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做个3.5V电源用什么芯片

Other Parts Discussed in Thread: LP38798

做3个电源,输入8.2v-8.4v ,输出分别为3.5v   4.2v    5v     ,输出电流大概几百mA。求芯片选型。

 

另外还需要一个输出-0.8v-0v的负电源芯片  ,求选型。