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求一款无欠压闭锁的buck芯片,输出电压9v左右,电流1a以上



需要一款buck芯片,Vin > 8v 时  Vout = 8v,

                                   Vin <=8v 时  Vout = Vin.

9v左右均可以,效率尽可能高。

谢谢帮助