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BQ76940内部LDO输入和输出电压问题

Other Parts Discussed in Thread: BQ78350

我这边用BQ7694000DBT +BQ78350做12串锂电池监测方案。BQ7694000DBT REGSRC引脚输入电压是16.4V,按手册说明,REGOUT引脚输出的应该是2.5V,但是实测输出3.1V。请问这是什么原因呢?而BQ78350电源电压VCC最大2.6V,这不就会烧坏BQ78350了吗?电路就是官方的推荐电路。请TI的工程师们帮忙解答一下困惑。