This part is a kind of semiconductor called 8050SD.

Function of this product has SI-08050SD.

Manufacturers : Sanken electric

Image and pinout :

Some of the text within the PDF file :

1-1-2 Switching Mode Regulator ICs SI-8000SD Series ■Features • Surface-mount package (TO263-5) • Output current: 3.0A Surface Mount, Separate Excitation Step-down Switching Mode Regulator ICs ■Lineup Part Number VO (V) IO (A) SI-8033SD 3.3 3 SI-8050SD 5.0 • High efficiency: 79% typ. (SI-8033SD), 84% typ. (SI-8050SD) • Requires only 4 discrete external components • Internally-adjusted phase correction and output voltage • Built-in reference oscillator (60kHz) • Built-in overcurrent and thermal protection circuits • Output ON/OFF available • Soft start available by S.S pin ■Absolute Maximum Ratings Parameter DC Input Voltage Power Dissipation*2 Junction Temperature Storage Temperature Thermal Resistance (Junction to Case) Thermal Resistance (Junction to Ambient A [ ... ]

8050SD PDF Datasheet Download