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BQ24100: datasheet中的齐纳二极管选型

Part Number: BQ24100

我看到datasheet中针对BQ24100需要在Vout和PGND之间增加一个齐纳二极管,但是手册里面这个二极管是双路的,

请问下如果用MMBZ18VALT1z这个料,是否需要将两路tvs都并联接在Vout和PGND之间,还是说用一路就行了?

然后 MMBZ18VALT1z这个料体积比较大,如果换用其他体积更小的物料,需要满足一些什么要求?