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BQ25606低电池电压下SYS引脚电压输出不正常

Other Parts Discussed in Thread: BQ25606

请问下我用了BQ25606做电源管理,规格书上写的SYS电压最低到3.5V,不会再降低了,可是我再实际电路板上测量SYS引脚输出电压会比3.5V还低,不充电状态,SYS始终和电池电压差零点几伏,请问下这是什么情况?这个现象正常么?有没有什么方法可以把 SYS引脚的最低电压阈值卡在3.5V以上?