使用Microchip的独立锂离子电池充电管理控制器的设计锂离子电池充电器和负载共享系统

Batteriesoftenserveasthemainenergysourcefor

portableelectronicdevices.Althoughtheydependon

batteries,portableconsumerelectronicproducts,

suchasGPSdevicesandmulti-mediaplayers,often

consumeenergydirectlyfromanac-dcwalladapteror

accessorypoweradapter(or“AutoAdapter”)whenthe

batteryisloworthedeviceisinastationarymode.

Duetotheircosteffectivenessovertheirusefullife,

rechargeablebatteriesareoftenusedforthepower

sourceoftheportableelectronicdevice.Attributes

suchas“relativelyhighenergydensity”and“mainte-

nancefree”makeLithium-Ion(Li-Ion)batteriespopular

intheportableconsumerelectronicproducts.Referto

theapplicationnote,AN1088,"SelectingtheRightBat-

terySystemForcostSensitivePortableApplications

WhilemaintainingExcellentQuality"(DS01088)for

characteristicsofLi-Ionbatteries.Someexamplesof

howtoproperlydesignwithLi-Ionbatterieswillbe

discussedinthisapplicationnote.

Dependingontheproductdesignorlocalgovernment

regulations,rechargeablebatteriesareoftencharged

frominsidethehandhelddevicesorfrombatterycharg-

ingcradles.Duetothesafetyconcernsordesign

conceptsincertainregions,somebatteriesare

requiredtoberemovedfromtheportabledeviceprior

chargingactivitiesareinitiated.AN1149DesigningALi-IonBatteryChargerandLoadSharingSystemWithMicrochip’sStand-AloneLi-IonBatteryChargeManagementControllerAuthor:BrianChuHowever,mostofthetime,batteriesaredesignedtobeMicrochipTechnologyInc.rechargedwhilethedevicesarestillintheoperationalmode.Anendusercanextendtheruntimewhilerefill-ingtheenergybacktothebatteryforthenextmobileINTRODUCTIONaction.Thepowersourcenowhastosupplythedevic