GeneralDescriptionTheLT***054isacompletec***tant-current/c***tantvoltagelinearchargerforsinglecelllithium-ionbatteries.ItsThinSOTpackageandlowexternalcomponentcountmaketheLT***054ideallysuitedforportableapplicati***.Furthermore,theLT***054isspecificallydesignedtoworkwithinUSBpowerexternalsenseresistorisneeded,andnoblockingdiodeisrequiredduetotheinternalMOSFETarchitecture.Thermalfeedbackregulatesthechargecurrenttolimitthedietemperatureduringhighpoweroperationorhighambienttemperature.Thechargevoltageisfixedat4.2V,andthechargecurrentcanbeprogrammedexternallywithasingleresistor.TheLT***054automaticallyterminatesthechargecyclewhenthechargecurrentdropsto1/10ththeprogrammedvalueafterthefinalfloatvoltageisreached.Whentheinputsupply(walladapterorUSBsupply)isremoved,theLT***054automaticallyenetrsalowcurrentstate,droppingthebatterydraincurrenttolessthan2μA.TheLT***054canbeputintoshudtownmode,reducinghesupplycurrentto25μA.Otherfeaturesincludechargecurrentmonitor,undervoltagelockout,automaticrechargeandastatuspintoindicatechargeterminationandthepresenceofaninputvoltage.FeaturesProgrammableChargeCurrentUpto800mANoMOSFET,SenseResistororBlockingDiodeRequiredCompleteLinearChargerinThinSOTPackageforSingleCellLithium-ionBatteriesC***tant-Current/C***tant-VoltageOperationwithThermalRegulationtoMaximizeChargeRateWithoutRiskofOverheatingChargesSingleCellLi-IonBatteriesDirectlyfromUSBPortPreset4.2VChargeVoltagewith&plu***n;1%AccuracyChargeCurrentMonitorOutputforGasGaugingAutomaticRechargeSoft-StartLimitsInrushCurrent***ailablein5-LeadSOT-23Package2.9VTrickleChargeThresholdC/10ChargeTermination25mASupplyCurrentinShutdown2.9VTrickleChargeThresholdApplicati***PortableMediaPlayers/MP3playersCellularand***artmobilephoneChargingDocksandCradlesBluetoothApplicati***)