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电压转换问题



求救啊!!!

我要做电压转换  1,将7.2v转换为5v

                              2.将5v转换为3.3v

                              3,.将3.3v转换为-3.3v

我们用那个LM2940,但是电源的纹波太大,都98mv了,但是我们要求的大概在10mv左右额,有没有什么好的芯片推荐啊,谢谢