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PT4103WhiteLEDStep-UpConverterGENERALDESCRIPTIONFEATURESThePT4103isastep-upDC/DCconverterdesignedforzDrivesUpto5SeriesWhiteLEDsfrom2.5Vdrivingupto8whiteLEDsinseriesfromasinglecellzDrivesUpto8SeriesWhiteLEDsfrom3.6VLithiumIonbatterywithconstantcurrent.BecauseitzUpto87%Efficiencydirectlyregulatesoutputcurrent,thePT4103isidealforz1.2MHzFixedSwitchingFrequencydrivinglightemittingdiodes(LEDs)whoselightzLow104mVFeedbackVoltageintensityisproportionaltothecurrentpassingthroughzOpenLoadShutdownthem,notthevoltageacrosstheirterminals.AsinglezSoftStart/PWMDimmingexternalresistorsetsLEDcurrentbetween5mAandzSOT23-6Packages20mA,whichcanthenbeeasilyadjustedusingeitheraDCvoltageorapulsewidthmodulated(PWM)signal.zRoHScompliantItslow104mVfeedbackvoltagereducespowerlossAPPLICATIONSandimprovesefficiency.TheOVpinmonitorstheoutputvoltageandturnsofftheconverterifanzCellPhonesover-voltageconditionispresentduetoanopencircuitzHandheldComputersandPDAscondition.ThePT4103isavailableinSOT23-6zDigitalCameraspackages.zSmallLCDDisplaysORDERINGINFORMATIONTEMPERATUREORDERINGPARTTRANSPORTPACKAGEMARKINGRANGENUMBERMEDIAooTapeandReelSOT23-6-40Cto85CPT4103B23F41033000unitsTYPICALAPPLICATIONSKEYPERFORMANCECHARTEfficiencyvsn(LED)90.00%3LED85.00%4LED5LED6LED80.00%7LED8LED75.00%510152025Iout(mA)Vin=3.6VFigure1.Li-IonDriverforSixWhiteLEDsFigure2.EfficiencyvsNumberofLEDsPT4103WhiteLEDStep-UpConverterPINASSIGNMENTPINDESCRIPTIONSSOTPINDESCRIPTIONPINNo.Names1SWPowerSwitchOutput.ConnecttheinductorandtheblockingSchottkydiodetoSW.2GNDGround3FBFeedbackinputpin.Thereferencevoltageatthispinis104mV.ConnectthecathodeofthelowestLEDtoFBandacurrentsenseresistorbetweenFBandGND.4ENEnablepin.AhighinputatENenablesthedeviceandalowinputdisablesthedevices.Whennotused,connectENtotheinputsourceforautomaticstartup.5OVOverVoltageInput.OVmeasurestheoutputvoltageforopencircuitprotection.ConnectOVtotheoutputatthetopoftheLEDstring.6INInputSupplyPin.Mustb
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