一种双端USB电源开关电路的设计

Design of a Dual Port USB Power Switch

介绍了一种用 CMOS工艺实现的双端 USB电源开关控制电路 ,着重阐述了电路内部自动进行工作电压欠压检测控制、过热和过流限制等一系列保护调整电路的工作原理及实现方法 ,并对一个用于建立内部参考电压的带隙 (Band- gap)基准源进行了分析。在版图设计中 ,提出了一种优化的具有超低导通电阻的开关控制管拓扑结构。计算机模拟表明 ,整个设计获得了预期的结果。

A dual port USB power switch based on CMOS process is presented, which consists of the undervoltage lock out, overheat/overcurrent protection, etc.A band gap reference for 1 2 V built in voltage reference and an optimized topology of the power switch with a maximum on resistance of 95 mΩ ( V IN =5 0 V) are designed.These well conceived circuits provide anticipated results