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BQ40Z50-R2: BQ40Z系列电路图中VCC pin必须要接到CFET和DFET的Drain吗?

Part Number: BQ40Z50-R2


请教下,像TI BQ40Z系列的原理图中,电量计IC的VCC pin(Secondary power supply input)都是接到CFET和DFET的Drain,我们在评估一颗CSP封装的MOS,但这颗MOS没有Drain引出,不知道VCC pin可以接到哪里,是必须要接到Drain吗?可不可以接到PACK+,如果接到PACK+,会不会有什么风险,谢谢。