VA7204L2

VA7204L2AdvancedLinearChargerICforASingleLithium-ionBatteryFEATURES„IdealforasingleLi-ionbattery„Inputvoltagerange:4.5V~6.5V„ProgrammablechargecurrentUpto500mA„NoMOSFET,senseresistororblockingdioderequired„Constantcurrent/Constantvoltageoperationwiththermalregulationtomaximizechargeratewithoutriskofoverheating„ChargessinglecellLi-IonbatteriesdirectlyfromUSBport„Betterthan±1%voltageregulationaccuracy„Automaticbatteryrecharge„TwoLEDschargestatusindication„Chargeterminationbyminimumcurrent„25μAsupplycurrentinshutdown„Lessthan1μAbatterycurrentinstandbymode„Shortprotection„Automaticlow-powersleepmodewhenVCCislowerthanthebatteryvoltage„Fewexternalcomponents„Smallpackage:SOT23-6APPLICATIONS„Bluetooth„MP3„DCS„GPS„ChargerDESCRIPTIONVA7204L2isasinglecellLithium-Ion(Li-Ion)linearchargerICdesignedforcost-sensitiveandcompactportableelectronics.Itcombineshigh-accuracycurrent,voltageregulation,batteryconditionmonitoring,thermalregulation,chargetermination,andchargestatusindicationinasingle6-pinIC.VA7204L2monitorsthebatterychargingstatusbydetectingthebattervoltage.VA7204L2chargesthebatteryinthreephases:preconditioning,constantcurrentandconstantvoltage.Ifthebatteryvoltageisbelowthelow-voltagethresholdVMIN(normallyat3V),VA7204L2prechargesthebatteryusingalowcurrent.Theconditioningchargecurrentcanbeadjustedwithanexternalresistor.WhenthebatteryvoltagereachesVMIN,VA7204L2appliesaconstantcurrenttochargethebattery.Anexternalsenseresistorcontrolsthecurrent.Theconstantcurrentchargingcontinuesuntilthebatteryvoltagereachesthechargeregulationvoltage(normallyat4.2V).AndthenVA7204L2enterstheconstantvoltagechargingphase.Theaccuracyofthevoltageregulationisbetterthan±1%overtheoperatingtemperatureandsupplyvoltagerange.Underthecondition,thechargingcurrentgraduallydecreases.Chargestopswhenthecurrenttaperstothechargeterminationthreshold,ITERM.VA7204L2monitorsthebatteryvoltagecontinuouslyandentersanewcycleofchargingifthebattery’svoltagefallsbelowVRECHG(normallyatVREG-150mV).TYPICALAPPLICATIONDIAGRAMFigure1VA7204L2FunctionalDiagramDatasheet(V1.1)Copyright©vimicro,Inc.1999-20111VA7204L2ORDERINGINFORMATION[Table1]OrderingInformationMODELOUTPUTVOLTAGERECHARGINGVOLTAGEPACKAGEPINCOUNTPRINTMARKINGVA7204L24.2V4.05VSOT23-667024BPINCONFIGURATIONSFigure2VA7204L2PinConfigurations(Nottoscale)PINDESCRIPTION[Table2]PinDescriptionNAMEORDERI/OFUNCTIONCHRG1OOpen-drainchargestatusoutput.Whenthebatteryischarging,theCHRGpinispulledlowbyaninternalN-MOSFET.Whenachargecycleiscompletedorthechargerdetectsanundervoltagelockoutcondition,CHRGisforcedhighimpedance.GND2POWConnecttothenegativeofpowersupply.BAT3I/OChargecurrentoutputandbatteryvoltagesenseinputVCC4POWPowerSupplyInputLED25OOpen-drainchargestatusoutput.Whenthebatteryischargingorthechargerdetectsanundervoltagelockoutcondition,theLED2pinisforcedhighimpedance.Whenachargecycleiscompleted,theLED2pinispulledlowbyaninternalN-MOSFET.PROG6I/OChargecurrentsetandshutdownpin.Datasheet(V1.1)Copyright©vimicro,Inc.1999-20112VA7204L2ABSOLUTEMAXIMUMRATINGSupplyVoltage(VCC),BAT,CHRG,LED2InputVoltage................................................-0.3V~-7VPROGInputVoltage..................-0.3V~VCC+0.3VOperatingAmbientTemperatureRange,TA........................................................-40℃~+85℃JunctionTemperature................................150℃TotalPowerDissipation,PD（TA=25℃）SOT23-6package(θJA=200/W℃)............625mWStorageTemperatureRange...........-65℃~150℃LeadTemperature（Soldering，10seconds）260℃ESD(HBM)....................................................5kVNote:Stressesbeyondthoselistedunder“absolutemaximumratings”maycausepermanentdamagetothedevice.Thesearestressratingsonlyandfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondtherecommendedoperatingconditionarenotimplied.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.ELECTRICALCHARACTERISTICS(VCC=5V,TA=25℃unlessotherwisespecified.)[Table3]ElectricalSpecificationPARAMETERSYMBOLTESTCONDITIONMINTYPMAXUNITPowerSupplyVoltageVCC4.56.5VCharging,RPROG=2K550μAChargeEnd.65μAShutdownMode.RPROGisnotconnected.VBAT=1.5V~4.2V20μAPowerSupplyCurrentICCSleepMode.VBAT=1.5V~4.2V15μACCMode.RPROG=2K500mAStandbyMode.VBAT=4.2V-1μAShutdownMode.RPROGisnotconnected.VBAT=1.5V~4.2V-1μABatteryCurrentIBATSleepMode.VCC=0V-1μAInputVoltageUnderVoltageLockoutHighThresholdVUVH3.8VInputVoltageUnderVoltageLockoutLowThresholdVUVL3.6VRegulationVoltageVREGRPROG=2K(CVMode)IBAT=40mA4.1584.24.242VRechargeThresholdVRECHRG4.05VPreconditioningVoltageHighThresholdVPREH3.0VPreconditioningVoltageLowThresholdVPREL2.8VOutputShortCircuitThresholdVSHORT1.4VChargecurrentunderbatteryshortconditionISHORT-CHG3.3%*IBATDatasheet(V1.1)Copyright©vimicro,Inc.1999-20113VA7204L2Datasheet(V1.1)Copyright©vimicro,Inc.1999-20114PARAMETERSYMBOLTESTCONDITIONMINTYPMAXUNITOutputCurrentSetVoltageVPROG1VOutputCurrentSetFactorKSET1000CHRGPinOutputLowVoltageVCHRGICHRG=10mA70mVLED2PinOutputLowVoltageVLED2ILED2=10mA70mVSoftStartTimeTSS100μSRechargeDelayTimeTRECHRG2msChargeTerminateDelayTimeTTER