BQ2057SN中文资料




 
SLUS025F−MAY2001−REVISEDJULY2002    1
IdealforSingle(4.1Vor4.2V)andDual-Cell(8.2Vor8.4V)Li-IonorLi-PolPacks
RequiresSmallNumberofExternalComponents
0.3VDropoutVoltageforMinimizingHeatDissipation
BetterThan±1%VoltageRegulationAccuracyWithPresetVoltages
AutoCompDynamicCompensationofBatteryPack’sInternalImpedancetoReduceChargeTime
OptionalCell-TemperatureMonitoringBeforeandDuringCharge
IntegratedVoltageandCurrentRegulationWithProgrammableCharge-CurrentandHigh-orLow-SideCurrentSensing
IntegratedCellConditioningforRevivingDeeplyDischargedCellsandMinimizingHeatDissipationDuringInitialStageOfCharge
ChargeStatusOutputforSingleorDualLedorHostProcessorInterface
AutomaticBattery-RechargeFeature
ChargeTerminationbyMinimumCurrent
AutomaticLow-PowerSleepModeWhenVCCIsRemoved
EVMsAvailableforQuickEvaluation
Packaging:8-PinSOIC,8-PinTSSOP,8-PinMSOPDESCRIPTIONTheBENCHMARQbq2057seriesadvancedLithium-Ion(Li-Ion)andLithium-Polymer(Li-Pol)linearcharge-managementICsaredesignedforcost-sensitiveandcompactportableelectronics.Theycombinehigh-accuracycurrentandvoltageregulation,batteryconditioning,temperaturemonitoring,chargetermination,charge-statusindication,andAutoCompcharge-ratecompensationinasingle8-pinIC.MSOP,TSSOP,andSOICpackageoptionsareofferedtofitawiderangeofendapplications.Thebq2057continuouslymeasuresbatterytemperatureusinganexternalthermistor.Forsafety,thebq2057inhibitschargeuntilthebatterytemperatureiswithinuser-definedthresholds.Thebq2057thenchargesthebatteryinthreephases:conditioning,constantcurrent,andconstantvoltage.Ifthebatteryvoltageisbelowthelow-voltagethreshold,V(min),thebq2057prechargesusingalowcurrenttoconditionthebattery.Theconditioningchargerateisapproximately10%oftheregulationcurrent.Theconditioningcurrentalsominimizesheatdissipationintheexternalpass-elementduringtheinitialstageofthecharge.Afterconditioning,thebq2057appliesaconstantcurrenttothebattery.Anexternalsense-resistorsetsthecurrent.Thesense-resistorcanbeoneitherthehighorlowsideofthebatterywithoutadditionalcomponents.Theconstant-currentphasecontinuesuntilthebatteryreachesthecharge-regulationvoltage.COMPCCVSSSTAT87651234SNSBATVCCTSbq2057xSNorbq2057xTSSOIC(SN)orTSSOP(TS)PACKAGE(TOPVIEW)BATSNSCOMPCC87651234VCCTSSTATVSSbq2057xDGKMSOP(DGK)PACKAGE(TOPVIEW)  !#$%!&'()%$&!*(
+'$%!,$%)-!,('%&'!!#%!&*)''$%!&*)%.)%)#&! )/$&&%(#)%&&%$,$,0$$%1-!,('%!*!')&&2,!)&!%)')&&$+1'+(,)%)&%2!$++*$$#)%)&-AutoCompisatrademarkofTexasInstruments.Copyright2002,TexasInstrumentsIncorporatedPleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.


 
SLUS025F−MAY2001−REVISEDJULY20022(continued)Thebq2057thenbeginstheconstant-voltagephase.Theaccuracyofthevoltageregulationisbetterthan±1%overtheoperating-temperatureandsupply-voltageranges.Forsingleanddualcells,thebq2057isofferedinfourfixed-voltageversions:4.1V,4.2V,8.2V,and8.4V.Chargestopswhenthecurrenttaperstothechargeterminationthreshold,I(TERM).Thebq2057automaticallyrestartsthechargeifthebatteryvoltagefallsbelowtheV(RCH)threshold.ThedesigneralsomayusetheAutoCompfeaturetoreducechargingtime.Thisproprietarytechniqueallowssafeanddynamiccompensationfortheinternalimpedanceofthebatterypackduringcharge.AVAILABLEOPTIONSPACKAGETACHARGEREGULATIONVOLTAGESOIC(SN)TSSOP(TS)MSOP†(DGK)4.1VNotavailablebq2057TSbq2057DGK−20°Cto70°C4.2Vbq2057CSNbq2057CTSbq2057CDGK−20°Cto70°C8.2VNotavailablebq2057TTSNotavailable8.4Vbq2057WSNbq2057WTSNotavailable†Notethedifferenceinpinoutforthispackage.


 
SLUS025F−MAY2001−REVISEDJULY20023−V(SNS)VSS−V(SNS)VCC0.5VCCI-ControlControlBlockG(comp)BATCOMPTSSNSCCSTATVSSVCC


 
SLUS025F−MAY2001−REVISEDJULY20024(SN)andTSSOP(TS)MSOP(DGK)I/ODESCRIPTIONBAT28IVoltagesenseinputCC75OChargecontroloutputCOMP86ICharge-ratecompensationinput(AutoComp)SNS17ICurrentsenseinputSTAT53OChargestatusoutputTS42ITemperaturesenseinputVCC31ISupplyvoltageVSS64Grounddetaileddescriptioncurrent-senseinputBatterycurrentissensedviathevoltagedevelopedonthispinbyanexternalsenseresistor.Theexternalresistorcanbeplacedoneitherthehighorlowsideofthebattery.(Seeschematicsfordetails.)battery-voltageinputVoltagesense-inputtieddirectlytothepositivesideofthebattery.temperaturesenseinputInputforanexternalbattery-temperaturemonitoringcircuit.ConnectingthisinputtoVCC/2disablesthisfeature.charge-statusoutput3-stateindicationofchargeinprogress,chargecomplete,andtemperaturefaultorsleepmode.charge-controloutputS