This part is a kind of semiconductor called D1067.

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

Manufacturers : DMS

Image and pinout :

Some of the text within the PDF file :

D1067 DESCRIPTION The DMS1067 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. The DMS1067 requires 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 420KHz Frequency • Thermal Shutdown • Cycle-by-Cycle Over [ ... ]

D1067 PDF Datasheet Download