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BQ25896: VSYS输出电压?

Part Number: BQ25896

看BQ25896datasheet中VSYS的输出电压范围是3.5V~4.5V,但是我们测试电池供电时,电池电压低于3.5V时,VSYS就和电池电压一样了,请问是什么原因呢?