LTC3441 - 大电流微功率同步降压-升压型 DC-DC 转换器 LTC3441EDE.pdf

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1、LTC3441HighCurrentMicropowerSynchronousBuck-BoostDC/DCConverterUFEATURESDESCRIPTIO■RegulatedOutputwithInputAbove,BeloworEqualTheLTC®3441isahighefficiency,fixedfrequency,buck-totheOutputboostDC/DCconverterthatoperatesefficientlyfrominput■SingleInductor,NoSchottkyDiodesvoltages

2、above,beloworequaltotheoutputvoltage.The■HighEfficiency:Upto95%topologyincorporatedintheICprovidesacontinuoustrans-■®25µAQuiescentCurrentinBurstModeOperationferfunctionthroughalloperatingmodes,makingtheprod-■Upto1.2AContinuousOutputCurrentfromaSingleuctidealforsinglelithiumio

3、normulticellapplicationswhereLithium-Iontheoutputvoltageiswithinthebatteryvoltagerange.■TrueOutputDisconnectinShutdownThedeviceincludestwo0.10ΩN-channelMOSFET■2.4Vto5.5VInputRangeswitchesandtwo0.11ΩP-channelswitches.External■2.4Vto5.25VOutputRangeSchottkydiodesareoptional,and

4、canbeusedfora■1MHzFixedFrequencyOperationmoderateefficiencyimprovement.Theoperatingfrequency■SynchronizableOscillatorisinternallysetto1MHzandcanbesynchronizedupto■SelectableBurstModeorFixedFrequencyOperation1.7MHz.Quiescentcurrentisonly25µAinBurstMode■<1µAQuiescentCurrentinSh

5、utdownoperation,maximizingbatterylifeinportableapplications.■Small,ThermallyEnhanced12-Lead(4mm×3mm)BurstModeoperationisusercontrolledandcanbeDFNpackageenabledbydrivingtheMODE/SYNCpinhigh.IftheMODE/UAPPLICATIOSSYNCpinisdrivenloworwithaclock,thenfixedfre-quencyswitchingisenabl

6、ed.■HandheldComputersOtherfeaturesincludea1µAshutdown,soft-startcontrol,■HandheldInstrumentsthermalshutdownandcurrentlimit.TheLTC3441is■MP3Playersavailableinathermallyenhanced12-lead(4mm×3mm)■DigitalCamerasDFNpackage.,LTCandLTareregisteredtrademarksofLinearTechnologyCorporati

7、on.BurstModeisaregisteredtrademarkofLinearTechnologyCorporation.UTYPICALAPPLICATIOEfficiencyvsVINLi-Ionto3.3Vat1ABuck-BoostConverter100VOUT=3.3VIOUT=200mAL1954.7µHVOUT3.3V901A8545SW1SW2IOUT=1A340k9880PVINVOUT2.5VTO4.2V101275LTC3441VINFBCOUT11115k22µF70SHDN/SSVCEFFICIENCY(%)72

8、65Li-Ion*MODE/SYNCGND1.5nFCIN36200k6010µFPGNDPGND5550*1=BurstModeOPE