ILIMIT125xx.com

bq24105-Q1www.
ti.
comSLUS953A–AUGUST2009–REVISEDAPRIL2012SYNCHRONOUSSWITCHMODE,LI-IONANDLI-POLYMERCHARGE-MANAGEMENTICWITHINTEGRATEDPOWERFETs(bqSWITCHER)CheckforSamples:bq24105-Q11FEATURESDESCRIPTIONThebqSWITCHERseriesarehighlyintegratedLi-23QualifiedforAutomotiveApplicationsionandLi-polymerswitch-modechargemanagementIdealForHighlyEfficientChargerDesignsFordevicestargetedatawiderangeofportableSingle-,Two-,orThree-CellLi-IonandLi-applications.
ThebqSWITCHERseriesoffersPolymerBatteryPacksintegratedsynchronousPWMcontrollerandpowerFETs,high-accuracycurrentandvoltageregulation,AlsoforLiFePO4Battery(seeUsingbq24105chargepreconditioning,chargestatus,andchargetoChargeLiFePO4Battery)termination,inasmall,thermallyenhancedQFNIntegratedSynchronousFixed-Frequencypackage.
PWMControllerOperatingat1.
1MHzThebqSWITCHERchargesthebatteryinthreeWith0%to100%DutyCyclephases:conditioning,constantcurrent,andconstantIntegratedPowerFETsForUpTo2-AChargevoltage.
Chargeisterminatedbasedonuser-Rateselectableminimumcurrentlevel.
AprogrammableHigh-AccuracyVoltageandCurrentRegulationchargetimerprovidesasafetybackupforchargetermination.
ThebqSWITCHERautomaticallyrestartsStand-Alone(Built-InChargeManagementandthechargecycleifthebatteryvoltagefallsbelowanControl)Versioninternalthreshold.
ThebqSWITCHERautomaticallyStatusOutputsForLEDorHostProcessorenterssleepmodewhenVCCsupplyisremoved.
InterfaceIndicatesCharge-In-Progress,ChargeCompletion,Fault,andAC-AdapterPresentRHLPACKAGEConditions(TOPVIEW)20-VMaximumVoltageRatingonINandOUTPinsHigh-SideBatteryCurrentSensingBatteryTemperatureMonitoringAutomaticSleepModeforLowPowerConsumptionReverseLeakageProtectionPreventsBatteryDrainageThermalShutdownandProtectionBuilt-InBatteryDetectionAvailablein20-Pin,3.
5mm*4.
5mm,QFNPackage1Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
2bqSWITCHER,PowerPADaretrademarksofTexasInstruments.
3Allothertrademarksarethepropertyoftheirrespectiveowners.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright2009–2012,TexasInstrumentsIncorporatedProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.
Productionprocessingdoesnotnecessarilyincludetestingofallparameters.
bq24105-Q1SLUS953A–AUGUST2009–REVISEDAPRIL2012www.
ti.
comThisintegratedcircuitcanbedamagedbyESD.
TexasInstrumentsrecommendsthatallintegratedcircuitsbehandledwithappropriateprecautions.
Failuretoobserveproperhandlingandinstallationprocedurescancausedamage.
ESDdamagecanrangefromsubtleperformancedegradationtocompletedevicefailure.
Precisionintegratedcircuitsmaybemoresusceptibletodamagebecauseverysmallparametricchangescouldcausethedevicenottomeetitspublishedspecifications.
ORDERINGINFORMATION(1)TAPACKAGE(2)ORDERABLEPARTNUMBERTOP-SIDEMARKING–40°Cto85°CQFN–RHLReelof3000BQ24105IRHLRQ1BQ24105(1)Forthemostcurrentpackageandorderinginformation,seethePackageOptionAddendumattheendofthisdocument,orseetheTIwebsiteatwww.
ti.
com.
(2)Packagedrawings,thermaldata,andsymbolizationareavailableatwww.
ti.
com/packaging.
ABSOLUTEMAXIMUMRATINGS(1)overoperatingfree-airtemperaturerange(unlessotherwisenoted)Supplyvoltagerange(withrespecttoVSS)IN,VCC20VSTAT1,STAT2,PG,CE,SNS,BAT–0.
3Vto20VOUT–0.
7Vto20VInputvoltagerange(withrespecttoVSSandPGND)TS,TTC7VVTSB3.
6VISET1,ISET23.
3VVoltagedifferencebetweenSNSandBATinputs(VSNS–VBAT)±1VOutputsinkSTAT1,STAT2,PG10mAOutputcurrent(average)OUT2.
2ATAOperatingfree-airtemperaturerange–40°Cto85°CTJJunctiontemperaturerange–40°Cto125°CTstgStoragetemperature–65°Cto150°CLeadtemperature1,6mm(1/16inch)fromcasefor10seconds300°C(1)Stressesbeyondthoselistedunderabsolutemaximumratingsmaycausepermanentdamagetothedevice.
Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderrecommendedoperatingconditionsisnotimplied.
Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.
PACKAGEDISSIPATIONRATINGSTAVCC(min),PWMswitching10mAI(VCC)VCCsupplycurrentVCC>VCC(min),PWMNOTswitching5VCC>VCC(min),CE=HIGH315μA0°C≤TJ≤65°C,VI(BAT)=4.
2V,3.
5VCCV(SLP)butnotinchargeBatterydischargesleepcurrent,(SNS,0°C≤TJ≤65°C,VI(BAT)=8.
4V,I(SLP)5.
5μABAT,OUT,FBpins)VCCV(SLP)butnotincharge0°C≤TJ≤65°C,VI(BAT)=12.
6V,7.
7VCCV(SLP)butnotinchargeVoltageRegulationFeedbackregulationREFforbq24105VIBATIIBAT=25nAtypicalintopin2.
1V(W/FB)TA=25°C–0.
5%0.
5%Voltageregulationaccuracy–1%1%CurrentRegulation-FastChargeVLOWV≤VI(BAT)V(DO-MAX)100mV≤VIREG≤200mV,VIREGVoltageregulatedacrossR(SNS)Accuracy–10%10%ProgrammedWhere5k≤RSET1≤10k,SelectRSET1toprogramVIREG,VIREG(measured)=IOCHARGE+RSNS(–10%to10%excludeserrorsduetoRSET1andR(SNS)tolerances)V(LOWV)≤VI(BAT)≤VO(REG),V(ISET1)Outputcurrentsetvoltage1VV(VCC)≤VI(BAT)*V(DO-MAX)VLOWV≤VI(BAT)VRCH15200mAChargeterminationdetectionsetvoltage,VTERMVI(BAT)>VRCH100mVISET2K(ISET2)Terminationcurrentsetfactor1000V/AChargerterminationaccuracyVI(BAT)>VRCH–20%20%Bothrisingandfalling,tdg-TERMDeglitchtimeforchargetermination203040ms2-mVoverdrivetRISE,tFALL=100nsTemperatureComparatorandVTSBBiasRegulatorCopyright2009–2012,TexasInstrumentsIncorporated3bq24105-Q1SLUS953A–AUGUST2009–REVISEDAPRIL2012www.
ti.
comELECTRICALCHARACTERISTICS(continued)TJ=0°Cto125°Candrecommendedsupplyvoltagerange(unlessotherwisestated)PARAMETERTESTCONDITIONSMINTYPMAXUNIT%LTFColdtemperaturethreshold,TS,%ofbiasVLTF=VO(VTSB)*%LTF/10072.
8%73.
5%74.
2%%HTFHottemperaturethreshold,TS,%ofbiasVHTF=VO(VTSB)*%HTF/10033.
7%34.
4%35.
1%Cutofftemperaturethreshold,TS,%of%TCOVTCO=VO(VTSB)*%TCO/10028.
7%29.
3%29.
9%biasLTFhysteresis0.
5%1%1.
5%Bothrisingandfalling,tdg-TSDeglitchtimefortemperaturefault,TS203040ms2-mVoverdrivetRISE,tFALL=100nsVCC>VIN(min),VO(VTSB)TSbiasoutputvoltage3.
15VI(VTSB)=10mA0.
1μF≤CO(VTSB)≤1μFVCC>IN(min),VO(VTSB)TSbiasvoltageregulationaccuracy–10%10%I(VTSB)=10mA0.
1μF≤CO(VTSB)≤1μFBatteryRechargeThresholdVRCHRechargethresholdvoltageBelowVOREG75100125mV/cellVI(BAT)5VVOL(PG)Low-leveloutputsaturationvoltage,PGIO=10mA0.
1CEInputVILLow-levelinputvoltageIIL=5μA00.
4VVIHHigh-levelinputvoltageIIH=20μA1.
3VCCTTCInputtPRECHGPrechargetimer144018002160stCHARGEProgrammablechargetimerranget(CHG)=C(TTC)*K(TTC)25572minutesChargetimeraccuracy0.
01μF≤C(TTC)≤0.
18μF-10%10%KTTCTimermultiplier2.
6min/nFCTTCChargetimecapacitorrange0.
010.
22μFVTTC_ENTTCenablethresholdvoltageV(TTC)rising200mV4Copyright2009–2012,TexasInstrumentsIncorporatedbq24105-Q1www.
ti.
comSLUS953A–AUGUST2009–REVISEDAPRIL2012ELECTRICALCHARACTERISTICS(continued)TJ=0°Cto125°Candrecommendedsupplyvoltagerange(unlessotherwisestated)PARAMETERTESTCONDITIONSMINTYPMAXUNITSleepComparatorVCC≤VIBATVCC≤VIBAT2.
3V≤VI(OUT)≤VOREG,for1or2cells+5mV+75mVVSLP-ENTSleep-modeentrythresholdVVI(OUT)=12.
6V,RIN=1kVCC≤VIBATVCC≤VIBATbq24105/15(1)-4mV+73mVVSLP-EXITSleep-modeexithysteresis,2.
3V≤VI(OUT)≤VOREG40160mVVCCdecreasingbelowthreshold,tFALL=100ns,10-mVoverdrive,5μsPMOSturnsofftdg-SLPDeglitchtimeforsleepmodeVCCdecreasingbelowthreshold,tFALL=100ns,10-mVoverdrive,203040msSTATxpinsturnoffUVLOVUVLO-ONICactivethresholdvoltageVCCrising3.
153.
303.
50VICactivehysteresisVCCfalling120150mVPWM7V≤VCC≤VCC(max)400InternalP-channelMOSFETon-resistance4.
5V≤VCC≤7V500m7V≤VCC≤VCC(max)130InternalN-channelMOSFETon-resistance4.
5V≤VCC≤7V150fOSCOscillatorfrequency1.
1MHzFrequencyaccuracy–9%9%DMAXMaximumdutycycle100%DMINMinimumdutycycle0%tTODSwitchingdelaytime(turnon)20nstsyncminMinimumsynchronousFETontime60nsSynchronousFETminimumcurrent-off50400mAthreshold(2)BatteryDetectionBatterydetectioncurrentduringtime-outIDETECTVI(BAT)5sBeginsafterterminationdetected,IDISCHRG2Terminationdischargecurrent400μAVI(BAT)≤VOREGtDISCHRG2Terminationtime262msOutputCapacitorRequiredoutputceramiccapacitorrangeCOUTfromSNStoPGND,betweeninductorand4.
71047μFRSNSRequiredSNScapacitor(ceramic)atSNSCSNS0.
1μFpinProtectionThresholdoverVOREGtoturnoffP-channelVOVPOVPthresholdvoltageMOSFET,STAT1,andSTAT2duringcharge110117121%VO(REG)orterminationstatesILIMITCycle-by-cyclecurrentlimit2.
63.
64.
5AVSHORTShort-circuitvoltagethreshold,BATVI(BAT)falling1.
9522.
05V/cellISHORTShort-circuitcurrentVI(BAT)≤VSHORT3565mATSHTDWNThermaltrip165°CThermalhysteresis10°C(1)Forbq24105andbq24115only.
RINisconnectedbetweenINandPGNDpinsandneededtoensuresleepentry.
(2)N-channelalwaysturnsonfor~60nsandthenturnsoffifcurrentistoolow.
Copyright2009–2012,TexasInstrumentsIncorporated5bq24105-Q1SLUS953A–AUGUST2009–REVISEDAPRIL2012www.
ti.
comTERMINALFUNCTIONSTERMINALI/ODESCRIPTIONNAMENO.
Batteryvoltagesenseinput.
Bypassitwitha0.
1μFcapacitortoPGNDiftherearelonginductiveleadsBAT14Itobattery.
Chargerenableinput.
Thisactivelowinput,ifsethigh,suspendschargeandplacesthedeviceintheCE16Ilow-powersleepmode.
DonotpullupthisinputtoVTSB.
Outputvoltageanalogfeedbackadjustment.
ConnecttheoutputofaresistivevoltagedividerpoweredFB13Ifromthebatteryterminalstothisnodetoadjusttheoutputbatteryvoltageregulation.
IN3,4IChargerinputvoltage.
ISET18I/OChargercurrentsetpoint1(fastcharge).
Usearesistortogroundtosetthisvalue.
ISET29I/OChargecurrentsetpoint2(prechargeandtermination),setbyaresistorconnectedtoground.
Chargecurrentoutputinductorconnection.
ConnectazenerTVSdiodebetweenOUTpinandPGNDOUT1,20OpintoclampthevoltagespiketoprotectthepowerMOSFETsduringabnormalconditions.
Power-goodstatusoutput(opendrain).
ThetransistorturnsonwhenavalidVCCisdetected.
ItisturnedPG5Ooffinthesleepmode.
PGcanbeusedtodriveaLEDorcommunicatewithahostprocessor.
PGND17,18PowergroundinputChargecurrent-senseinput.
BatterycurrentissensedviathevoltagedropdevelopedonthispinbyanSNS15Iexternalsenseresistorinserieswiththebatterypack.
A0.
1-μFcapacitortoPGNDisrequired.
Chargestatus1(open-drainoutput).
Whenthetransistorturnsonindicateschargeinprocess.
WhenitSTAT12OisoffandwiththeconditionofSTAT2indicatesvariouschargerconditions(seeTable1).
Chargestatus2(open-drainoutput).
Whenthetransistorturnsonindicateschargeisdone.
WhenitisSTAT219OoffandwiththeconditionofSTAT1indicatesvariouschargerconditions(seeTable1).
Temperaturesenseinput.
ThisinputmonitorsitsvoltageagainstaninternalthresholdtodetermineifTS12Ichargingisallowed.
UseanNTCthermistorandavoltagedividerpoweredfromVTSBtodevelopthisvoltage(seeFigure6).
Timerandterminationcontrol.
ConnectacapacitorfromthisnodetoGNDtosetthebqSWITCHERTTC7Itimer.
Whenthisinputislow,thetimerandterminationdetectionaredisabled.
VCC6IAnalogdeviceinput.
A0.
1-μFcapacitortoVSSisrequired.
VSS10AnaloggroundinputTSinternalbiasregulatorvoltage.
Connectcapacitor(withavaluebetweena0.
1-μFand1-μF)betweenVTSB11OthisoutputandVSS.
ThereisaninternalelectricalconnectionbetweentheexposedthermalpadandVSS.
TheexposedExposedthermalpadmustbeconnectedtothesamepotentialastheVSSpinontheprintedcircuitboard.
ThePadThermalPadpowerpadcanbeusedasastargroundconnectionbetweenVSSandPGND.
Acommongroundplanemaybeused.
VSSpinmustbeconnectedtogroundatalltimes.
6Copyright2009–2012,TexasInstrumentsIncorporatedbq24105-Q1www.
ti.
comSLUS953A–AUGUST2009–REVISEDAPRIL2012TYPICALAPPLICATIONCIRCUITFigure1.
Stand-Alone2-CellApplicationCopyright2009–2012,TexasInstrumentsIncorporated7bq24105-Q1SLUS953A–AUGUST2009–REVISEDAPRIL2012www.
ti.
comTYPICALOPERATINGPERFORMANCEEFFICIENCYvsCHARGECURRENTFigure2.
EFFICIENCYvsCHARGECURRENTFigure3.
8Copyright2009–2012,TexasInstrumentsIncorporatedbq24105-Q1www.
ti.
comSLUS953A–AUGUST2009–REVISEDAPRIL2012FUNCTIONALBLOCKDIAGRAMCopyright2009–2012,TexasInstrumentsIncorporated9bq24105-Q1SLUS953A–AUGUST2009–REVISEDAPRIL2012www.
ti.
comOPERATIONALFLOWCHARTFigure4.
Stand-AloneVersionOperationalFlowChart10Copyright2009–2012,TexasInstrumentsIncorporatedbq24105-Q1www.
ti.
comSLUS953A–AUGUST2009–REVISEDAPRIL2012DETAILEDDESCRIPTIONThebqSWITCHERsupportsaprecisionLi-ionorLi-polymerchargingsystemforone-,two-,orthree-cellapplications.
SeeFigure4foratypicalchargeprofile.
Figure5.
TypicalChargingProfilePWMControllerThebq24105providesanintegratedfixed1MHzfrequencyvoltage-modecontrollerwithFeed-Forwardfunctiontoregulatechargecurrentorvoltage.
Thistypeofcontrollerisusedtohelpimprovelinetransientresponse,therebysimplifyingthecompensationnetworkusedforbothcontinuousanddiscontinuouscurrentconductionoperation.
ThevoltageandcurrentloopsareinternallycompensatedusingaType-IIIcompensationschemethatprovidesenoughphaseboostforstableoperation,allowingtheuseofsmallceramiccapacitorswithverylowESR.
Thereisa0.
5-VoffsetonthebottomofthePWMramptoallowthedevicetooperatebetween0%to100%dutycycle.
TheinternalPWMgatedrivecandirectlycontroltheinternalPMOSandNMOSpowerMOSFETs.
Thehigh-sidegatevoltageswingsfromVCC(whenoff),toVCC–6(whenonandVCCisgreaterthan6V)tohelpreducetheconductionlossesoftheconverterbyenhancingthegateanextravoltbeyondthestandard5V.
Thelow-sidegatevoltageswingsfrom6V,toturnontheNMOS,downtoPGNDtoturnitoff.
Thebq24105hastwobacktobackcommon-drainP-MOSFETsonthehighside.
AninputP-MOSFETpreventsbatterydischargewhenINislowerthanBAT.
ThesecondP-MOSFETbehavesastheswitchingcontrolFET,eliminatingtheneedofabootstrapcapacitor.
Cycle-by-cyclecurrentlimitissensedthroughtheinternalhigh-sidesenseFET.
Thethresholdissettoanominal3.
6Apeakcurrent.
Thelow-sideFETalsohasacurrentlimitthatdecidesifthePWMControllerwilloperateinsynchronousornon-synchronousmode.
Thisthresholdissetto100mAanditturnsoffthelow-sideNMOSbeforethecurrentreverses,preventingthebatteryfromdischarging.
Synchronousoperationisusedwhenthecurrentofthelow-sideFETisgreaterthan100mAtominimizepowerlosses.
Copyright2009–2012,TexasInstrumentsIncorporated11bq24105-Q1SLUS953A–AUGUST2009–REVISEDAPRIL2012www.
ti.
comTemperatureQualificationThebqSWITCHERcontinuouslymonitorsbatterytemperaturebymeasuringthevoltagebetweentheTSpinandVSSpin.
Anegativetemperaturecoefficientthermistor(NTC)andanexternalvoltagedividertypicallydevelopthisvoltage.
ThebqSWITCHERcomparesthisvoltageagainstitsinternalthresholdstodetermineifchargingisallowed.
Toinitiateachargecycle,thebatterytemperaturemustbewithintheV(LTF)-to-V(HTF)thresholds.
Ifbatterytemperatureisoutsideofthisrange,thebqSWITCHERsuspendschargeandwaitsuntilthebatterytemperatureiswithintheV(LTF)-to-V(HTF)range.
Duringthechargecycle(bothprechargeandfastcharge),thebatterytemperaturemustbewithintheV(LTF)-to-V(TCO)thresholds.
Ifbatterytemperatureisoutsideofthisrange,thebqSWITCHERsuspendschargeandwaitsuntilthebatterytemperatureiswithintheV(LTF)-to-V(HTF)range.
ThebqSWITCHERsuspendschargebyturningoffthePWMandholdingthetimervalue(i.
e.
,timersarenotresetduringasuspendcondition).
NotethatthebiasfortheexternalresistordividerisprovidedfromtheVTSBoutput.
ApplyingaconstantvoltagebetweentheV(LTF)-to-V(HTF)thresholdstotheTSpindisablesthetemperature-sensingfeature.
(1)Figure6.
TSPinThresholdsBatteryPreconditioning(Precharge)Onpowerup,ifthebatteryvoltageisbelowtheVLOWVthreshold,thebqSWITCHERappliesaprechargecurrent,IPRECHG,tothebattery.
Thisfeaturerevivesdeeplydischargedcells.
ThebqSWITCHERactivatesasafetytimer,tPRECHG,duringtheconditioningphase.
IftheVLOWVthresholdisnotreachedwithinthetimerperiod,thebqSWITCHERturnsoffthechargerandenunciatesFAULTontheSTATxpins.
InthecaseofaFAULTcondition,thebqSWITCHERreducesthecurrenttoIDETECT.
IDETECTisusedtodetectabatteryreplacementcondition.
FaultconditionisclearedbyPORorbatteryreplacement.
12Copyright2009–2012,TexasInstrumentsIncorporatedbq24105-Q1www.
ti.
comSLUS953A–AUGUST2009–REVISEDAPRIL2012Themagnitudeoftheprechargecurrent,IO(PRECHG),isdeterminedbythevalueofprogrammingresistor,R(ISET2),connectedtotheISET2pin.
(2)whereRSNSistheexternalcurrent-senseresistorV(ISET2)istheoutputvoltageoftheISET2pinK(ISET2)istheV/AgainfactorV(ISET2)andK(ISET2)arespecifiedintheElectricalCharacteristicstable.
BatteryChargeCurrentThebatterychargecurrent,IO(CHARGE),isestablishedbysettingtheexternalsenseresistor,R(SNS),andtheresistor,R(ISET1),connectedtotheISET1pin.
Inordertosetthecurrent,firstchooseR(SNS)basedontheregulationthresholdVIREGacrossthisresistor.
ThebestaccuracyisachievedwhentheVIREGisbetween100mVand200mV.
(3)Iftheresultsisnotastandardsenseresistorvalue,choosethenextlargervalue.
Usingtheselectedstandardvalue,solveforVIREG.
Oncethesenseresistorisselected,theISET1resistorcanbecalculatedusingthefollowingequation:(4)BatteryVoltageRegulationThevoltageregulationfeedbackoccursthroughtheBATpin.
Thisinputistieddirectlytothepositivesideofthebatterypack.
ThebqSWITCHERmonitorsthebattery-packvoltagebetweentheBATandVSSpins.
Outputregulationvoltageisspecifiedas:(5)whereR1andR2areresistordividerfromBATtoFBandFBtoVSS,respectively.
Rechargethresholdvoltageisspecifiedas:(6)Copyright2009–2012,TexasInstrumentsIncorporated13bq24105-Q1SLUS953A–AUGUST2009–REVISEDAPRIL2012www.
ti.
comChargeTerminationandRechargeThebqSWITCHERmonitorsthechargingcurrentduringthevoltageregulationphase.
Oncetheterminationthreshold,ITERM,isdetected,thebqSWITCHERterminatescharge.
Theterminationcurrentlevelisselectedbythevalueofprogrammingresistor,R(ISET2),connectedtotheISET2pin.
(7)whereR(SNS)istheexternalcurrent-senseresistorVTERMistheoutputoftheISET2pinK(ISET2)istheA/VgainfactorVTERMandK(ISET2)arespecifiedintheElectricalCharacteristicstableAsasafetybackup,thebqSWITCHERalsoprovidesaprogrammablechargetimer.
ThechargetimeisprogrammedbythevalueofacapacitorconnectedbetweentheTTCpinandGNDbythefollowingformula:(8)whereC(TTC)isthecapacitorconnectedtotheTTCpinK(TTC)isthemultiplierAnewchargecycleisinitiatedwhenoneofthefollowingconditionsisdetected:ThebatteryvoltagefallsbelowtheVRCHthreshold.
Power-onreset(POR),ifbatteryvoltageisbelowtheVRCHthresholdCEtoggleTTCpin,describedasfollows.
Inordertodisablethechargeterminationandsafetytimer,theusercanpulltheTTCinputbelowtheVTTC_ENthreshold.
Goingabovethisthresholdenablestheterminationandsafetytimerfeaturesandalsoresetsthetimer.
TyingTTChighdisablesthesafetytimeronly.
14Copyright2009–2012,TexasInstrumentsIncorporatedbq24105-Q1www.
ti.
comSLUS953A–AUGUST2009–REVISEDAPRIL2012SleepModeThebqSWITCHERentersthelow-powersleepmodeiftheVCCpinisremovedfromthecircuit.
ThisfeaturepreventsdrainingthebatteryduringtheabsenceofVCC.
ChargeStatusOutputsTheopen-drainSTAT1andSTAT2outputsindicatevariouschargeroperationsasshowninTable1.
ThesestatuspinscanbeusedtodriveLEDsorcommunicatetothehostprocessor.
NotethatOFFindicatesthattheopen-draintransistoristurnedoff.
Table1.
StatusPinsSummaryChargeStateSTAT1STAT2Charge-in-progressONOFFChargecompleteOFFONChargesuspend,timerfault,overvoltage,sleepmode,batteryabsentOFFOFFTable2.
StatusPinsSummaryChargeStateSTAT1STAT2BatteryabsentOFFOFFCharge-in-progressONOFFChargecompleteOFFONBatteryoverdischarge,VI(BAT)5Hz)OFFChargesuspend(duetoTSpinandinternalthermalprotection)ON/OFF(0.
5Hz)OFFPrechargetimerfaultON/OFF(0.
5Hz)OFFFastchargetimerfaultON/OFF(0.
5Hz)OFFSleepmodeOFFOFFPGOutputTheopen-drainPG(powergood)indicateswhentheAC-to-DCadapter(i.
e.
,VCC)ispresent.
Theoutputturnsonwhensleep-modeexitthreshold,VSLP-EXIT,isdetected.
Thisoutputisturnedoffinthesleepmode.
ThePGpincanbeusedtodriveanLEDorcommunicatetothehostprocessor.
CEInput(ChargeEnable)TheCEdigitalinputisusedtodisableorenablethechargeprocess.
Alow-levelsignalonthispinenablesthechargeandahigh-levelVCCsignaldisablesthecharge.
Ahigh-to-lowtransitiononthispinalsoresetsalltimersandfaultconditions.
NotethattheCEpincannotbepulleduptoVTSBvoltage.
Thismaycreatepower-upissues.
Copyright2009–2012,TexasInstrumentsIncorporated15bq24105-Q1SLUS953A–AUGUST2009–REVISEDAPRIL2012www.
ti.
comTimerFaultRecoveryAsshowninFigure6,bqSWITCHERprovidesarecoverymethodtodealwithtimerfaultconditions.
Thefollowingsummarizesthismethod.
Condition1VI(BAT)aboverechargethreshold(VOREG-VRCH)andtimeoutfaultoccurs.
Recoverymethod:bqSWITCHERwaitsforthebatteryvoltagetofallbelowtherechargethreshold.
Thiscouldhappenasaresultofaloadonthebattery,self-dischargeorbatteryremoval.
Oncethebatteryfallsbelowtherechargethreshold,thebqSWITCHERclearsthefaultandentersthebatteryabsentdetectionroutine.
APORorCEtogglealsoclearsthefault.
Condition2Chargevoltagebelowrechargethreshold(VOREG–VRCH)andtimeoutfaultoccursRecoverymethod:Underthisscenario,thebqSWITCHERappliestheIDETECTcurrent.
Thissmallcurrentisusedtodetectabatteryremovalconditionandremainsonaslongasthebatteryvoltagestaysbelowtherechargethreshold.
Ifthebatteryvoltagegoesabovetherechargethreshold,thenthebqSWITCHERdisablestheIDETECTcurrentandexecutestherecoverymethoddescribedinCondition1.
Oncethebatteryfallsbelowtherechargethreshold,thebqSWITCHERclearsthefaultandentersthebatteryabsentdetectionroutine.
APORorCEtogglealsoclearsthefault.
OutputOvervoltageProtectionThebqSWITCHERprovidesabuilt-inovervoltageprotectiontoprotectthedeviceandothercomponentsagainstdamagesifthebatteryvoltagegetstoohigh,aswhenthebatteryissuddenlyremoved.
Whenanovervoltageconditionisdetected,thisfeatureturnsoffthePWMandSTATxpins.
ThefaultisclearedonceVIBATdropstotherechargethreshold(VOREG–VRCH).
Inductor,Capacitor,andSenseResistorSelectionGuidelinesThebqSWITCHERprovidesinternalloopcompensation.
Withthisscheme,beststabilityoccurswhenLCresonantfrequency,foisapproximately16kHz(8kHzto32kHz).
Equation9canbeusedtocalculatethevalueoftheoutputinductorandcapacitor.
Table3providesasummaryoftypicalcomponentvaluesforvariouschargerates.
(9)Table3.
OutputComponentsSummaryCHARGECURRENT0.
5A1A2AOutputinductor,LOUT22μH10μH4.
7μHOutputcapacitor,COUT4.
7μF10μF22μF(or2*10μF)ceramicSenseresistor,R(SNS)0.
20.
10.
0516Copyright2009–2012,TexasInstrumentsIncorporatedbq24105-Q1www.
ti.
comSLUS953A–AUGUST2009–REVISEDAPRIL2012BatteryDetectionForapplicationswithremovablebatterypacks,bqSWITCHERprovidesabatteryabsentdetectionschemetoreliablydetectinsertionand/orremovalofbatterypacks.
Figure7.
BatteryAbsentDetectionThevoltageattheBATpinisheldabovethebatteryrechargethreshold,VOREG–VRCH,bythechargedbatteryfollowingfastcharging.
WhenthevoltageattheBATpinfallstotherechargethreshold,eitherbyaloadonthebatteryorduetobatteryremoval,thebqSWITCHERbeginsabatteryabsentdetectiontest.
Thistestinvolvesenablingadetectioncurrent,IDISCHARGE1,foraperiodoftDISCHARGE1andcheckingtoseeifthebatteryvoltageisbelowtheshortcircuitthreshold,VSHORT.
Followingthis,thewakecurrent,IWAKEisappliedforaperiodoftWAKEandthebatteryvoltageischeckedagaintoensurethatitisabovetherechargethreshold.
Thepurposeofthiscurrentistoattempttocloseanopenbatterypackprotector,ifoneisconnectedtothebqSWITCHER.
PassingbothofthedischargeandchargetestsindicatesabatteryabsentfaultattheSTATpins.
Failureofeitherteststartsanewchargecycle.
Fortheabsentbatterycondition,typicallythevoltageontheBATpinrisesandfallsbetween0VandVOVPthresholdsindefinitely.
Copyright2009–2012,TexasInstrumentsIncorporated17bq24105-Q1SLUS953A–AUGUST2009–REVISEDAPRIL2012www.
ti.
comFigure8.
BatteryDetectTimingDiagramBatteryDetectionExampleInordertodetectanobatteryconditionduringthedischargeandwaketests,themaximumoutputcapacitanceshouldnotexceedthefollowing:a.
Discharge(IDISCHRG1=400μA,tDISCHRG1=1s,VSHORT=2V)(10)b.
Wake(IWAKE=2mA,tWAKE=0.
5s,VOREG–VRCH=4.
1V)(11)Basedonthesecalculationstherecommendedmaximumoutputcapacitancetoensureproperoperationofthebatterydetectionschemeis100μFwhichwillallowforprocessandtemperaturevariations.
Figure9showsthebatterydetectionschemewhenabatteryisinserted.
Channel3istheoutputsignalandChannel4istheoutputcurrent.
TheoutputsignalswitchesbetweenVOREGandGNDuntilabatteryisinserted.
Oncethebatteryisdetected,theoutputcurrentincreasesfrom0Ato1.
3A,whichistheprogrammedchargecurrentforthisapplication.
18Copyright2009–2012,TexasInstrumentsIncorporatedbq24105-Q1www.
ti.
comSLUS953A–AUGUST2009–REVISEDAPRIL2012Figure9.
BatteryDetectionWaveformWhenaBatteryisInsertedFigure10showsthebatterydetectionschemewhenabatteryisremoved.
Channel3istheoutputsignalandChannel4istheoutputcurrent.
Whenthebatteryisremoved,theoutputsignalgoesupduetothestoredenergyintheinductoranditcrossestheVOREG–VRCHthreshold.
Atthispointtheoutputcurrentgoesto0AandtheICterminatesthechargeprocessandturnsontheIDISCHG2fortDISCHG2.
ThiscausestheoutputvoltagetofalldownbelowtheVOREG–VRCHGthresholdtriggeringaBatteryAbsentconditionandstartingthebatterydetectionscheme.
Figure10.
BatteryDetectionWaveformWhenaBatteryisRemovedCopyright2009–2012,TexasInstrumentsIncorporated19bq24105-Q1SLUS953A–AUGUST2009–REVISEDAPRIL2012www.
ti.
comCurrentSenseAmplifierAcurrentsenseamplifierfeaturethattranslatesthechargecurrentintoaDCvoltageisoffered.
Figure11isablockdiagramofthisfeature.
Figure11.
CurrentSenseAmplifierThevoltageontheISET2pincanbeusedtocalculatethechargecurrent.
Equation12showstherelationshipbetweentheISET2voltageandthechargecurrent:(12)Thisfeaturecanbeusedtomonitorthechargecurrent(Figure12)duringthecurrentregulationphase(Fastchargeonly)andthevoltageregulationphase.
TheschematicfortheapplicationcircuitforthiswaveformisshowninFigure14Figure12.
CurrentSenseAmplifierChargeCurrentWaveform20Copyright2009–2012,TexasInstrumentsIncorporatedbq24105-Q1www.
ti.
comSLUS953A–AUGUST2009–REVISEDAPRIL2012bqSWITCHERSYSTEMDESIGNEXAMPLEThefollowingsectionprovidesadetailedsystemdesignexampleforthebq24100.
SystemDesignSpecifications:VIN=16VVBAT=4.
2V(1-Cell)ICHARGE=1.
33AIPRECHARGE=ITERM=133mASafetyTimer=5hoursInductorRippleCurrent=30%ofFastChargeCurrentInitiateChargeTemperature=0°Cto45°C1.
Determinetheinductorvalue(LOUT)forthespecifiedchargecurrentripple:(13)Settheoutputinductortostandard10μH.
Calculatethetotalripplecurrentwithusingthe10μHinductor:(14)Calculatethemaximumoutputcurrent(peakcurrent):(15)Usestandard10μHinductorwithasaturationcurrenthigherthan1.
471A.
(i.
e.
,SumidaCDRH74-100)Copyright2009–2012,TexasInstrumentsIncorporated21bq24105-Q1SLUS953A–AUGUST2009–REVISEDAPRIL2012www.
ti.
com2.
Determinetheoutputcapacitorvalue(OUT)using16kHzastheresonantfrequency:(16)Usestandardvalue10μF,25V,X5R,±20%ceramiccapacitor(i.
e.
,Panasonic1206ECJ-3YB1E106M3.
Determinethesenseresistorusingthefollowingequation:(17)Inordertogetbettercurrentregulationaccuracy(±10%),letVRSNSbebetween100mVand200mV.
UseVRSNS=100mVandcalculatethevalueforthesenseresistor.
(18)Thisvalueisnotstandardinresistors.
Ifthishappens,thenchoosethenextlargervaluewhichinthiscaseis0.
1.
Usingthesameequation(15)theactualVRSNSwillbe133mV.
Calculatethepowerdissipationonthesenseresistor:(19)Selectstandardvalue100m,0.
25W0805,1206or2010size,highprecisionsensingresistor.
(i.
e.
,VishayCRCW1210-0R10F)4.
DetermineISET1resistorusingthefollowingequation:(20)Selectstandardvalue7.
5k,1/16W±1%resistor(i.
e.
,VishayCRCWD0603-7501-F)5.
DetermineISET2resistorusingthefollowingequation:(21)Selectstandardvalue7.
5k,1/16W±1%resistor(i.
e.
,VishayCRCWD0603-7501-F)22Copyright2009–2012,TexasInstrumentsIncorporatedbq24105-Q1www.
ti.
comSLUS953A–AUGUST2009–REVISEDAPRIL20126.
DetermineTTCcapacitor(TTC)forthe5.
0hourssafetytimerusingthefollowingequation:(22)Selectstandardvalue100nF,16V,X7R,±10%ceramiccapacitor(i.
e.
,PanasonicECJ-1VB1C104K).
Usingthiscapacitortheactualsafetytimerwillbe4.
3hours.
7.
DetermineTSresistornetworkforanoperatingtemperaturerangefrom0°Cto45°C.
Figure13.
TSResistorNetworkAssuminga103ATNTCThermistoronthebatterypack,determinethevaluesforRT1andRT2usingthefollowingequations:(23)(24)Copyright2009–2012,TexasInstrumentsIncorporated23bq24105-Q1SLUS953A–AUGUST2009–REVISEDAPRIL2012www.
ti.
comAPPLICATIONINFORMATIONChargingBatteryandPoweringSystemWithoutAffectingBatteryChargeandTerminationFigure14.
ApplicationCircuitforChargingaBatteryandPoweringaSystemWithoutAffectingTerminationThebqSWITCHERwasdesignedasastand-alonebatterychargerbutcanbeeasilyadaptedtopowerasystemload,whileconsideringafewminorissues.
Advantages:1.
Thechargercontrollerisbasedonlyonwhatcurrentgoesthroughthecurrent-senseresistor(soprecharge,constantcurrent,andterminationallworkwell),andisnotaffectedbythesystemload.
2.
Theinputvoltagehasbeenconvertedtoausablesystemvoltagewithgoodefficiencyfromtheinput.
3.
ExtraexternalFETsarenotneededtoswitchpowersourcetothebattery.
4.
TheTTCpincanbegroundedtodisableterminationandkeeptheconverterrunningandthebatteryfullycharged,orlettheswitcherterminatewhenthebatteryisfullandthenrunoffofthebatteryviathesenseresistor.
OtherIssues:1.
Ifthesystemloadcurrentislarge(≥1A),theIRdropacrossthebatteryimpedancecausesthebatteryvoltagetodropbelowtherefreshthresholdandstartanewcharge.
Thechargerwouldthenterminateduetolowchargecurrent.
Therefore,thechargerwouldcyclebetweenchargingandtermination.
Iftheloadissmaller,thebatterywouldhavetodischargedowntotherefreshthresholdresultinginamuchslowercycling.
NotethatgroundingtheTTCpinkeepstheconverteroncontinuously.
2.
IfTTCisgrounded,thebatteryiskeptat4.
2V(notmuchdifferentthanleavingafullychargedbatterysetunloaded).
3.
Efficiencydeclines2-3%hitwhendischargingthroughthesenseresistortothesystem.
24Copyright2009–2012,TexasInstrumentsIncorporatedbq24105-Q1www.
ti.
comSLUS953A–AUGUST2009–REVISEDAPRIL2012Usingbq24105toChargeLiFePO4BatteryTheLiFePO4batteryhasmanyuniquefeaturessuchasahighthermalrunawaytemperature,dischargecurrentcapability,andchargecurrent.
Thesespecialfeaturesmakeitattractiveinmanyapplicationssuchaspowertools.
Therecommendedchargevoltageis3.
6Vandterminationcurrentis50mA.
Figure15showsanapplicationcircuitforchargingonecellLiFePO4usingbq24105.
Thechargevoltageis3.
6Vandrechargevoltageis3.
516V.
Thefastchargingcurrentissetto1.
33Awhiletheterminationcurrentis50mA.
Thiscircuitcanbeeasilychangedtosupporttwoorthreecellapplications.
However,only84mVdifferencebetweenregulationsetpointandrechargeablethresholdmakesitfrequentlyenterintorechargemodewhensmallloadcurrentisapplied.
Thiscanbesolvedbylowerdowntherechargevoltagethresholdto200mVtodischargemoreenergyfromthebatterybeforeitentersrechargemodeagain.
Seetheapplicationreport,Usingthebq24105/25toChargeLiFePO4Battery(SLUA443),foradditionaldetails.
Therechargethresholdshouldbeselectedaccordingtorealapplicationconditions.
Figure15.
1-CellLiFePO4ApplicationCopyright2009–2012,TexasInstrumentsIncorporated25bq24105-Q1SLUS953A–AUGUST2009–REVISEDAPRIL2012www.
ti.
comTHERMALCONSIDERATIONSTheSWITCHERispackagedinathermallyenhancedMLPpackage.
ThepackageincludesathermalpadtoprovideaneffectivethermalcontactbetweentheICandtheprintedcircuitboard(PCB).
FullPCBdesignguidelinesforthispackageareprovidedintheapplicationreportentitled:QFN/SONPCBAttachment(SLUA271).
Themostcommonmeasureofpackagethermalperformanceisthermalimpedance(θJA)measured(ormodeled)fromthechipjunctiontotheairsurroundingthepackagesurface(ambient).
ThemathematicalexpressionforθJAis:(25)Where:TJ=chipjunctiontemperatureTA=ambienttemperatureP=devicepowerdissipationFactorsthatcangreatlyinfluencethemeasurementandcalculationofθJAinclude:WhetherornotthedeviceisboardmountedTracesize,composition,thickness,andgeometryOrientationofthedevice(horizontalorvertical)VolumeoftheambientairsurroundingthedeviceundertestandairflowWhetherothersurfacesareincloseproximitytothedevicebeingtestedThedevicepowerdissipation,P,isafunctionofthechargerateandthevoltagedropacrosstheinternalpowerFET.
Itcanbecalculatedfromthefollowingequation:P=[Vin*lin-Vbat*Ibat]DuetothechargeprofileofLi-xxbatteries,themaximumpowerdissipationistypicallyseenatthebeginningofthechargecyclewhenthebatteryvoltageisatitslowest.
(SeeFigure5.
)26Copyright2009–2012,TexasInstrumentsIncorporatedbq24105-Q1www.
ti.
comSLUS953A–AUGUST2009–REVISEDAPRIL2012PCBLAYOUTCONSIDERATIONItisimportanttopayspecialattentiontothePCBlayout.
Thefollowingprovidessomeguidelines:Toobtainoptimalperformance,thepowerinputcapacitors,connectedfrominputtoPGND,shouldbeplacedascloseaspossibletothebqSWITCHER.
TheoutputinductorshouldbeplaceddirectlyabovetheICandtheoutputcapacitorconnectedbetweentheinductorandPGNDoftheIC.
TheintentistominimizethecurrentpathloopareafromtheOUTpinthroughtheLCfilterandbacktotheGNDpin.
Thesenseresistorshouldbeadjacenttothejunctionoftheinductorandoutputcapacitor.
RoutethesenseleadsconnectedacrosstheR(SNS)backtotheIC,closetoeachother(minimizelooparea)orontopofeachotheronadjacentlayers(donotroutethesenseleadsthroughahigh-currentpath).
Useanoptionalcapacitordownstreamfromthesenseresistoriflong(inductive)batteryleadsareused.
Placeallsmall-signalcomponents(CTTC,RSET1/2andTS)closetotheirrespectiveICpin(donotplacecomponentssuchthatroutinginterruptspowerstagecurrents).
Allsmallcontrolsignalsshouldberoutedawayfromthehighcurrentpaths.
ThePCBshouldhaveagroundplane(return)connecteddirectlytothereturnofallcomponentsthroughvias(threeviaspercapacitorforpower-stagecapacitors,threeviasfortheICPGND,oneviapercapacitorforsmall-signalcomponents).
Astargrounddesignapproachistypicallyusedtokeepcircuitblockcurrentsisolated(high-power/low-powersmall-signal)whichreducesnoise-couplingandground-bounceissues.
Asinglegroundplaneforthisdesigngivesgoodresults.
Withthissmalllayoutandasinglegroundplane,thereisnotaground-bounceissue,andhavingthecomponentssegregatedminimizescouplingbetweensignals.
Thehigh-currentchargepathsintoINandfromtheOUTpinsmustbesizedappropriatelyforthemaximumchargecurrentinordertoavoidvoltagedropsinthesetraces.
ThePGNDpinsshouldbeconnectedtothegroundplanetoreturncurrentthroughtheinternallow-sideFET.
ThethermalviasintheICPowerPADprovidethereturn-pathconnection.
ThebqSWITCHERispackagedinathermallyenhancedMLPpackage.
ThepackageincludesathermalpadtoprovideaneffectivethermalcontactbetweentheICandthePCB.
FullPCBdesignguidelinesforthispackageareprovidedintheapplicationreportentitled:QFN/SONPCBAttachment(SLUA271).
Six10-milto13-milviasareaminimumnumberofrecommendedvias,placedintheIC'spowerpad,connectingittoagroundthermalplaneontheoppositesideofthePWB.
ThisplanemustbeatthesamepotentialasVSSandPGNDofthisIC.
SeeuserguideSLUU200foranexampleofgoodlayout.
WAVEFORMS:AllwaveformsaretakenatLout(ICOutpin).
VIN=7.
6Vandthebatterywassetto2.
6V,3.
5V,and4.
2Vforthethreewaveforms.
Whenthetopswitchoftheconverterison,thewaveformisat~7.
5V,andwhenoff,thewaveformisnearground.
Notethattheringingontheswitchingedgesissmall.
Thisisduetoatightlayout(minimizedloopareas),ashieldedinductor(closedcore),andusingalow-inductivescopegroundlead(i.
e.
,shortwithminimumloop).
Copyright2009–2012,TexasInstrumentsIncorporated27bq24105-Q1SLUS953A–AUGUST2009–REVISEDAPRIL2012www.
ti.
comPrecharge:Thecurrentislowinprecharge;so,thebottomsynchronousFETturnsoffafteritsminimumon-timewhichexplainsthestepbetween0Vand-0.
5V.
WhenthebottomFETandtopFETareoff,thecurrentconductsthroughthebodydiodeofthebottomFETwhichresultsinadiodedropbelowthegroundpotential.
TheinitialnegativespikeisthedelayturningonthebottomFET,whichistopreventshoot-throughcurrentasthetopFETisturningoff.
FastCharge:Thisiscapturedduringtheconstant-currentphase.
ThetwonegativespikesaretheresultoftheshortdelaywhenswitchingbetweenthetopandbottomFETs.
Thebreak-before-makeactionpreventscurrentshoot-throughandresultsinabodydiodedropbelowgroundpotentialduringthebreaktime.
ChargeduringVoltageRegulationandApproachingTermination:Notethatthiswaveformissimilartotheprechargewaveform.
Thedifferenceisthatthebatteryvoltageishighersothedutycycleisslightlyhigher.
ThebottomFETstaysonlongerbecausethereismoreofacurrentloadthanduringprecharge;ittakeslongerfortheinductorcurrenttorampdowntothecurrentthresholdwherethesynchronousFETisdisabled.
28Copyright2009–2012,TexasInstrumentsIncorporatedbq24105-Q1www.
ti.
comSLUS953A–AUGUST2009–REVISEDAPRIL2012REVISIONHISTORYChangesfromOriginal(August,2009)toRevisionAPageUpdatedVOREGformulatomatchtheBQ24105commercialdatasheet.
13Copyright2009–2012,TexasInstrumentsIncorporated29PACKAGEOPTIONADDENDUMwww.
ti.
com10-Dec-2020Addendum-Page1PACKAGINGINFORMATIONOrderableDeviceStatus(1)PackageTypePackageDrawingPinsPackageQtyEcoPlan(2)Leadfinish/Ballmaterial(6)MSLPeakTemp(3)OpTemp(°C)DeviceMarking(4/5)SamplesBQ24105IRHLRQ1ACTIVEVQFNRHL203000RoHS&GreenNIPDAULevel-3-260C-168HR-40to85BQ24105(1)Themarketingstatusvaluesaredefinedasfollows:ACTIVE:Productdevicerecommendedfornewdesigns.
LIFEBUY:TIhasannouncedthatthedevicewillbediscontinued,andalifetime-buyperiodisineffect.
NRND:Notrecommendedfornewdesigns.
Deviceisinproductiontosupportexistingcustomers,butTIdoesnotrecommendusingthispartinanewdesign.
PREVIEW:Devicehasbeenannouncedbutisnotinproduction.
Samplesmayormaynotbeavailable.
OBSOLETE:TIhasdiscontinuedtheproductionofthedevice.
(2)RoHS:TIdefines"RoHS"tomeansemiconductorproductsthatarecompliantwiththecurrentEURoHSrequirementsforall10RoHSsubstances,includingtherequirementthatRoHSsubstancedonotexceed0.
1%byweightinhomogeneousmaterials.
Wheredesignedtobesolderedathightemperatures,"RoHS"productsaresuitableforuseinspecifiedlead-freeprocesses.
TImayreferencethesetypesofproductsas"Pb-Free".
RoHSExempt:TIdefines"RoHSExempt"tomeanproductsthatcontainleadbutarecompliantwithEURoHSpursuanttoaspecificEURoHSexemption.
Green:TIdefines"Green"tomeanthecontentofChlorine(Cl)andBromine(Br)basedflameretardantsmeetJS709Blowhalogenrequirementsof<=1000ppmthreshold.
Antimonytrioxidebasedflameretardantsmustalsomeetthe<=1000ppmthresholdrequirement.
(3)MSL,PeakTemp.
-TheMoistureSensitivityLevelratingaccordingtotheJEDECindustrystandardclassifications,andpeaksoldertemperature.
(4)Theremaybeadditionalmarking,whichrelatestothelogo,thelottracecodeinformation,ortheenvironmentalcategoryonthedevice.
(5)MultipleDeviceMarkingswillbeinsideparentheses.
OnlyoneDeviceMarkingcontainedinparenthesesandseparatedbya"~"willappearonadevice.
IfalineisindentedthenitisacontinuationofthepreviouslineandthetwocombinedrepresenttheentireDeviceMarkingforthatdevice.
(6)Leadfinish/Ballmaterial-OrderableDevicesmayhavemultiplematerialfinishoptions.
Finishoptionsareseparatedbyaverticalruledline.
Leadfinish/Ballmaterialvaluesmaywraptotwolinesifthefinishvalueexceedsthemaximumcolumnwidth.
ImportantInformationandDisclaimer:TheinformationprovidedonthispagerepresentsTI'sknowledgeandbeliefasofthedatethatitisprovided.
TIbasesitsknowledgeandbeliefoninformationprovidedbythirdparties,andmakesnorepresentationorwarrantyastotheaccuracyofsuchinformation.
Effortsareunderwaytobetterintegrateinformationfromthirdparties.
TIhastakenandcontinuestotakereasonablestepstoproviderepresentativeandaccurateinformationbutmaynothaveconducteddestructivetestingorchemicalanalysisonincomingmaterialsandchemicals.
TIandTIsuppliersconsidercertaininformationtobeproprietary,andthusCASnumbersandotherlimitedinformationmaynotbeavailableforrelease.
InnoeventshallTI'sliabilityarisingoutofsuchinformationexceedthetotalpurchasepriceoftheTIpart(s)atissueinthisdocumentsoldbyTItoCustomeronanannualbasis.
OTHERQUALIFIEDVERSIONSOFBQ24105-Q1:PACKAGEOPTIONADDENDUMwww.
ti.
com10-Dec-2020Addendum-Page2Catalog:BQ24105NOTE:QualifiedVersionDefinitions:Catalog-TI'sstandardcatalogproductTAPEANDREELINFORMATION*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQReelDiameter(mm)ReelWidthW1(mm)A0(mm)B0(mm)K0(mm)P1(mm)W(mm)Pin1QuadrantBQ24105IRHLRQ1VQFNRHL203000330.
012.
43.
84.
81.
68.
012.
0Q1PACKAGEMATERIALSINFORMATIONwww.
ti.
com27-Jul-2013PackMaterials-Page1*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQLength(mm)Width(mm)Height(mm)BQ24105IRHLRQ1VQFNRHL203000367.
0367.
035.
0PACKAGEMATERIALSINFORMATIONwww.
ti.
com27-Jul-2013PackMaterials-Page2NOTES:1.
Alllineardimensionsareinmillimeters.
Anydimensionsinparenthesisareforreferenceonly.
DimensioningandtolerancingperASMEY14.
5M.
2.
Thisdrawingissubjecttochangewithoutnotice.
3.
Thepackagethermalpadmustbesolderedtotheprintedcircuitboardforthermalandmechanicalperformance.
PACKAGEOUTLINE4219071/A05/2017www.
ti.
comVQFN-1mmmaxheightPLASTICQUADFLATPACK-NOLEADRHL0020AA0.
08C0.
1CAB0.
05CBSYMMSYMMPIN1INDEXAREASEATINGPLANEC1PIN1ID(OPTIONAL)2.
05±0.
13.
05±0.
13.
63.
44.
64.
41MAX(0.
2)TYP2X(0.
55)2X3.
514X0.
52910111219202X1.
54X(0.
2)20X0.
290.
1920X0.
50.
321NOTES:(continued)4.
Thispackageisdesignedtobesolderedtoathermalpadontheboard.
Formoreinformation,seeTexasInstrumentsliteraturenumberSLUA271(www.
ti.
com/lit/slua271).
5.
Soldermasktolerancesbetweenandaroundsignalpadscanvarybasedonboardfabricationsite.
6.
Viasareoptionaldependingonapplication,refertodevicedatasheet.
Ifanyviasareimplemented,refertotherilocationsshownonthisview.
Itisrecommendedthatviasunderpastebefilled,pluggedortented.
EXAMPLEBOARDLAYOUT4219071/A05/2017www.
ti.
comVQFN-1mmmaxheightRHL0020APLASTICQUADFLATPACK-NOLEADSYMMSYMMLANDPATTERNEXAMPLEEXPOSEDMETALSHOWNSCALE:18X2X(1.
5)6X(0.
525)4X(0.
775)(4.
3)(3.
3)20X(0.
6)20X(0.
24)14X(0.
5)(3.
05)(2.
05)(R0.
05)TYP(0.
2)VIATYP)12910111219200.
07MAXALLAROUND0.
07MINALLAROUNDSOLDERMASKDETAILSNONSOLDERMASKDEFINED(PREFERRED)SOLDERMASKDEFINEDMETALSOLDERMASKOPENINGSOLDERMASKOPENINGMETALUNDERSOLDERMASK212X(0.
75)2X(0.
4)SOLDERMASKOPENINGMETALUNDERSOLDERMASK4X(0.
2)2X(0.
55)EXPOSEDMETALEXPOSEDMETALNOTES:(continued)7.
Lasercuttingapertureswithtrapezoidalwallsandroundedcornersmayofferbetterpasterelease.
IPC-7525mayhavealternatedesignrecommendations.
.
EXAMPLESTENCILDESIGN4219071/A05/2017www.
ti.
comVQFN-1mmmaxheightRHL0020APLASTICQUADFLATPACK-NOLEADSYMMSYMMSOLDERPASTEEXAMPLEBASEDON0.
1mmTHICKSTENCILEXPOSEDPAD75%PRINTEDCOVERAGEBYAREASCALE:20X(4.
3)2X(1.
5)(3.
3)(1.
05)TYP6X(0.
92)6X(0.
85)14X(0.
5)20X(0.
24)20X(0.
6)(0.
56)TYPMETALTYP214X(0.
2)2X(0.
25)(0.
55)TYPSOLDERMASKEDGETYP2X(0.
775)1291011121920(R0.
05)TYPIMPORTANTNOTICEANDDISCLAIMERTIPROVIDESTECHNICALANDRELIABILITYDATA(INCLUDINGDATASHEETS),DESIGNRESOURCES(INCLUDINGREFERENCEDESIGNS),APPLICATIONOROTHERDESIGNADVICE,WEBTOOLS,SAFETYINFORMATION,ANDOTHERRESOURCES"ASIS"ANDWITHALLFAULTS,ANDDISCLAIMSALLWARRANTIES,EXPRESSANDIMPLIED,INCLUDINGWITHOUTLIMITATIONANYIMPLIEDWARRANTIESOFMERCHANTABILITY,FITNESSFORAPARTICULARPURPOSEORNON-INFRINGEMENTOFTHIRDPARTYINTELLECTUALPROPERTYRIGHTS.
TheseresourcesareintendedforskilleddevelopersdesigningwithTIproducts.
Youaresolelyresponsiblefor(1)selectingtheappropriateTIproductsforyourapplication,(2)designing,validatingandtestingyourapplication,and(3)ensuringyourapplicationmeetsapplicablestandards,andanyothersafety,security,orotherrequirements.
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MailingAddress:TexasInstruments,PostOfficeBox655303,Dallas,Texas75265Copyright2020,TexasInstrumentsIncorporated