ME2188效率高,同步PFM升压型DC-DC变换器

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1、ME2188HighEfficiency,synchronousPFMstep-upDC-DCconverterGeneralDescriptionFeaturesME2188SeriesisaPFMStep-upDC/DCHighefficiency：95%converterICwithlowsupplycurrentbyCMOSMaximumfrequency：350KHzprocess.HighfrequencynoisethatoccursduringLowQuiescentCurrent：13μAswitchingisreducedbyusingadvanc

2、edcircuitInputVoltage:0.9V~5.0Vdesigned,outputvoltageisprogrammablein0.1VOutputVoltageRange:1.8Vto5.0Vstepsbetween1.8V~5.0VandmaximumfrequencyHighAccuracy:±2%is350KHz(TYP.).Alowripple,highefficiencystep-upLowrippleandLownoiseDC/DCconvertercanbeconstructedofME2188XxxPackage:withonlytwo

3、externalcomponents.ME2188XxxisSOT23-3,SOT23-5，SOT23，SOT89-3，suitableforusewithbattery-poweredinstrumentsTO-92withlownoiseandlowsupplycurrent.SelectionGuideTypicalApplicationPowersourceforbattery-poweredequipmentPowersourceforWirelessmouse,toys,Cameras,VCRs,PDAs,MP3,andLedlightingetcTypic

4、alApplicationCircuitV03Page1of12ME2188PinConfigurationPinAssignmentSWITCHINGTYPEPOSTFIXPACKAGECEFUNCTIONFEATURESTRANSISTORXSOT23M3SOT23-3ME2188AxxBuildinTransistorNoLxPSOT89-3TTO92ME2188CxxM5SOT23-5BuildinTransistorYesLX+CEME2188AXXPinNumberPinNameDescriptionSOT89-3SOT23-3SOT23TO-921111GND

5、Ground2332VOUTVoltageoutput3223LXSwitchpinME2188CXXPINNumberPinNameDescriptionSOT23-51CEChipenable2VOUTOutputvoltagemonitor,ICinternalpowersupply3NCNC4GNDGround5LXSwitchV03Page2of12ME2188AbsoluteMaximumRatingsParameterSymbolRatingsUnitsSupplyVoltageVMAX8VLXpincurrentILXmax1000mASOT23PD300m

6、WContinuousTotalPowerDissipationSOT89PD500mWTO92PD500mWOperatingTemperatureRangeTOPR-20～＋85℃StorageTemperatureRangeTSTG-40~125℃ESDVESD2000VBlockDiagramV03Page3of12ME2188ElectricalCharacteristics0TA=25C,Vin=VOUT×0.6V,L=22μH，CIN=10μF，COUT=100μF,unlessotherwisenoted.ME2188Axx/CxxSymbolParamet

7、erTestConditionsMINTYPMAXUNITVOUTOutputVoltageVOUT×0.98VOUTVOUT×1.02VVINSupplyVoltage0.9-5VVSTARTStartvoltageIload=1mA，Vin：0→2V-0.851.1VVholdHoldvoltageIload=1mA，Vin：2→0V0.5--VFOSCoscillationfrequency-350-KHzηEfficiency-9095%IlimitCurrentlimit80010001200mAIINQ