This part is a kind of semiconductor called MP9141.

Function of this product has Monolithic step-down switch mode converter.

Manufacturers : HUAFUQIN ELECTRONICS

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Some of the text within the PDF file :

SHENZHEN HUAFUQIN ELECTRONICS CO.,LTD MP9141 DESCRIPTION The MP9141 is a monolithic step-down switch mode converter with a built in internal power MOSFET. It achieves 2A continuous output current over a wide input supply range with excellent load and line regulation. TheMP9141requires a minimum number of readily available standard external components. Current mode operation provides fast transient response and eases loop stabilization. Fault condition protection includes cycle-bycycle current limiting and thermal shutdown. In shutdown mode the regulator draws 25µA of supply current. FEATURES • 2A Output Current • 0.22Ω Internal Power MOSFET Switch • Stable with Low ESR Output Ceramic Capacitors • Up to 95% Efficiency • 25µA Shutdown Mode • Fixed 450KHz Frequency • Ther [ ... ]

MP9141 PDF Datasheet Download