tps61040

3245DDC,DBVPACKAGE(TopView)1SWGNDFBVINENGNDSWVINNCENFB321456DRVPACKAGE(TopView)70727476788082848688900.1110100VI=5VVI=3.6VVI=2.4VEFFICIENCYvsOUTPUTCURRENTIO−OutputCurrent−mAEfficiency−%VINSWFBENGNDL110μHD1R1R2CFFCO1μFVOUTVINto28VVIN1.8Vto6VCIN4.7μF54231VO=18VTPS61040TPS61041–OCTOBER2002–REVISEDDECEMBER2010LOW-POWERDC/DCBOOSTCONVERTERINSOT-23ANDSONPACKAGESCheckforSamples:TPS61040,TPS610411FEATURESDESCRIPTION•1.8-Vto6-VInputVoltageRangeTheTPS61040/41isahigh-frequencyboostconverterdedicatedforsmalltomediumLCDbias•AdjustableOutputVoltageRangeupto28VsupplyandwhiteLEDbacklightsupplies.Thedevice•400-mA(TPS61040)and250-mA(TPS61041)isidealtogenerateoutputvoltagesupto28VfromaInternalSwitchCurrentdualcellNiMH/NiCdorasinglecellLi-Ionbattery.•Upto1-MHzSwitchingFrequencyThepartcanalsobeusedtogeneratestandard3.3-V/5-Vto12-Vpowerconversions.•28-mATypicalNo-LoadQuiescentCurrent•1-mATypicalShutdownCurrentTheTPS61040/41operateswithaswitchingfrequencyupto1MHz.Thisallowstheuseofsmall•InternalSoftStartexternalcomponentsusingceramicaswellas•AvailableinSOT23-5,TSOT23-5,tantalumoutputcapacitors.Togetherwiththethinand2×2×0.8-mmSONPackagesSONpackage,theTPS61040/41givesaverysmalloverallsolutionsize.TheTPS61040hasaninternalAPPLICATIONS400mAswitchcurrentlimit,whiletheTPS61041has•LCDBiasSupplya250-mAswitchcurrentlimit,offeringloweroutputvoltagerippleandallowstheuseofasmallerform•White-LEDSupplyforLCDBacklightsfactorinductorforlowerpowerapplications.Thelow•DigitalStillCameraquiescentcurrent(typically28mA)togetherwithan•PDAs,Organizers,andHandheldPCsoptimizedcontrolscheme,allowsdeviceoperationat•CellularPhonesveryhighefficienciesovertheentireloadcurrentrange.•InternetAudioPlayer•Standard3.3-V/5-Vto12-VConversionTYPICALAPPLICATION1Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.PRODUCTIONDATAinformationiscurrentasofpublicationdate.Copyright©2002–2010,TexasInstrumentsIncorporatedProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.Productionprocessingdoesnotnecessarilyincludetestingofallparameters.++-RSLatchLogicSRGateDriver_CurrentLimitPowerMOSFETN-ChannelRSENSESoftStart6μsMaxOnTimeVREF=1.233VErrorComparator400nsMinOffTimeUnderVoltageLockoutBiasSupplyVINFBENGNDSWTPS61040TPS61041SLVS413F–OCTOBER2002–REVISEDDECEMBER2010(1)SWITCHCURRENTPACKAGETAPARTNUMBER(2)PACKAGELIMIT,mAMARKINGTPS61040DBV400SOT23-5PHOITPS61040DDC400TSOT23-5QXK–40°CtoTPS61041DBV250SOT23-5PHPI85°CTPS61040DRV400SON-62×2CCLTPS61041DRV250SON-62×2CAW(1)Forthemostcurrentpackageandorderinginformation,seethePackageOptionAddendumattheendofthisdocument,orseetheTIwebsiteat(2)Thedevicesareavailableintapeandreelandintubes.AddRsuffixtothepartnumber(e.g.,TPS61040DRVR)toorderquantitiesof3000partsintapeandreeloraddsuffixT(e.g.,TPS61040DRVT)toorderatubewith250pieces..FUNCTIONALBLOCKDIAGRAM2SubmitDocumentationFeedbackCopyright©2002–2010,TexasInstrumentsIncorporatedProductFolderLink(s):TPS61040TPS61041Ipeak(typ)ILIMVINL
100nsIpeak(typ)400mAVINL
100nsfortheTPS61040Ipeak(typ)250mAVINL
100nsfortheTPS61041TPS61040TPS61041–OCTOBER2002–REVISEDDECEMBER2010Table2.TerminalFunctionsTERMINALI/ODESCRIPTIONDDC,NAMEDRVNO.DBVNO.Thisistheenablepinofthedevice.PullingthispintogroundforcesthedeviceintoshutdownEN43Imodereducingthesupplycurrenttolessthan1mA.Thispinshouldnotbeleftfloatingandneedstobeterminated.Thisisthefeedbackpinofthedevice.ConnectthispintotheexternalvoltagedividertoprogramFB34Ithedesiredoutputvoltage.GND21–GroundNC–5–NoconnectionConnecttheinductorandtheSchottkydiodetothispin.ThisistheswitchpinandisconnectedtoSW16IthedrainoftheinternalpowerMOSFET.VIN52ISupplyvoltagepinDETAILEDDESCRIPTIONOPERATIONTheTPS61040/41operateswithaninputvoltagerangeof1.8Vto6Vandcangenerateoutputvoltagesupto28V.Thedeviceoperatesinapulse-frequency-modulation(PFM)schemewithconstantpeakcurrentcontrol.Thiscontrolschememaintainshighefficiencyovertheentireloadcurrentrange,andwithaswitchingfrequencyupto1MHz,thedeviceenablestheuseofverysmallexternalcomponents.Theconvertermonitorstheoutputvoltage,andassoonasthefeedbackvoltagefallsbelowthereferencevoltageoftypically1.233V,theinternalswitchturnsonandthecurrentrampsup.Theswitchturnsoffassoonastheinductorcurrentreachestheinternallysetpeakcurrentoftypically400mA(TPS61040)or250mA(TPS61041).SeethePeakCurrentControlsectionformoreinformation.Thesecondcriteriathatturnsofftheswitchisthemaximumon-timeof6ms(typical).Thisisjusttolimitthem