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LT3757 Datasheet(PDF) 1 Page - Linear Technology |
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LT3757 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 36 page  LT3757 3757fb n Wide Input Voltage Range: 2.9V to 40V n Positive or Negative Output Voltage Programming with a Single Feedback Pin n CurrentModeControlProvidesExcellentTransient Response n ProgrammableOperatingFrequency(100kHzto 1MHz)withOneExternalResistor n SynchronizabletoanExternalClock n LowShutdownCurrent<1µA n Internal7.2VLowDropoutVoltageRegulator n ProgrammableInputUndervoltageLockoutwith Hysteresis n ProgrammableSoft-Start n Small10-LeadDFN(3mm ×3mm)andThermally Enhanced10-PinMSOPPackages Typical applicaTion DescripTion Boost, Flyback, SEPIC and Inverting Controller TheLT®3757isawideinputrange,currentmode,DC/DC controllerwhichiscapableofgeneratingeitherpositiveor negativeoutputvoltages.Itcanbeconfiguredaseithera boost,flyback,SEPICorinvertingconverter.TheLT3757 drivesalowsideexternalN-channelpowerMOSFETfrom aninternalregulated7.2Vsupply.Thefixedfrequency, current-modearchitectureresultsinstableoperationover awiderangeofsupplyandoutputvoltages. TheoperatingfrequencyofLT3757canbesetwithan externalresistorovera100kHzto1MHzrange,andcan besynchronizedtoanexternalclockusingtheSYNCpin. Alowminimumoperatingsupplyvoltageof2.9V,anda lowshutdownquiescentcurrentoflessthan1µA,make theLT3757ideallysuitedforbattery-operatedsystems. The LT3757 features soft-start and frequency foldback functions to limit inductor current during start-up and outputshort-circuit. High Efficiency Boost Converter FeaTures applicaTions n AutomotiveandIndustrialBoost,Flyback,SEPICand InvertingConverters n TelecomPowerSupplies n PortableElectronicEquipment Efficiency SENSE LT3757 VIN VIN 8V TO 16V 10µF 25V X5R VOUT 24V 2A 0.01 41.2k 300kHz GATE FBX GND INTVCC SHDN/UVLO SYNC RT SS VC 200k 43.2k 0.1µF 22k 6.8nF 10µH 3757 TA01a 226k 16.2k 4.7µF 10V X5R 10µF 25V X5R 47µF 35V 2 + OUTPUT CURRENT (A) 0.001 30 50 40 60 70 80 90 100 0.01 0.1 1 3757 TA01b 10 VIN = 8V VIN = 16V L ,LT,LTC,LTM,LinearTechnology,theLinearlogoandBurstModeareregisteredtrademarks andNoRSENSEandThinSOTaretrademarksofLinearTechnologyCorporation.Allother trademarksarethepropertyoftheirrespectiveowners. |
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