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充电IC最大电流问题

Other Parts Discussed in Thread: BQ24296

请教一下,有的充电IC支持最大充电电流为3A(如24296M),有些最大充电电流可以支持2A(如SMB358)支持最大充电电流是由什么来决定?另外在CC阶段充电,Q4管子的阻抗会变化吗?谢谢