usbotg 需要实现本地主机对u盘之类的5v供电(本地电池dcdc到5v),另外在主机接电脑时,又需要电脑对主机的电池充电(也就是BQ24072的5v输入)。 请看下面的图,这个双向开关不好选择,本来想在两个x的地方放置功率mos管,但是这两种情况下都有反向5v电压加在截止的那个管子上。不知道ti有什么芯片可以完成这样的功能?
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