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求助:12V转5V降压电路设计

Other Parts Discussed in Thread: TPS62173, TPS560200

要求:12V-5V降压电路设计,输出电压变化范围0.02V(20mV),输出电流200mA左右,小封装电路。请大神们介绍一款芯片或者设计方案,请尽量详细明了,谢谢。

注:电压要非常的稳,而且一定要在变化范围之内。