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BQ25895 Vsys无法保持最低电压

Other Parts Discussed in Thread: BQ25895

我在使用BQ25895时,2A充电和PMID升压功能都正常,但是在电池供电时 ,如果电池电压低于sys_min,Vsys无法保持最低电压sys_min,REGN无电压输出,Vsys随着电池电压降低而降低。

确认升压已开启。

是LDO没有工作么?

  • The bq25895 was designed to turn off the BATFET if V(BAT) drops below BATLOWV as a redundant over-discharge protection feature. That condition was erroneously omitted from the datasheet.
  • Hello , BATLOW是电池低点保护电压吧,但是我的Vbatlow < Vbat < Vsys。

    Vsys引脚电压跟随Vbat,无法维持设定的最小Vsys。

    Vsys有电压,BATFET(Q4)应该是打开的才对吧。


    在电池供电状态如何才能满足LDO开启条件,如果LDO没有开启,REGN无电压,ADC都不工作,外部温度采集TS也不能工作。