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PT5747SFeaturesGeneralDescriptionnLEDPowerEfficiency:upto90%ThePT5747Sisaset-upDC-DCconverterthatnCurrentAccuracy:±5%(VIN=3.6Vto1.8Vdeliversaregulatedoutputcurrent.Thedevice@VF=3.7V)switchesata1.0MHzconstantfrequency,nLowStart-UpVoltage:0.9V(ILED=270mA)allowingfortheuseofsmallvalueexternalinductorandceramiccapacitors.nLowHoldVoltage:0.75V(ILED=200mA)n1MHzSwitchingFrequencynUsessmall,LowProfileExternalComponentsThePT5747SistargetedtobeusedfordrivingnLowRDS(ON):100mΩ(TYP.)loadsupto1Afromatwo-cellalkalinebattery.ThenOverTemperatureProtectionLEDcurrentcanbeprogrammedbytheexternalnLowProfileSOT-23-6Packagecurrentsenseresistor,Rs,connectedbetweenthenPb-FreePackagefeedbackpin(FB)andground.Alow95mVfeedbackvoltagereducesthepowerlossintheRsforbetterefficiency.Withitsinternal2A,100mΩApplicationsNMOSswitch,thedevicecanprovidehighefficiencyevenatheavyload.DuringthenWhiteLEDTorch(Flashlight)shutdownmode,thefeedbackresistorRsandthenWhiteLEDCameraFlashloadarecompletelydisconnectedandthecurrentnDSC(DigitalStillCamera)Flashconsumptionisreducedtolessthan1uA.nCellularCameraPhoneFlashnPDACameraFlashThePT5747Sisavailableinthe6-leadSOT-23-6nCamcorderTorch(Flashlight)Lamppackage.TypicalApplicationBlockDiagramVOUTVINSWComparator2.2uH95mV+ReferenceA1-1-RcA2PWMLogicSW+AndDriver6VINVOUT5CcFBC+IN3WΣ10uFPT5747SWLEDVIN-SHDNFB34COOFFONRampR10uFGeneratorGNDS2SHDNShutdownAnd1.0MHzOscillatorSoft-startGNDILED=750mA,RS=0.127Ω1PT5747SPinConfigurationSOT--236654123PinNumberNameFunction1SWSwitch2GNDGround3FBFeedback4SHDNShutDown5VOUTOutput6VINInputAbsoluteMaximumRatingsThesearestressratingsonlyandfunctionaloperationisnotimplied.Exposuretoabsolutemaximumratingsforprolongedtimeperiodsmayaffectdevicereliability.Allvoltagesarewithrespecttoground.InputPinVoltage...............................–0.3Vto6VOperatingTemperatureRange.........-40Cto85CSWPinVoltage..................................–0.3Vto6VStorageTemperatureRange.......
