentrampsup.AftertheOn-timeexpires,theswitchisturnedoffandtheLowSideMOSFETswitchisturnedonuntiltheinductorcurrent eszero.Theconvertereffectivelydeliversacurrenttotheoutputcapacitorandtheload.Iftheloadisbelowthedeliveredcurrent,theoutputvoltagewillrise.IftheoutputvoltageisequaltoorgreaterthanthePFMcomparatorthreshold,thedevicestopsswitchingandentersasleepmodewithtypical15-μAcurrentconsumption.IftheoutputvoltageisstillbelowthePFMcomparatorthreshold,asequenceoffurtherPFMcurrentpulsesaregenerateduntilthePFMcomparatorthresholdisreached.TheconverterstartsswitchingagainoncetheoutputvoltagedropsbelowthePFMcomparatorthreshold.Withafastsingle-thresholdcomparator,theoutputvoltagerippleduringPFMmodeoperationcanbekepttoaminimum.ThePFMPulseistimecontrolled,allowingtheusertomodifythechargetransferredtotheoutputcapacitorbythevalueoftheinductor.TheresultingPFMoutputvoltagerippleandPFMfrequencybothdependonthesizeoftheoutputcapacitorandtheinductorvalue.Increasingoutputcapacitorvaluesandinductorvalueswillminimizetheoutputripple.ThePFMfrequencydecreaseswithsmallerinductorvaluesandincreaseswithlargerIftheoutputcurrentcannotbesupportedinPFMmode,thedeviceexitsPFMmodeand Output Lightload PFMMode

moderatetoheavyload

VOUT+Figure20.PowerSave100%DutyCycleLowDropoutThedevicestartstoenter100%dutycyclemodeoncetheinputvoltagecomesclosetothenominaloutputvoltage.Inordertomaintaintheoutputvoltage,theHighSideMOSFETswitchisturnedon100%foroneormorecycles.WithfurtherdecreasingVINtheHighSideMOSFETswitchisturnedoncompley.Inthiscasetheconverteroffersalowinput-to-outputvoltagedifference.Thisisparticularlyusefulinbattery-poweredapplicationstoachievelongestoperationtimebytakingfulladvantageoftheentirebatteryvoltagerange.Theminimuminputvoltagetomaintainregulationdependsontheloadcurrentandoutputvoltage,andcanbecalculatedas:VINmin=VOmax+IOmax×®DSo(n)max+IOmax= umoutputcurrentplusinductorripplecurrentRDS(on)max= umP-channelswitchRDS(on).RL= oftheVOmax=nominaloutputvoltage umoutputvoltageUNDERVOLTAGETheundervoltagelockoutcircuitpreventsthedevicefrommalfunctioningatlowinputvoltagesandfromexcessivedischargeofthebatteryanddisablestheoutputstageoftheconverter.Theundervoltagelockoutthresholdistypically1.85VwithfallingVIN.ThedeviceisenabledbysettingtheENpintohigh.DuringthestartuptimetStartUp,theinternalcircuitsaresettledandthesoftstartcircuitisactivated.TheENinputcanbeusedtocontrolpowersequencinginasystemwithvariousdc/dcconverters.TheENpincanbeconnectedtotheoutputofanotherconverter,todrivetheENpinhighandgettingasequencingofsupplyrails.WithENpin=GND,thedeviceentersshutdownmodeinwhichallcircuitsaredisabled.Infixedoutputvoltageversions,theinternalresistordividernetworkisthendisconnectedfromFBpin.SOFTTheTPS62242-Q1hasaninternalsoftstartcircuitthatcontrolstherampupoftheoutputvoltage.Theoutputvoltagerampsupfrom5%to95%ofitsnominalvaluewithintypical250μs.Thislimitstheinrushcurrentintheconverterduringrampupandpreventspossibleinputvoltagedropswhenabatteryorhighimpedancepowersourceisused.Thesoftstartcircuitisenabledwithinthestartuptime,tStartup.SHORT-CIRCUITTheHighSideandLowSideMOSFETswitchesareshort-circuitprotectedwith umswitchcurrentequaltoILIMF.Thecurrentintheswitchesismonitoredbycurrentlimitcomparators.OncethecurrentintheHighSideMOSFETswitchexceedsthethresholdofit'scurrentlimitcomparator,itturnsoffandtheLowSideMOSFETswitchisactivatedtorampdownthecurrentintheinductorandHighSideMOSFETswitch.TheHighSideMOSFETswitchcanonlyturnonagain,oncethecurrentintheLowSideMOSFETswitchhasdecreasedbelowthethresholdofitscurrentlimitcomparator.THERMALAssoonasthejunctiontemperature,TJ,exceedsTBD(typical)thedevicegoesintothermalshutdown.Inthismode,theHighSideandLowSideMOSFETsareturnedoff.Thedevicecontinuesitsoperationwhenthejunctiontemperaturefallsbelowthethermalshutdownhysteresis.VIN2.0Vto

APPLICATION 2.2

Upto300mA10Figure21.Fixed1.2OUTPUTFILTERDESIGN(INDUCTORANDOUTPUTTheTPS62242-Q1isdesignedtooperatewithinductorsintherangeof1.5μHto4.7μHandwithoutputcapacitorsintherangeof4.7μFto22μF.Thepartisoptimizedforoperationwitha2.2μHinductorand10μFoutputcapacitor.Largerorsmallerinductorvaluescanbeusedtooptimizetheperformanceofthedeviceforspecificoperationconditions.Forstableoperation,theLandCvaluesoftheoutputfiltermaynotfallbelow1μHeffectiveInductanceand3.5μFeffectivecapacitance.SelectinglargercapacitorsislesscriticalbecausethecornerfrequencyoftheL-Cfiltermovestolowerfrequencieswithfewerstabilityproblems.InductorTheinductorvaluehasadirecteffectontheripplecurrent.Theselectedinductormustberatedforitsandsaturationcurrent.Theinductorripplecurrent(ΔIL)decreaseswithhigherinductanceandincreaseswithhigherVIorVO.TheinductorselectionalsohasanimpactontheoutputvoltagerippleinthePFMmode.HigherinductorvalueswillleadtoloweroutputvoltagerippleandhigherPFMfrequency,andlowerinductorvalueswillleadtoahigheroutputvoltageripplebutlowerPFMfrequency.Equation1calculatesthe uminductorcurrentin modeunderstaticloadconditions.Thesaturationcurrentoftheinductorshouldberatedhigherthanthe uminductorcurrentascalculatedwithEquation2.This

f=SwitchingFrequency(2.25MHztypical)L=InductorValueΔIL=PeaktoPeakinductorripplecurrentILmax= umInductorcurrentAmoreconservativeapproachistoselecttheinductorcurrentratingjustforthe umswitchcurrentlimitILIMFoftheconverter.Acceptinglargervaluesofripplecurrentallowstheuseoflowinductancevalues,butresultsinhigheroutputvoltageripple,greatercorelosses,andloweroutputcurrentcapability.Thetotallossesofthecoilhaveastrongimpactontheefficiencyofthedc/dcconversionandconsistofboththelossesinthedc (R(DC))andthefollowingfrequency-dependentcomponents:Thelossesinthecorematerial(magnetichysteresisloss,especiallyathighswitchingAdditionallossesintheconductorfromtheskineffect(currentdiscementathighMagneticfieldlossesoftheneighboringwindings(proximityRadiationTable2.ListofDIMENSIONSINDUCTANCEINDUCTORR2.5×2.0×2.5×2.0×KSLI-Hitachi3×3×OutputCapacitorTheadvancedfast-responsevoltagemodecontrolschemeoftheTPS62242-Q1allowstheuseoftinyceramiccapacitors.CeramiccapacitorswithlowESRvalueshavethelowestoutputvoltagerippleandaremended.TheoutputcapacitorrequireseitheranX7RorX5Rdielectric.Y5VandZ5Udielectriccapacitors,asidefromtheirwidevariationincapacitanceovertemperature, eresistiveathighfrequencies.Atnominalloadcurrent,thedeviceoperatesin modeandtheRMSripplecurrentiscalculatedas:

1 Atnominalloadcurrent,thedeviceoperatesin modeandtheoveralloutputvoltagerippleisthesumofthevoltageecausedbytheoutputcapacitorESRplusthevoltageripplecausedbycharginganddischargingtheoutputcapacitor:

1 1

Atlightloadcurrents,theconverteroperatesinPowerSaveModeandtheoutputvoltagerippledependsontheoutputcapacitorandinductorvalue.LargeroutputcapacitorandinductorvaluesminimizethevoltagerippleinPFMmodeandtightendcoutputaccuracyinPFMmode.InputCapacitorThebuckconverterhasanaturalpulsatinginputcurrent;therefore,alowESRinputcapacitorisrequiredforbestinputvoltagefiltering,andminimizingtheinterferencewithothercircuitscausedbyhighinputvoltagees.Formostapplications,a4.7-μFto10-μFceramiccapacitoris mended.Becauseceramiccapacitorsloseupto80%oftheirinitialcapacitanceat5V,itis mendedthata10-μFinputcapacitorbeusedforinputvoltagesgreaterthan4.5V.Theinputcapacitorcanbeincreasedwithoutanylimitforbetterinputvoltagefiltering.Takecarewhenusingonlysmallceramicinputcapacitors.Whenaceramiccapacitorisusedattheinput,andthepowerisbeingdthroughlongwires,suchasfromawalladapter,aloadstepattheoutput,orVINstepontheinput,caninduceringingattheVINpin.Theringingcancoupletotheoutputandbemistakenasloopinstability,orcouldevendamagethepartbyexceedingthe umratingsTable3.ListofR0603:0603:LAYOUTAsforallswitchingpowers,thelayoutisanimportantstepinthedesign.ProperfunctionofthedevicedemandscarefulattentiontoPCBlayout.Caremustbetakeninboardlayouttogetthespecifiedperformance.Ifthelayoutisnotcarefullydone,theregulatorcouldshowpoorlineand/orloadregulation,andadditionalstabilityissuesaswellasEMIproblems.Itiscriticaltoprovidealowinductance,impedancegroundpath.Therefore,usewideandshorttracesforthemaincurrentpaths.TheinputcapacitorshouldbecedascloseaspossibletotheICpinsaswellastheinductorandoutputcapacitor.ConnecttheGNDpinofthedevicetothePowerPAD™landofthePCBandusethispadasastarpoint.UseacommonPowerGNDnodeandadifferentnodefortheSignalGNDtominimizetheeffectsofgroundnoise.ConnectthesegroundnodestogethertothePowerPADland(starpoint)underneaththeIC.KeepthecommonpathtotheGNDpin,whichreturnsthesmallsignalcomponents,andthehighcurrentoftheoutputcapacitorsasshortaspossibletoavoidgroundnoise.TheFBlineshouldbeconnectedrighttotheoutputcapacitorandroutedawayfromnoisycomponentsandtraces(forexample,theSWline).PACKAGEOPTION5-Apr-PACKAGINGOrderableStatusPackagePackageEconMSLPeak5&noSb/Br)CULevel-1-260C-(1)ThemarketingstatusvaluesaredefinedasACTIVE:Product mendedfornewLIFEBUY:TIhasannouncedthatthedevicewillbedis,andalifetime-buyperiodisinNRND: mendedfornewdesigns.Deviceisinproductiontosupportexistingcustomers,butTIdoes mendusingthispartinanewPREVIEW:Devicehasbeenannouncedbutisnotinproduction.SamplesmayormaynotbeOBSOLETE:TIhasdistheproductionofthe(2)Econ-Thennedeco-friendlyclassification:Pb- (RoHS),Pb- (RoHSExempt),orGreen(RoHS&noSb/Br)-pleasecheck /productcontentforthelatestavailabilityinformationandadditionalproductcontentdetails.TBD:ThePb-/Green nhasnotbeenPb-(RoHS):TI'sterms"Lead- "or"Pb- "meansemiconductorproductsthatarecompatiblewiththecurrentRoHSrequirementsforall6substances,includingtherequirementthatleadnotexceed0.1%byweightinhomogeneousmaterials.Wheredesignedtobesolderedathightemperatures,TIPb- productsaresuitableforuseinspecifiedlead-processes.Pb-(RoHSExempt):ThiscomponenthasaRoHSexemptionforeither1)lead-basedflip-chipsolderbumpsusedbetweenthedieandpackage,or2)lead-baseddieadhesiveusedbetweenthedieandleadframe.ThecomponentisotherwiseconsideredPb-(RoHScompatible)asdefinedabove.Green(RoHS&noSb/Br):TIdefines"Green"tomeanPb-(RoHScompatible),andofBromine(Br)andAntimony(Sb)basedflameretardants(BrorSbdonotexceed0.1%byweightinhomogeneousmaterial)(3)MSL,PeakTemp.--TheMoistureSensitivityLevelratingaccordingtotheJEDECindustrystandardclassifications,andpeaksolderImportantInformationandDier:TheinformationprovidedonthispagerepresentsTI'sknowledgeandbeliefasofthedatethatitisprovid