GENERALDESCRIPTIONThePW2057isac***tantfrequency,currentmodestep-downconverter.ThedeviceintegratesamainswitchandasynchronousrectifierforhighefficiencywithoutanexternalSchottkydiode.ItisidealforpoweringportableequipmentthatrunsfromasinglecellLithium-Ion(Li+)battery.100%dutycyclecapabilityextendsbatterylifeinportabledevices,whilethequiescentcurrentis200μAwithnoload,anddropsto<1μAinshutdown.FEATURESHighEfficiency:Upto95%1.0MHzFrequencyOperation2.2Vto5.5VInputVoltageRangeCurrentModeOperationforExcellentLineandLoadTransientResp***eLowQuiescentCurrent:200μAOutputVoltage:0.6V～5.5VAutomaticPWM/PFMModeSwitchingNoSchottkyDiodeRequiredShort-CircuitProtectionShutdownQuiescentCurrent:<1μALowProfileSOT-23-5LPackage(lead-free)APPLICATI***DigitalcamerasandMP3Palmtopcomputers/PDAsCellularphonesPCca***Portablemediaplayers)