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
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