AF4056isacompleteCC/CVlinearchargerforsinglecelllithium-ionbatteries.itisspecificallydesignedtoworkwithinUSBpowerSpecificati***.NoexternalsenseresistorisneededandnoblockingdiodeisrequiredduetotheinternalP-MOSFETarchitecture.Thermalfeedbackregulatesthechargecurrenttolimitthedietemperatureduringhighpoweroperationorhighambienttemperature.Thechargevoltageisfixedat4.2V,andthechargecurrentcanbeprogrammedexternallywithasingleresistor.TheAF4056automaticallyterminatesthechargecycle.whenthechargecurrentdropsto1/10ththeprogrammedvalueafterthefinalfloatvoltageisreached.Whentheinputsupply(walladapterorUSBsupply)isremovedtheAF4056automaticallyentersalowcurrentstatedroppingthebatterydraincurrenttolessthan2μA.TheAF4056canbeputintoshutdownmodereducingthesupplycurrentto55μA.OtherfeaturesincludeBatterytemperaturemonitor,under-voltagelockout,automaticrechargeandtwostatuspinstoindicatechargeandchargetermination.)