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数据手册7.3.1 Charge Pump Control有说明，在下面这种情况下两个MOS是不会打开的，您参考一下：
the C(VDDCP) is not scaled properly to support the number of FETs in parallel, the heavy loading would prevent the charge pump to ramp up above UVLO. CHG and DSG would not be turned on in this case.
