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关于BQ25895的OTG输出问题

Other Parts Discussed in Thread: BQ25895

我在使用BQ25895的buck和boost功能;

当CHARGE功能打开时启动BUCK;  VOTG=VBAT;

但是如果关闭CHARGE打开OTG时启动boost; VOTG=VBUS;

那么问题来了。。如果我把OTG接在5V的设备上,当启动MAXCHARGE时VBUS高达12V,会把接在OTG上的设备烧毁。

请教一下这个是怎么协调的呢?必须要外加MOSFET隔断吗?

先感谢各位大神。