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bq25700 ship mode

Other Parts Discussed in Thread: BQ25703A


在使用bq25700的过程中我们希望能把ship mode 这个功能用上,但是如果BATFET如果只是单颗P-MOS,即使进入ship mode 由于BATFET的体二极管也不能将系统端和电池端完全隔离开来,如果BATFET采用两颗背对背的P-MOS在进入ship mode的时候是可以将系统和电池完全隔离的。请问这样做是否合理?如果不可行,怎样才能使用bq25700的ship mode 功能呢?期待解答,谢谢。

  • In BQ2589X, the battery FET is bi-directional blocking. When the shipping mode is enable, there is no leakage current coming out of the battery. At the same time, a mA level discharging current (implemented by a current source) is applied on SYS to pull down the voltage quickly, in case no system load current.

    BQ25703A follows the similar implementation, only difference is the battery FET is only single directional blocking, so before enable BQ25703A ship mode, the host needs to turn off the pack internal blocking FETs first to make sure no leakage current coming out from the battery.
    BQ25700 is similar chip