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BQ24030 电池供电时输出电压不足

Other Parts Discussed in Thread: BQ24030

 使用BQ24030,当只有电池供电到时候,电池输入电压VCC3.6_BAT为4v,测得输出电压VCC3.6/5只有2.15v,无法满足后级电路的电压需求。在设计的时候查看用户手册,电池管脚到输出管脚的dropout最大应该只有100mv,就是说输出电压应该可以达到3.9v附近,为什么实测的输出电压偏差这么多?是不是我哪里理解有误?