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 4V 9V。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 > App Notes > AUTOMOTIVE POWER-SUPPLY CIRCUITS Keywords: USB, Universal Serial Bus, step-up step-down, SEPIC, buck-boost, DC-DC controller, boost Aug 06, 2002 controller, DC to DC APPLICATION NOTE 1161 Current Limited DC-DC Controller Used as Step-Up Step-Down SEPIC Power Supply for USB Devices Abstract: USB powered devices require a regulated supply. Unfortunately, the USB bus voltage can vary from 4V to 9V. Configuring the MAX668 boost controller into step-up/step-down topology can generate a current- limited regulated supply. Universal Serial Bus (USB) is a popular way to connect PCs and consumer devices. It is simple and inexpensive and can connect multiple external peripherals simultaneously. As mobile devices add more functionality such as text messaging, web surfin……