ME4054isac***tant-current/c***tant-voltagelinearchargerforsinglecelllithium-ionbatteries.ItsThinSOTpackageandlowexternalcomponentcountmaketheME4054ideallysuitedforportableapplicati***.Furthermore,theME4054isspecificallydesignedtoworkwithinUSBpowerspecificati***.Noexternalsenseresistorisneeded,andnoblockingdiodeisrequiredduetotheinternalMOSFETarchitecture.Thermalfeedbackregulatesthechargecurrenttolimitthedietemperatureduringhighpoweroperationorhighambienttemperature.Thechargevoltageisfixedat4.2V,andthechargecurrentcanbeprogrammedexternallywithasingleresistor.TheME4054automaticallyterminateshechargecyclewhenthechargecurrentdropsto1/10ththeprogrammedvalueafterthefinalfloatvoltageisreached.Whentheinputsupply(walladapterorUSBsupply)isremoved,theME4054automaticallyentersalowcurrentstate,droppingthebatterydraincurrenttolessthan2μA.TheME4054canbeputintoshutdownmode,reducingthesupplycurrentto25μA.)