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BQ24196电池电压和系统电压

Other Parts Discussed in Thread: BQ24196

1)BAT电压低于3.5V时,SYS电压维持不变,此时BQ24196如何实现升压的呢?

2)charge disable,BAT电压高于3.5V时,SYS电压随着BAT升高,是如何实现的呢?

3)charge enable,BAT电压高于3.5V时,SYS电压随着BAT上升,然后突然回落,再上升,这是怎么回事呢?