一级代理BL4054SOT23-5上海贝岭，批号：全新，库存：25000只（长期现货）。原装***，现货热销。。。BL4054FEATURESProgrammableChargeCurrentUpto800mANoMOSFET,SenseResistororBlockingDiodeRequiredPreset4.2VChargeVoltagewith&plu***n;1%AccuracyChargeCurrentMonitorOutputforGasGaugingThermalRegulationMaximizesChargeRateWithoutRiskofOverheatingChargesSingleCellLi-IonBatteriesDirectlyfromUSBPortOver-VoltageProtectAutomaticRechargeChargeStatusOutputPinC/10ChargeTermination25mASupplyCurrentinShutdown2.9VTrickleChargeThresholdSoft-StartLimitsInrushCurrent***ailablein5-LeadSOT-23PackageDESCRIPTIONTheBL4054/BL4054Bisacompletec***tantcurrent/c***tantvoltagelinearchargerforsinglecellLithium-Ionbatteries.Noexternalsenseresistorisneeded,andnoblockingdiodeisrequiredduetotheinternalMOSFETarchitecture.Thermalfeedbackregulatesthechargecurrenttolimitthedietemperatureduringhighpoweroperationorhighambienttemperature.Thechargevoltageisfixedat4.2V,andthechargecurrentcanbeprogrammedexternallywithasingleresistor.TheBL4054/BL4054Bautomatical-lyterminatesthechargecyclewhenthechargecurrentdropsto1/10theprogrammedvalueafterthefinalfloatvoltageisreached.Whentheinputsupply(walladapterorUSBsupply)isremoved,theBL4054/BL4054Bautomaticallyentersalowcurrentstate,droppingthebatterydraincurrenttolessthan2mA.TheBL4054/BL4054Bcanbeputintoshutdownmode,reducingthesupplycurrentto25mA.Otherfeaturesincludechargecurrentmonitor,under-voltagelockout,automaticrechargeandastatuspintoindicatechargeterminationandthepresenceofaninputvoltage.TheonlydifferencebetweenBL4054andBL4054Bisthatatpoweron,BL4054willcheckthebatteryvoltagefirst,itwillnotstartchargingunlessthebatteryvoltageisbelowtheauto-rechragethreshold.BL4054Bdoesnotperformthischeck.SoBL4054Bcanguaranteethehighbatterycapacityatalltime,whileBL4054canpreventthebatteryfrombeingrepeatedlychargedinsomespecificapplicati***.)