GeneralDescriptionTheKX3605isastep-upDC/DCconverterbasedon1.5xchargepumpcurrentsource,itisspeciallydesignedforLEDsuppliesinbacklightdisplay.TheKX3605canprovideconstantcurrentupto20mAforeachLED,whichisprogrammedbyanexternalresistor,soithasatotalcapabilitytoprovide80mAfor4LEDs.ThechiphasagoodperformanceofLEDcurrentmatchingandallowsPWMbrightnessdimmingcontrol.Additionally,highswitchingfrequencyupto1MHzenablestheuseoftwosmallexternalflyingcapacitors.Internalsoft-startcircuitrypreventsexcessiveinrushcurrentduringstart-up.TheKX3605supplyvoltagerangeisfrom2.7Vto5.5V,ideallysuitedforapplicationspoweredbytheLiionbattery.TheKX3605isavailableina3mmx3mmQFN-3x3-16tinypackage.Itsoperatingtemperaturerangeis-40oCto85oC.Features RegulatedOutputCurrentwith 3%Matching Regulated 10%OutputCurrentSource Driveupto4LEDsat20mAEach WideOperatingVoltageRange:2.7Vto5.5V HighEfficiencyupto93% HighOperatingFrequency:1MHz Built-inSoft-StarttoLimittheInrushCurrent LEDBrightnessControlthroughPWMandAnalogSignal PWMDimmingFrequencyupto50kHz Built-inStandbyModetoGetPWMDimmingDutyCycleControlLinearity Built-inOTSD(OverTemperatureShutdown)FunctiontoProtecttheDevicefromBurnOutApplications MobilePhone MP3,MP4 WhiteLEDBacklightinMobilePhone,PDAwww.szkxw.com