設(shè)計(jì)參考源碼手冊(cè)1746個(gè)zhcs

ZHCS239–AUGUST800mA800mA查詢樣品:特 應(yīng)用范 智能 MP3 NTC

bq24212是一款面向空間受限的便攜式應(yīng)用的高集成度鋰離子電池充電器。具有輸入過(guò)壓保護(hù)功能的高輸入電壓范圍支持低成本的非穩(wěn)壓適配器。具有可編程PRODUCT采用小型2mm×3mmSON-10封 PRODUCT壓。在所有充電階段，內(nèi)部控制環(huán)路都會(huì)IC結(jié)20V CHG` 74TS 3Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofInstrumentsInstrumentssemiconductorproductsanderstheretoappearsattheendofthisdataCopyright?2011,TexasInstrumentsPRODUCTPREVIEWinformationconcernsproductsintheformativeordesignphaseCopyright?2011,TexasInstrumentsotherspecificationsaredesigngoals.TexasInstruments EnglishDataSheet:therighttochangeordiscontinuetheseproductswithoutPRODUCTPRODUCTThesedeviceshavelimitedbuilt-inESDprotection.TheleadsshouldbeshortedtogetherorthedevicecedinconductivefoamduringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates.DESCRIPTION(Thechargerpowerstageandchargecurrentsensefunctionsarefullyintegrated.Thechargerfunctionhashighaccuracycurrentandvoltageregulationloops,chargestatusdisy,andchargeterminationfunction.Thechargecurrentvalueisprogrbleviaanexternalresistor.Furthermore,theIChasaLoadModethatconnectsthebatterytoVBUSpinwithcurrentlimitingfunctiontopreventoverload.TouseLoadMode,thechargingsourcewouldberemovedfromtheVBUSpin.ThenaloadcanbecedonVBUSpinanditwillbeneartheVBATpinvoltage.PINFigure1.DQC1BAT1BAT2VDPM3CHG4MODE5PGPIN1ForChargingMode,inputforchargingsource,connecttoexternalDCsupply(ieSolarPanel,InductivechargingPAD,orWallAdapter)ForLoadMode,outputforcurrentlimitedbatteryvoltage.Expectedrangeofbypasscapacitors1μFto10μF,connectedfromVBUStoVSS.BatteryConnection.SystemLoadmaybeconnected.Expectedrangeofbypasscapacitors1μFto10μF,connectedfromBATtoVSS.9IProgramstheinputvoltageregulationthreshold.Expectedrangeofprogrammingresistoris1kto10kΩ,connectedfromVDPMtoVSS.WhenVDPMisfloating,theVINDPMloopoperatesinbatterytrackingmode,andtheVINDPMthresholdisBAT+100mV(BAT>3.6V)or3.7V(BAT≤3.6V)inthiscase.VINDPMthresholdshouldbeprogrammedhigherthanbatteryvoltagetoensureproperoperation.2IProgramstheFast-chargecurrentsetting.ExternalresistorfromISETtoVSSdefinesfastchargecurrent6OPowerPresentindication.LOW(FETON)Wheninputvoltageisinnormalrange(VBUS>BAT&VBUS>UVLO),Highimpedance(opendrainFETOFF)inothercases.5ITemperaturesensepin,connectedtoNTCThermistorinthebatterypack.PullingHighputspartinLimitedPowerchargingmode.Mustnotbeleftfloating.3–Ground8OChargeStatusindication,Low(FETON)indicatescharging,andHighimpedance(opendrainFETOFF)inothercases7IModecontrol.LowtoenableChargeModeorHightoenableLoad4OTSbiasreferencevoltagepin,regulatedoutput.NoexternalcapacitorisrequiredfromVTSBtoVSS.Onlyenabledduringcharge.––ThereisaninternalelectricalconnectionbetweentheexposedthermalpadandtheVSSpinofthedevice.ThethermalpadmustbeconnectedtothesamepotentialastheVSSpinontheprintedcircuitboard.Donotusethethermalpadastheprimarygroundinputforthedevice.VSSpinmustbeconnectedtogroundatalltimes.PRODUCTPRODUCTTYPICALSOLARAPPLICATION120VCHG` TiedLowtoenableChargeModeVTSBTS923ShortforLimitedPowerChargingModeOpenforBatteryTrackingModeFigure2.TypicalSystemSchematicforSolarCharger20V1CHG` TiedLowtoenableChargeModeVTSBTS923ShortforLimitedPowerChargingModeOpenforBatteryTrackingModeFigure3.SystemSchematicforSolarChargerApplicationwithMinimumPRODUCTPRODUCT UMoveroperatingtemperaturerange(unlessotherwiseInputVBUS(withrespectto–0.3toVBAT(withrespectto–0.3toVDPM,VTSB,ISET,TS,MODE,CHG,PG(withrespectto–0.3toInputAAOutputSinkCHG,Junctiontemperature,–40toStoragetemperature,–65to(1)Stressesbeyondthoselistedunderabsoluteumratingsmaycausepermanentdamagetothedevice.Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunder mendedoperatingconditionsisnotimplied.Exposuretoabsolute- um-ratedconditionsforextendedperiodsmayaffectdevicereliability.Allvoltagevaluesarewithrespecttothenetworkgroundterminalunlessotherwisenoted.THERMALTHERMALSON-10Junction-to-ambientthermalJunction-to-case(top)thermalJunction-to-boardthermalJunction-to-topcharacterizationJunction-to-boardcharacterizationJunction-to-case(bottom)thermal(1)有關(guān)傳統(tǒng)和新的熱度量的信息，請(qǐng)參閱IC封裝熱度量應(yīng)用報(bào)告SPRA953MENDEDOPERATINGINVoltageVINOperatingvoltagerange,RestrictedbyUVLOandInputcurrent,VBUSACurrent,BATAJunction0ProgramsinputvoltageregulationΩFast-chargecurrentprogrammingΩVoltageacrossNTCthermistorforBy-passcapacitoronBAT1By-passcapacitoronVBUS1By-passcapacitoronVTSBPRODUCTPRODUCTELECTRICALOverjunctiontemperaturerange0°C≤TJ≤125°C,VBUS=5V,Chargemode(EN=Low)(unlessotherwiseTESTUnder-voltagelock-outVBUS:0V→VHysteresisonVUVLOVBUS:4V→0V,VUVLO_FALL=VUVLO–VHYS-VBUS-InputPowerGooddetectionthresholdVBUSaboveBAT(InputpowergoodifVBUS>BAT+VBUS-DT);BAT=3.6V,VBUS:3.5V→4VVHYS-HysteresisonVBUS-DTBAT=3.6V,VBUS:4V→DeglitchtimeonexitingTimemeasuredfromVBUS:0V→5V1μsrise-timetoPG=Low,BAT=3.6VtDGL(PG_NO-DeglitchtimeonVHYS-VBUSDTpowerdown.Sameasenteringsleep.TimemeasuredfromVBUS:5V→3.2V1μsfall-timetoPG=OpenCircuitInputover-voltageprotectionVBUS:5V→VVHYS-HysteresisonVBUS:11V→Inputover-voltageblankingVBUS:5V→DeglitchtimeexitingTimemeasuredfromVBUS:12V→5V1μsfall-timetoPG=Low5ble,theprogrammingresistoratVDPMVBUS-RestrictsloutatVBUS-DPMRVDPM=Vble,theprogrammingresistoratVDPM5RVDPM=TermBAT>VLOWV,VBUS=5V,RVDPM=1kto10kΩ;RVDPM=KVBUS_DPM×InitialvoltageforVBUS_DPMthresholdBAT>VLOWV,VBUS=5V,RVDPM=1ktoVVBUS_DPMthresholdwhenVDPMisshortedtoVSSBAT>VLOWV,VBUS=5V,RVDPM<VCurrentforprogrammingBatteryvoltagetrackingthresholdforVBUSDPMloopVDPMpinFloat(opencircuit,RTS>500kΩ),BATrisingBAT≤VBAT>HysteresisforBATInputvoltagetoenableCHGpin,VBUS-VBUS_DPMorVBUS-MODE=LOW,VBUSrisingaboveVINDPMHysteresisforMODE=LOW,VBUSDeglitchtimeforCHGpinstatus5ISETSHORTCIRCUITHighestResistorvalueconsideredafault(short).MonitoredforIout>90mARiset:600Ω→250Ω,Ioutlatchesoff.CyclepowertoReset.Faultrange>1.10AΩtDGL-DeglitchtimetransitionfromISETShorttoIoutDisableClearfaultbycyclingINor1umOUTcurrentlimitregulationABATTERYSHORTSourcecurrentoutBATpinduringshort-circuitdetectionBATpinshort-circuitdetectionBAT:3V→0.5V,noVBAT(SC-BATpinShortRecovery→BAT(SC)+BAT(SC-HYS);Rising,noPRODUCTPRODUCTELECTRICALOverjunctiontemperaturerange0°C≤TJ≤125°C,VBUS=5V,Chargemode(EN=Low)(unlessotherwiseTESTQUIESCENTBATpincurrent,chargingMODE=Low,VBUS=6V,9SuspendcurrentintoBATMODE=Low,VBUS=0V,BAT=4.21SuspendcurrentintoVBUSMODE=High,VBUS=6V,BAT=4.2Activesupplycurrent,VBUSNoloadonVTSBpin,MODE=Low,VBUS=6V,noloadonBATpin,BAT>BAT(REG),ICActivesupplycurrent,BATpininLoadMODE=High,BAT=4V,noloadonVBUSBATTERYCHARGERFAST-BatteryregulationVBUS=5.5V,IOUT=25mA,(VTS_0C<VTS<VBatteryhotregulationVBUS=5.5V,IOUT=25mA,currentrangeVO(REG)>BAT>VLOWV,VBUS=5V,RISET=469to75kΩVDO(IN-Drop-Out,VBUS–AdjustVBUSdownuntilIOUT=0.5A,BAT=4.15V,RISET=675,TJ<100°C.Output"fastcharge"VO(REG)>BAT>VLOWV,VBUS=AFastchargecurrentRISET=KISET/IOUT;250mA≤IOUT<800RISET=KISET/IOUT;50mA≤ICHG<250RISET=KISET/IOUT;10<ICHG<50PRE-CHARGE–INTERNALLYPre-chargetofast-chargetransition3VDeglitchtimeonpre-chargetofast-chargetransitionDeglitchtimeonfast-chargetopre-chargetransitionIPRE-Pre-chargecurrent,InternallyBAT<VLOWV,ICHG≥250%TERMINATION–INTERNALLYTerminationcurrent,InternallyICHG≥2508%Deglitchtime,terminationRECHARGEORVTS_0C<VTS<VTS_45C,BAT:4.2V→VRechargedetectionthreshold-hotVTS_45C<VTS<VTS_60C,BAT:4.15V→VDeglitchtime,rechargethresholdVTS_0C<VTS<VTS_45C,BAT:4.25V→3.5Vin1μStDGL(RCH)istimetoISETDeglitchtime,rechargethresholdinBAT_DetectmodeVTS_0C<VTS<VTS_45C,BAT:3.5VtDGL(RCH)istimetoISETBATTERYDETECTIONBATReducedregulationduringbatteryVVTS_0C<VTS<VTS_45C,BatterySinkcurrentduring59RegulationtimeatVREGorHighbatterydetecionVTS_0C<VTS<VTS_45C,BatteryVLowbatterydetectionVTS_0C<VTS<VTS_45C,BatteryVBATTERYCHARGINGTIMERSANDFAULTPre-chargesafetytimerRestartswhenenteringPre-charge;Alwaysenabledwheninpre-charge.VTS<VSM(TS)sChargesafetytimerClearsfaultorresetsatUVLO,ENdisable,BATShort,exitingLOWVandRefreshsTerminationtimerinLimitedPowerChargemodeLimitedPowerChargemode,terminatechargewhenVINDPMactive,normalterminationconditionsmetandthistermerexpiressPRODUCTPRODUCTELECTRICALCHARACTERISTICS(Overjunctiontemperaturerange0°C≤TJ≤125°C,VBUS=5V,Chargemode(EN=Low)(unlessotherwiseTESTBATTERY-PACKNTCTSBiasIVTSB<12VIVTSBumcurrentfromTS-biaspin(shortcircuitprotection)1OptionalcapacitanceforOptionalcapacitanceforV0C-Hysteresison0C1V10C-Hysteresison10C1V45C-Hysteresison45C1V60C-Hysteresison60C1DeglitchforTSthresholds:Normaltocoldoperation:VTS:30%→50%ColdtoNormaloperation:VTS:50%→30%DeglitchforTSthresholds:BatteryLimitedPowerChargemodethreshold-VTS:0.4VTSB→VHYS-HysteresisexitingLimitedPowerChargemodeVTS:1.7V→5DeglitchexitLimitedPowerChargemodebetweenstatesBatteryDeglitchenterLimitedPowerChargemodebetweenstates8THERMALTemperatureregulationThermalshutdownTJ(OFF-ThermalshutdownLOGICLEVELSONLogicLOWinputSink8VLogicHIGHinputSource8VInternalpullMODE=1.41LOGICLEVELSONCHGANDOutputLOWISINK=5VLeakagecurrentintoVchg=5V,VPG=51LOADMODE(MODE=MinimumvoltageforLoadVVDO(BAT-Drop-Out,V(BAT)–AdjustVBUSdownuntilI(VBUS)=0.1A,BAT=4.15V,TJ<100°C.VBUS-Loadmodeexitingthreshold(VBUSaboveBAT)BAT=3.6V,VBUS:rising3V→0VHYS-HysteresisonVBUS-LMBAT=3.6V,VBUS:4V→DeglitchtimeonexitingloadtDGL(LM-DeglitchtimeonVHYS-VBUSLMsameasenteringloadmode5TheminimumloadcurrenttokeepICinloadmodeDuringloadInitialcurrentlimitinloadmodeforblankingtimetREV_LIMIT_BLKBAT=BlankingtimeforinitialcurrentReverseloadmodecurrentlimitaftertheinitialblankingtimePRODUCTPRODUCTELECTRICALCHARACTERISTICS(Overjunctiontemperaturerange0°C≤TJ≤125°C,VBUS=5V,Chargemode(EN=Low)(unlessotherwiseTEST DelaytimetosetloadcurrentlimittoReversecurrentdropsfrom100%to30%ofSleepVbusSleepVbus ++VOVPOVPLoadModeVbusVin VINDPM++ +VIN 125C+IREVTSTimerPowerIIN_

PRODUCTPRODUCTFigure4.FunctionalBlockPRODUCTPRODUCTDETAILEDFUNCTIONALThebq24212isahighlyintegrated2x3mm2singlecellLi-Ionchargerwithbi-directionalpowerflowcapability.Dependingonthestatusofcontrolpinsandsourceconditions,theICcanoperateinseveralmodes:Sleep,Charge,Load,andSuspendmode.Atpowerup(VBUSorBATrampsup,orMODEpinchangesstatus),theICperformstheoperationmodedetectionautomatically.DependingontheVBUSandBATlevels,theICenterssleep,charge,loadorsuspendInchargemode,thechargerhasthreephasesofcharging:Pre-chargetoreconditionafulldischargedbattery,fast-chargeconstantcurrenttosupplythebuckchargesafelyandvoltageregulationtosafelyreachfullcapacity,asshowninthechargeprofile.Thechargeoperatingmodeisveryflexible,allowingprogrammingofthefast-chargecurrent,andinputvoltageregulationthreshold.TheprogrbleinputvoltageregulationthresholdmakestheICcompatiblewithmanyalternativepowersources,suchassolarpanelorinductivechargingpad.InLoadMode,theICconnectsthebatteryvoltagetotheinputpin(VBUSpin)throughthebacktobackFET(Q1andQ2)topowertheloadconnectedatVBUSpin.Theloadcurrentislimitedtoprovideoverloadprotection.CCBattery CVCHG=HiInsleepmode,Q2isCCBattery CVCHG=HiVOFastChargeFigure5.ChargeOPERATIONMODEDETECTIONANDOnpowerup(VBUSorBATrampsup,orMODEpinchangesstatus),theICperformsoperationmodedetectiontoidentifytheoperationmodebasedontheMODEpin,VBUSvoltageandBATvoltage.Twocomparatorsareneededforthedetection,LoadModecomparatorandSleepModeWhenVBUSfallsbelowthelowerlimitoftheLoadModecomparatorandMODEishigh,theICgoestoLoadMode;WhenVBUSisabovetheupperlimitoftheSleepComparatorandMODEislow,theICgoestoChargeMode,asshowninFigure6.PRODUCTPRODUCTPowerUPPowerUPorMODEPinChangeVV Suspend V=V+V-V? LoadChargeFigure6.OperationModeDetectionFlowDuringLoadMode,whenVBUSisaboveupperlimitofLoadModeandtheloadcurrentisbelowtheminimumloadcurrent(ILM_MIN)orifMODEchangesfromhightolow,theICstaysinLoadModeforadeglitchtimeof100mSandthengoestosleepmode.IfVBUSisaboveupperlimitofSleepcomparatorduringthisperiod,after45μsdeglitchtime,theICstopsLoadModeandgoestochargemodeintotheumcurrenttobatteryislimitedbytheFETRDSonduringthisVVBAT+199VBAT+350VBAT-200Charge100-100<100LoadChargeFigure7.SleepComparatorDuringChargemode,ifVBUSfallstothelowerlimitofSleepcomparatororifMODEchangesfromlowtohigh,theICgoestosleepmodeafteradeglitchtimeof32mS.IfVBUSfallstobelowthelowerlimitofLoadModecomparator,theICgoestoLoadModeafteradeglitchtimeof32ms,asshowninthemodetransitiondiagrams:VBUS<VBAT+VBUSLMVHYS5SVBUS>VBAT+VVBUS45SVBUS<VBAT+VVBUSVBAT+VVBUS VHYS 32mSIBUS<ILM100mSVBUS<VBAT+VBUS32mSMODE=HIVBUS>VBAT+VVBUS45SFigure8.OperationModeTransitionInLoadMode,iftheloadishigherthanILM_MIN,orthevoltageatVBUSpinislowerthanupperlimitofLoadModecomparator,theLoadModeiscontinuous.IftheloadissmallerthanILM_MINinLoadMode,andVBUSishigherthantheupperlimit,thentheICgoestosleepmodeafterdeglitchtimeof100mS.Insleepmode,onceVBUSdropslowerthanthelowerlimitsoftheLoadModecomparator,theICgoestoLoadModeagain.Inthiscase,theaboveprocessrepeats,andICkeepschangingoperationsmode(betweenSleepmodeandLoadMode).Themodechangefrequencyislessthan10Hz,andVBUShasarippleof150mV.

PRODUCTFigure9.LoadModePRODUCTCHARGEPower-DownorUnder-VoltageLockoutTheICisinpowerdownmodeiftheVBUSandBATpinvoltagesarebothlessthanUVLO.Thepartisconsidered“dead”andallthepinsarehighimpedance.OncetheVBUSvoltagerisesabovetheUVLOthresholdtheICentersSleepModeoranactivemodedependingoncontrolpinstatusandtheBATpin(battery)voltage.PRODUCTPRODUCTTheICisaliveaftertheVBUSorBATvoltagerampsaboveUVLO(seesleepmode),theICresetsalllogicandtimers,andstartstoperformmanyofthecontinuousmonitoringroutines.TypicallytheinputvoltagequicklyrisesthroughtheUVLOandsleepstateswheretheICdeclarespowergood,startsthesafetytimer,enablestheCHGpin,andstartsthenormalchargeroutine.SleepIftheVBUSpinvoltageisbelowtheBATvoltageandabovetheUVLOthreshold,thechargecurrentisdisabled,thesafetytimercountingpauses(notreset)andthePGandCHGpinsarehighimpedance.AstheinputvoltagerisesandthechargerexitsSleepMode,thePGpingoeslow,thesafetytimercontinuestocount,chargeisenabled,andtheCHGpinremainshighimpedanceuntilcurrentflowsouttheBATpin.NewChargeAnewchargecycleisstartedwhenagoodpowersourceisapplied,whenperformingachargedisable/enable(MODEtoggle),whenexitingLimitedPowerChargeMode(LPCM),whendetectingabatteryinsertionorwhentheBATvoltagedropsbelowtheVRCHthreshold.TheCHGpinisactivelowonlyduringthefirstchargecycle,thereforeexitingLPCMoradropbelowVRCHwillnotturnontheCHGpinFET,iftheCHGpinisalreadyhighimpedance.Overvoltage-Protection(OVP)–ContinuouslyIftheinputsourceappliesanovervoltage,thepassFET,ifpreviouslyon,turnsoffafteradeglitch,tBLK(OVP).ThetimerendsandtheCHGandPGpingoestoahighimpedancestate.OncetheovervoltagereturnstoanormalvoltageandafteradeglitchtimeoftDGL(PG_OVP),thePGpingoeslow,timercontinues,chargecontinuesandtheCHGpingoeslowaftera25msdeglitch.PowerGoodIndicationAfterasourceisappliedtoVBUSandthevoltagerisesabovetheUVLOandsleepthresholds(VBUS>BAT+VBUS_DT)andVINDPMthreshold(VBUS_DPMorVTRK),butislessthanOVP(VBUS<VOVP),thenthePGFETturnsonandprovidesalowimpedancepathtoground.TheENpindoesnotchangethisCHGPinThechargepinhasaninternalopendrainFETwhichison(pullsdowntoVSS)duringthefirstchargeonly(unlessTSistiedtoVTSB)andisturnedoffoncethebatteryreachesvoltageregulationandthechargecurrenttaperstotheinternallysetterminationthreshold.ThechargepinishighimpedanceinsleepmodeandOVP(ifPGishighimpedance)andreturntoitspreviousstateoncetheconditionisremoved.Cyclinginputpower,togglingMODEpin,orreleasingorenteringpre-chargemodecausestheCHGpintogolowifpowerisgoodandadischargedbatteryisattached.Thisisconsideredthestartofafirstchargecycle.CHGandPGLEDPull-UpForhostmonitoring,apull-upresistorisusedbetweenthe"STATUS"pinandtheVCCofthehost.ForavisualindicationaresistorinserieswithanLEDisconnectedbetweenthe"STATUS"pinandapowersource.IftheCHGorPGsourceiscapableofexceeding7V,a6.2Vzeenershouldbeusedtoclampthevoltage.IfthesourceistheBATpin,notethatasthebatterychangesvoltage,andthebrightnessoftheLEDsvary.CHARGINGCHGFET/LED(VTS<CHGFET/LED(VTS>1stRefreshTEMPONfor1stChargewhenBAT<INPUTPOWERGOODPGNormalInputSleepOVPPGisindependentofchipInputVoltageBasedDynamicPowerManagement(VBUS-TheVBUS-DPMfeatureisusedtodetectaninputsourcevoltagethatisreachingitscurrentlimitduetoexcessiveloadandcausingtheinputvoltagetodrop.WhentheinputvoltagedropstotheVBUS-DPMthresholdtheinternalpassFETreducesthecurrentuntilthereisnofurtherdropinvoltageattheinput.ThispreventsasourcewithvoltagelessthanVBUS-DPMtopowertheBATpin.ThisuniquefeaturemakestheICworkwellwithcurrentlimitedpowersources,suchassolarpanelsorinductivechangingpads.Thisisalsoanaddedsafetyfeaturethathelpsprotectthesourcefromexcessiveloads.TheCharger’sBATpinprovidescurrenttothebatteryandtothesystem,ifpresent.ThisICcanbeusedtochargethebatterypluspowerthesystemorchargejustthebatteryassumingtheloadsdonotexceedtheavailablecurrent.TheBATpinisacurrentlimitedsourceandisinherentlyprotectedagainstshorts.Ifthesystemloadeverexceedstheoutputprogrammedcurrentthreshold,theoutputvoltagewilldropunlessthereissufficientcapacitanceorachargedbatterypresenttosupplementtheexcessiveload.AnexternalresistorisusedtoprogramtheVBUS_DPM.Theprogrammingresistor,RVDPMisdictatedbythefollowingequation:RVDPM=(VBUS_DPM–VBUS_DPMisthedesiredinputvoltageregulationvoltagethreshold;VBUS_DPM_1isthebuiltinoffsetthreshold,typically3.5VKVBUS_DPMisagainfactorfoundintheelectricalspecification,typically0.15V/kΩ.IfVDPMpinisshortedtoVSS,theVBUS_DPMissettotypically3.65V.IftheVDPMpinisfloated(opencircuit),theICoperatesinBatteryTrackingMode.Inthiscase,VBUSDPMthresholdisinternallysetasVTRK,whichistypicallyBAT+100mV(BAT>3.65V)or3.75V(BAT≤3.4V).IBATIBAT=BATBAT-3.6

V(BAT)V(BAT)=3.8V,IBAT=DeltaDelta- PRODUCTVBUS-Tracking- TA PRODUCTFigure10.VBUSTrackingvsBAT Figure11.TrackingDropoutVoltageTemperatureVBAT=3.8V,PRODUCTPRODUCTAnexternalresistorisusedtoprogramtheoutputcurrent(50to800mA)andcanbeusedasacurrentRISET=KISET÷IOUTisthedesiredfastchargecurrentinKISETisagainfactorfoundintheelectricalspecification,typically395TheISETresistorisshortprotectedandwilldetectalowerthanRISET_MAX.Thedetectionrequiresatleast80mAofoutputcurrent.Ifa"short"isdetected,thentheICwilllatchoffandcanonlyberesetbycyclingthepower.TheBATcurrentisinternallyclampedtoaumcurrentIOUT_CLwhichisindependentoftheISETshortdetectioncircuitry.Pre-ChargeandTheterminationandpre-chargecurrentareinternallysetat10%and20%offastchargecurrentI(BAT),respectively.Thepre-charge-to-fast-charge,Vlowvthresholdissetto3.0V.TheTSpinisdesignedtobecompatiblewiththeJEITAtemperaturestandardforLi-Ionbatteries.Therearefourthresholds,60°C,45°C,10°C,and0°C.Normaloperationoccursbetween10°Cand45°C.Ifbetween0°Cand10°C,thechargecurrentleveliscutinhalfandifbetween45°Cand60°C,theregulationvoltageisreducedtoFigure12.ChargeJEITAThevoltagebasedTSsensingisusedduetotheflexibilitytobecompatiblewithdifferentNTCs.VTSBisusedasthevoltagereferenceforTSsensing,andtwoexternalTSvoltagedivider(RT1andRTH)areusedtosetthetargetedtemperaturethreshold.Above60°Corbelow0°Cthechargeisdisabled.

LIMITEDPOWERCHARGEMODE VTSBCHARGESUSPENDEDREGULATIONREDUCTION TEMPERATURERANGEDURINGACHARGE 50%REDUCTIONCHARGECURRENT

CHARGE

Figure13.TSPin,ThermistorSenseAssuminga103ATNTCthermistoronthebatterypackasshowninFigure2,thevalueRT1canbedeterminedbyusingthefollowingequation(selectthemostcriticaltemperatureforthebestprecision):RT1=

RTH(45C)

PRODUCTPRODUCTFigure14.TSResistorTheTSpinhasanotheradditionalfeature.WhentheTSpinisdrivenhigh(VTS>VLP(TS)),theICoperatesinLimitedPowerChargemode.LimitedPowerChargeMode–TSPinWhentheTSpingoeshightotheLimitedPowerChargeMode(LPCM)threshold(VLP(TS)),thepartentersLimitedPowerChargemode.Thismodeisusednormallyforsolarchargingapplicationsorotherhighimpedanceinputsourcesthatdesiretomodifytheterminationroutineandothertimers.WhenenteringtheLimitedPowerChargingmode,thepre-chargetimerand10hoursafetytimerisheldinreset,andtheterminationroutineismodified.Abatterydetectroutineisruntoseeifthebatterywasremovedornot.IfthebatterywasremovedthentheCHGpinwillgotoitshighimpedancestateifnotalreadythere.Ifabatteryisdetected,thenormalchargeprocessbegins.Ifthenormalterminationconditionsaremet(Icharge<ITERM,BAT>VRCH)andVBUSDPMloopisnotactive,thechargingprocessterminates,andtheCHGpingoestoitshighimpedancestateifnotalreadythere.Whentheregulartimersaredisabledtherestillisa2hourtimerifthepartisstuckinDPMabove4.1Vbutoutsideofterminationconditionsatwhichpointchargingwillterminateandre-startifthevoltagefallsbelow4.1VWhencomingoutoftheLimitedPowerChargingmode,thebatterydetectroutineisrunandifabatteryisdetected,thenanewchargecyclebeginsandtheCHGLEDturnson.PRODUCTPRODUCTLimitedPowerChargemodeisnotnecessaryforallsolarcharging.AsolarpanelcharginginnormalmodewithoutTSpulledhighwouldkeepthenormalterminationtimersactiveandwouldallowtheTStemperaturemonitoringfunctionstobeuse.IfLimitedPowerChargingmodeisnotdesireduponremovalofthebatterywithathermistor,applyavoltageequalto30%VTSBonTSpinusingtwoexternalresistorstosetavoltagedivideranddisabletheTSmonitorThepre-chargetimerissetto30minutes.Thepre-chargecurrentisinternallysetto20%ofthefastchargeThefastchargetimerisfixedat10hoursandcanbeincreasedrealtimebygoingintothermalregulationorVBUS-DPM.WhileinthermalregulationorVBUS_DPM,thetimerclockslowsbyafactorof2,resultinginaclockthancountshalfasfastwhichwillincreasethetotaltime.Ifeitherthe30minuteortenhourtimertimesout,thechargingisterminatedandtheCHGpingoeshighimpedanceifnotalreadyinthatstate.ThetimerisresetbydisablingtheIC,cyclingpowerorgoingintoandoutofLPCM.OncetheBATpingoesaboveVRCH(reachesvoltageregulation),andthecurrenttapersdowntotheterminationthreshold,theCHGpingoeshighimpedanceandabatterydetectrouteisruntodetermineifthebatterywasremovedorthebatteryisfull.Ifthebatteryispresent,thechargecurrentwillterminate.Ifthebatterywasremovedalongwiththethermistor,thentheTSpinisdrivenhighandthechargerentersLPCM.IfthebatterywasremovedandtheTSpinisheldintheactiveregion,thenthebatterydetectroutinewillcontinueuntilabatteryisinserted.BatteryDetectThebatterydetectroutinechecksforamissingbatterywhilekeetheBATpinatauseablevoltage.WheneverthebatteryismissingtheCHGpinishighimpedance.ThebatterydetectroutineisrunwhenenteringandexitingLPCMtoverifyifbatteryispresent,orrunallthetimeifbatteryismissing.Onpower-up,ifbatteryvoltageisgreaterthanVRCHthreshold,abatterydetectroutineisruntodetermineifabatteryispresent.PRODUCTPRODUCTTimerTimerBatteryPresent TurnOffSinkCurrentReturntoStartBatteryStart25msTimerTimerSETVBATRegulationtoVREG400mVEnableSinkCurrentReset&Start25msVBAT>VVBAT>VO(BatteryPresent TurnOffSinkCurrentReturntoBatteryAbsentCHGFETOffTurnOffSinkCurrentReturntoFlowFigure15.BatteryDetectionFlowRefreshAftertermination,iftheBATpinvoltagedropstoVRCH(100mVbelowregulation)thenanewchargeisinitiated,buttheCHGpinremainsatahighimpedance(off).StartingaChargeonaFullTheterminationthresholdisraisedby14%,forthefirstminuteofachargecyclesoifafullbatteryisremovedandreinsertedoranewchargecycleisinitiated,thatthenewchargeterminates(lessthan1minute).BatteriesthathaverelaxedmanyhoursmaytakeseveralminutestotapertotheterminationthresholdandterminateLoadLoadModeisusedwhenthechargingsourceisremovedandanexternalaccessoryneedspowerfromthebattery.ThismodeisenteredbypullingtheMODEpintoHIlevel,andapassiveloadisdetectedatVBUSpin.TostarttheLoadMode,theminimumBATpinvoltageisBAT_REV_ST.WhenLoadModeisactive,theoscillatorandchargepumpwilloperateatreducedspeedtoreducequiescentcurrentprolongingbatterylife.DuringLoadMode,reversecurrentismonitored,andonceitrisestoaninternallysetthreshold,IREV_LIMIT,theloadcurrentregulationloopwilllimittheloadcurrenttothethresholdforablankingtimeoftREV_LIMIT_BLK.IftheoverloadconditioncontinuesaftertheblankingtimeoftREV_LIMIT_BLK,theloadcurrentlimitthresholdwillbereducedtoIREV_LIMIT_BK(about50mA)andLoadModecontinues,untiltheVBUSdropsbelowUVLOorotherfailureoccurs.