摘要：USB供电设备需要受规管的供应。不幸的是，USB总线电压可以因4V9V。将MAX668升压控制器配置到步上/步落拓扑可以生成电流限制受规管的供应。Maxim>AppNotes>AUTOMOTIVEPOWER-SUPPLYCIRCUITSKeywords:USB,UniversalSerialBus,step-upstep-down,SEPIC,buck-boost,DC-DCcontroller,boostAug06,2002controller,DCtoDCAPPLICATIONNOTE1161CurrentLimitedDC-DCControllerUsedasStep-UpStep-DownSEPICPowerSupplyforUSBDevicesAbstract:USBpowereddevicesrequirearegulatedsupply.Unfortunately,theUSBbusvoltagecanvaryfrom4Vto9V.ConfiguringtheMAX668boostcontrollerintostep-up/step-downtopologycangenerateacurrent-limitedregulatedsupply.UniversalSerialBus(USB)isapopularwaytoconnectPCsandconsumerdevices.Itissimpleandinexpensiveandcanconnectmultipleexternalperipheralssimultaneously.Asmobiledevicesaddmorefunctionalitysuchastextmessaging,websurfin
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