LTC4054充电芯片单锂电池

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1、LTC4054-4.2/LTC4054X-4.2StandaloneLinearLi-IonBatteryChargerwithThermalRegulationinThinSOTUFEATURESDESCRIPTIO®■ProgrammableChargeCurrentUpto800mATheLTC4054isacompleteconstant-current/constant-■NoMOSFET,SenseResistororBlockingvoltagelinearchargerforsinglecelllithium-ionbatteries.DiodeRequiredIts

2、ThinSOTpackageandlowexternalcomponentcount■TMmaketheLTC4054ideallysuitedforportableapplications.CompleteLinearChargerinThinSOTPackageforSingleCellLithium-IonBatteriesFurthermore,theLTC4054isspecificallydesignedtowork■Constant-Current/Constant-VoltageOperationwithwithinUSBpowerspecifications.The

3、rmalRegulation*toMaximizeChargeRateNoexternalsenseresistorisneeded,andnoblockingWithoutRiskofOverheatingdiodeisrequiredduetotheinternalMOSFETarchitecture.■ChargesSingleCellLi-IonBatteriesDirectlyThermalfeedbackregulatesthechargecurrenttolimitthefromUSBPortdietemperatureduringhighpoweroperationo

4、rhigh■Preset4.2VChargeVoltagewith±1%Accuracyambienttemperature.Thechargevoltageisfixedat4.2V,■ChargeCurrentMonitorOutputforGasandthechargecurrentcanbeprogrammedexternallywithGauging*asingleresistor.TheLTC4054automaticallyterminates■AutomaticRechargethechargecyclewhenthechargecurrentdropsto1/10t

5、h■ChargeStatusOutputPintheprogrammedvalueafterthefinalfloatvoltageis■C/10ChargeTerminationreached.■25mASupplyCurrentinShutdownWhentheinputsupply(walladapterorUSBsupply)is■2.9VTrickleChargeThreshold(LTC4054)removed,theLTC4054automaticallyentersalowcurrent■AvailableWithoutTrickleCharge(LTC4054X)s

6、tate,droppingthebatterydraincurrenttolessthan2mA.■Soft-StartLimitsInrushCurrentTheLTC4054canbeputintoshutdownmode,reducing■Availablein5-LeadSOT-23Packagethesupplycurrentto25mA.UAPPLICATIOSOtherfeaturesincludechargecurrentmonitor,undervoltagelockout,automaticrechargeandastatuspintoindicate■Cellu

7、larTelephones,PDAs,MP3Playerschargeterminationandthepresenceofaninputvoltage.■ChargingDocksandCradles,LTCandLTareregisteredtrademarksofLinearTechnologyCorporation.■BluetoothApplicationsThinSOTisatrademarkofLinearTechnologyCorporat