EUP2584A.pdf

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1、EUP2584AWhiteLEDStep-UpConverterInTinySOT-23PackageDESCRIPTIONFEATURESTheEUP2584Aisaconstantcurrentstep-upconverterò2.6Vto5.5VInputRangespecificallydesignedtodrivewhiteLEDs.TheStep-upò27VOutputwithOverVoltageProtectionconvertertopologyallowsseriesconnectionoftheòHighEfficiency:85%Typicalwhite

2、LEDssotheLEDcurrentsareidenticalforòInternalSoft-Startuniformbrightness.TheEUP2584Aswitchesat1.1MHz,allowingtheuseoftinyexternalcomponents.òPWMDimmingControlTheinputandoutputcapacitorcanbeassmallas1µF,òInternalHighPower30VMOSFETSwitchsavingspaceandcostversusalternativesolutions.AòFast1.1MHzSw

3、itchingFrequencylow0.3Vfeedbackvoltageminimizespowerlossinthecurrentsettingresistorforbetterefficiency.EUP2584AòSmall,Low-ProfileInductorsandCapacitorsisenhancedwithSoft-StartfunctionandthatcouldòSOT23-6Packagesignificantlyreducenoiseinducedbycapacitor.òRoHSCompliantand100%Lead(Pb)-FreeTheEUP

4、2584AisavailableinlowprofileSOT23-6package.APPLICATIONSòMobilePhoneòDigitalStillCameraòPDAs,HandheldComputersòMP3PlayersòGPSReceiversTypicalApplicationCircuitFigure1.WhiteLEDApplicationDS2584AVer1.0Nov.20071EUP2584APinConfigurationsPackageTypePinConfigurationsSOT23-6PinDescriptionPINSOT23-6DE

5、SCRIPTIONChipEnablePin.Connectto1.4Vorhighertoenabledevice,0.3VorlesstodisableEN1device.OvervoltageSense.WhenVOUTisgreaterthan27V,theinternalN-channelMOSFETOUT2turnsoffuntilVOUTdropsbelow25V,thentheICreentersstart.Connecta1uFcapacitorfromOUTtoGND.IN3InputSupplyVoltageLX4SwitchPin.Connectinduc

6、tor/diodehere.MinimizetraceareaatthispintoreduceEMI.GND5CommonGroundFeedbackPin.Referencevoltageis0.3V.ConnectcathodeoflowestLEDandresistorFB6here.Calculateresistorvalueaccordingtotheformula:RFB=0.3/ILEDDS2584AVer1.0Nov.20072EUP2584AOrderingInformationOrderNumberPackageTypeMarkingOperatingTem

7、peraturerangeEUP2584AVIR1SOT23-6f0□□□□-40°Cto125°CEUP2584A□□□□LeadFreeCode1:LeadFree0:LeadPackingR:Tape&ReelOperatingtemperaturerangeI:IndustryStandardPackageTypeV:SOT23BlockDiagramFigure2.DS2584AVer1.0Nov.20073EUP2584AAbsoluteMaximumRatings¢