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ADIADP125低静态电流线性电源解决方案关键词：电源管理,DC/DC转换器,线性电源,LDOADI公司的ADP125是5.5V输入500mA输出电流的低静态电流CMOS线性电源稳压器,输入电压从2.3V到5.5V,500A电流时的压降为130mV,有固定输出和可调输出两种型号,可调输出从0.8V到5.0V,100kHz的PSRR为60dB，主要用在数码相机和音频设备，手持设备，自动读表(AMR),GPS和本地管理单元，医疗设备和POL．本文介绍了ADP125主要特性，ADP124/ADP125方框图，应用电路以及ADP124/ADP125评估板电路图和材料清单．5.5VInput,500mA,LowQuiescentCurrent,CMOSLinearRegulatorsTheADP124/ADP125arelowquiescentcurrent,lowdropoutlinearregulators.Theyaredesignedtooperatefromaninputvoltagebetween2.3Vand5.5Vandtoprovideupto500mAofoutputcurrent.Thelow130mVdropoutvoltageata500mAloadimprovesefficiencyandallowsoperationoverawideinputvoltagerange.Thelow210μAofquiescentcurrentwitha500mAloadmakestheADP124/ADP125idealforbattery-operatedportableequipment.TheADP124iscapableof31fixed-outputvoltagesfrom1.75Vto3.3V.TheADP125istheadjustableversionofthedeviceandallowstheoutputvoltagetobesetbetween0.8Vand5.0Vbyanexternalvoltagedivider.TheADP124/ADP125arespecificallydesignedforstableoperationwithtiny1μFceramicinputandoutputcapacitorstomeettherequirementsofhighperformance,spaceconstrainedapplications.TheADP124/ADP125haveaninternalsoftstartthatgivesaconstantstart-uptimeof350μs.Short-circuitprotectionandthermaloverloadprotectioncircuitspreventdamageinadverseconditions.TheADP124/ADP125areavailablein8-leadexposedpaddleMSOPandLFCSPpackages.WhencomparedwiththestandardMSOPandLFCSPpackages,theexposedpaddleMSOPandLFCSPpackageshavelowerthermalresistance(θJA).ThelowerthermalresistancepackageallowstheADP124/ADP125tomeettheneedsofavarietyofportableapplicationswhileminimizingtheriseinjunctiontemperature.ADP125主要特性:Inputvoltagesupplyrange:2.3Vto5.5V500mAmaximumoutputcurrentFixedandadjustableoutputvoltageversions1%initialaccuracyUpto31fixed-outputvoltageoptionsavailablefrom1.75Vto3.3VAdjustable-outputvoltagerangefrom0.8Vto5.0VVerylowdropoutvoltage:130mVLowquiescentcurrent:45μALowshutdowncurrent:1μAExcellentPSRRperformance:60dBat100kHzExcellentload/linetransientresponseOptimizedforsmall1.0μFceramiccapacitorsCurrentlimitandthermaloverloadprotectionLogiccontrolledenableCompact8-leadexposedpaddleMSOPandLFCSPpackagesADP125应用:DigitalcameraandaudiodevicesPortableandbattery-poweredequipmentAutomaticmeterreading(AMR)metersGPSandlocationmanagementunitsMedicalinstrumentationPointofloadpower图1.ADP124内部方框图(固定输出)图2.ADP125内部方框图(可调输出)ADP124/ADP125评估板评估板主要特性:Inputvoltagerange:2.3Vto5.5VOutputcurrentrange:0mAto500mAOutputvoltageaccuracy:±1%AO-Electronics傲壹电子官网：中文网：−40℃to+125℃图3.ADP124/ADP125评估板电路图:LFCSP图4.ADP125评估板电路图:MSOP图5.ADP124评估板电路图:MSOP评估板材料清单(BOM):图6.ADP124/ADP125评估板PCB布局图:LFCSP