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SacPower智联创新RT9271WhiteLEDStep-UpConverterinTinyPackageGeneralDescriptionFeaturesTheRT9271isastep-upDC/DCconverterspecificallyzInherentlyMatchedLEDCurrentdesignedtodrivewhiteLEDswithaconstantcurrent.ThezUpto80mAOutputCurrent@VOUT<12VdevicecandriveonetothreeLEDsinseriesfromaLi-IonzHighEfficiency:85%Typicalcell.SeriesconnectionoftheLEDsprovidesidenticalLEDzDrivesUptoThreeLEDsfrom2.8VSupplycurrentsresultinginuniformbrightnessandeliminatingz20VInternalSwitchtheneedforballastresistors.TheRT9271switchesat1.1zFast1.1MHzSwitchingFrequencyMHz,allowingtheuseoftinyexternalcomponents.ThezUsesTiny1mmHeightInductorsinputandoutputcapacitorcanbeassmallas1uF,savingzRequiresOnly1uFOutputCapacitorspaceandcostversusalternativesolutions.Alow0.25VzLowProfileSOT-23-6PackagefeedbackvoltageminimizespowerlossinthecurrentzOptional15VOverVoltageProtectionsettingresistorforbetterefficiency.zRoHSCompliantand100%Lead(Pb)-FreeTheRT9271isavailableinlowprofileSOT-23-6package.ApplicationszMobilePhoneOrderingInformationzDigitalStillCameraRT9271zPDAs,HandheldComputersPackageTypezMP3PlayersB:SOT-23-5E:SOT-23-6zGPSReceiversOperatingTemperatureRangeP:PbFreewithCommercialStandardPinConfigurationsG:Green(HalogenFreewithCommer-cialStandard)(TOPVIEW)Note:VCCENVCCOVPENRichTekPb-freeandGreenproductsare:54`RoHScompliantandcompatiblewiththecurrentrequire-654mentsofIPC/JEDECJ-STD-020.123123`SuitableforuseinSnPborPb-freesolderingprocesses.`100%mattetin(Sn)plating.LXGNDFBLXGNDFBSOT-23-5SOT-23-6MarkingInformationNote:Thereisnopin1indicatorontopmarkforSOT-23-6Formarkinginformation,contactoursalesrepresentativetype,andpin1willbelowerleftpinwhenreadingtopmarkdirectlyorthroughaRichTekdistributorlocatedinyourfromlefttoright.area,otherwisevisitourwebsitefordetail.E-mail:nikozhong@hotmail.comhttp//www.sacpower.net联系人:钟先生0755-839832801RT9271TypicalAppIicationCircuitC1LXD11uF10uHSS0520VIN2.4to3.2VVCCLXC3D21uFENOVPDimmingControlGNDFBR212Figure1.RT9271Drivers
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