LT3758

LT375813758fnWideInputVoltageRange:5.5Vto100VnPositiveorNegativeOutputVoltageProgrammingwithaSingleFeedbackPinnCurrentModeControlProvidesExcellentTransientResponsenProgrammableOperatingFrequency(100kHzto1MHz)withOneExternalResistornSynchronizeabletoanExternalClocknOutputOvervoltageProtectionnLowShutdownCurrent1μAnInternal7.2VLowDropoutVoltageRegulatornProgrammableInputUndervoltageLockoutwithHysteresisnProgrammableSoft-StartnSmall10-LeadDFN(3mm×3mm)andMSOPEPackagesTYPICALAPPLICATIONDESCRIPTIONHighInputVoltage,Boost,Flyback,SEPICandInvertingControllerTheLT®3758isawideinputrange,currentmode,DC/DCcontrollerwhichiscapableofgeneratingeitherpositiveornegativeoutputvoltages.Itcanbeconfiguredaseitheraboost,flyback,SEPICorinvertingconverter.TheLT3758drivesalowsideexternalN-channelpowerMOSFETfromaninternalregulated7.2Vsupply.Thefixedfrequency,current-modearchitectureresultsinstableoperationoverawiderangeofsupplyandoutputvoltages.TheoperatingfrequencyofLT3758canbesetwithanexternalresistorovera100kHzto1MHzrange,andcanbesynchronizedtoanexternalclockusingtheSYNCpin.Aminimumoperatingsupplyvoltageof5.5V,andalowshutdownquiescentcurrentoflessthan1μA,maketheLT3758ideallysuitedforbattery-poweredsystems.TheLT3758featuressoft-startandfrequencyfoldbackfunctionstolimitinductorcurrentduringstart-upandoutputshort-circuit.Thedeviceisavailableinasmall10-leadDFN(3mm×3mm)orMSOPEpackage.12VOutputNonisolatedFlybackPowerSupplyFEATURESAPPLICATIONSnAutomotivenTelecomnIndustrialSENSELT3758VINDSNVIN36VTO72VCIN2.2μF100VX7R63.4k200kHzGATEFBXGNDINTVCCSHDN/UVLOSYNCRTSSVC0.022μF100VT11,2,3(SERIES)4,5,6(PARALLEL)1M44.2k0.47μF100pF10k10nF0.030Ω15.8k1%105k1%CVCC4.7μF10VX5RVOUT12V1.2A3758TA01COUT47μFX5R6.2kD1SWM15.1Ω1N4148L,LT,LTC,LTM,LinearTechnologyandtheLinearlogoareregisteredtrademarksofLinearTechnologyCorporation.Allothertrademarksarethepropertyoftheirrespectiveowners.Patentspending.LT375823758fPINCONFIGURATIONABSOLUTEMAXIMUMRATINGSVIN,SHDN/UVLO.....................................................100VINTVCC....................................................VIN+0.3V,20VGATE.........................................................INTVCC+0.3VSYNC..........................................................................8VVC,SS.........................................................................3VRT...............................................................................................1.5V(Note1)TOPVIEWDDPACKAGE10-LEAD(3mms3mm)PLASTICDFN1096784511321VINSHDN/UVLOINTVCCGATESENSEVCFBXSSRTSYNCTJMAX=125°C,θJA=43°C/WEXPOSEDPAD(PIN11)ISGND,MUSTBESOLDEREDTOPCB12345VCFBXSSRTSYNC109876VINSHDN/UVLOINTVCCGATESENSETOPVIEWMSEPACKAGE10-LEADPLASTICMSOP11TJMAX=125°C,θJA=40°C/WEXPOSEDPAD(PIN11)ISGND,MUSTBESOLDEREDTOPCBORDERINFORMATIONLEADFREEFINISHTAPEANDREELPARTMARKING*PACKAGEDESCRIPTIONTEMPERATURERANGELT3758EDD#PBFLT3758EDD#TRPBFLDNK10-Lead(3mm×3mm)PlasticDFN–40°Cto125°CLT3758IDD#PBFLT3758IDD#TRPBFLDNK10-Lead(3mm×3mm)PlasticDFN–40°Cto125°CLT3758EMSE#PBFLT3758EMSE#TRPBFLTDNM10-Lead(3mm×3mm)PlasticMSOP–40°Cto125°CLT3758IMSE#PBFLT3758IMSE#TRPBFLTDNM10-Lead(3mm×3mm)PlasticMSOP–40°Cto125°CConsultLTCMarketingforpartsspecifiedwithwideroperatingtemperatureranges.*Thetemperaturegradeisidentifiedbyalabelontheshippingcontainer.Formoreinformationonleadfreepartmarking,goto:fications,goto:±0.3VFBX.................................................................–6Vto6VOperatingTemperatureRange(Note2).............................................–40°Cto125°CMaximumJunctionTemperature...........................125°CStorageTemperatureRange...................–65°Cto125°CLT375833758fELECTRICALCHARACTERISTICSTheldenotesthespecificationswhichapplyoverthefulloperatingtemp-eraturerange,otherwisespecificationsareatTA=25°C.VIN=24V,SHDN/UVLO=24V,SENSE=0V,unlessotherwisenoted.PARAMETERCONDITIONSMINTYPMAXUNITSVINOperatingRange5.5100VVINShutdownIQSHDN/UVLO=0VSHDN/UVLO=1.15V0.116μAμAVINOperatingIQVC=0.3V,RT=41.2k1.62.2mAVINOperatingIQwithInternalLDODisabledVC=0.3V,RT=41.2k,INTVCC=7.5V350400μASENSECurrentLimitThresholdl100110120mVSENSEInputBiasCurrentCurrentOutofPin–65μAErrorAmplifierFBXRegulationVoltage(VFBX(REG))FBX0V(Note3)FBX0V(Note3)ll1.569–0.8161.6–0.8001.631–0.784VVFBXOvervoltageLockoutFBX0V(Note4)FBX0V(Note4)678111014%%FBXPinInputCurrentFBX=1.6V(Note3)FBX=–0.8V(Note3)–107010010nAnATransconductancegm(ΔIVC/ΔFBX)(Note3)230μSVCOutputImpedance(Note3)5MΩVFBXLineRegulation(ΔVFBX/[ΔVIN•VFBX(REG)])FBX0V,5.5VVIN100V(Notes3,6)FBX0V,5.5VVIN100V(Notes3,6)0.0060.0050.0250.03%/V%/VVCCurrentModeGain(ΔVVC/ΔVSENSE)5.5V/VVCSourceCurrentVC=1.5V–15μAVCSinkCurrentFBX=1.7VFBX=–0.85V1211μAμAOscillatorSwitchingFrequencyRT=41.2ktoGND,FBX=1.6VRT=140ktoGND,FBX=1.6VRT=10.5ktoGND,FBX=1.6V2703001001000330kHzkHzkHzRTVoltageFBX=1.6V1.2VMinimumOff-Time220nsMinimumOn-Time220nsSYNCInputLow0.4SYNCInputHigh1.5SSPull-UpCurrentSS=0V,CurrentOutofPin