简单的电路断开负载

摘要：本应用笔记介绍了外部功率MOSFET作为负载断开开关行为，并允许重物和低输入电压开关稳压器启动。负载断开电路提高一个单一的镍氢电池的输出为3.3V，并提供600mA的输出电流。的MAX1703升压型DC-DC转换器的设计特色。

Maxim>AppNotes>BatteryManagementPower-SupplyCircuitsKeywords:loaddisconnect,step-upregulator,boostconverter,NniMHoutput,regulatorfeedbackstep-upDC-DCconverterJun19,2000APPLICATIONNOTE657SimpleCircuitDisconnectsLoadAbstract:ThisapplicationnoteshowshowanexternalpowerMOSFETactsasaload-disconnectswitchandallowsaswitchingregulatortostartupwithheavyloadsandlow-inputvoltages.Theload-disconnectcircuitboostsasingleNiMHcelloutputto3.3Vanddeliversoutputcurrentsto600mA.TheMAX1703step-upDC-DCconverterisfeaturedinthedesign.Placingaload-disconnectcircuitontheoutputofabootstrappedstep-upregulatorallowstheregulatortostartwithloadcurrentsmuchhigherthanwouldotherwisebeposs