This part is a kind of semiconductor called AP1122.

Function of this product has 1A LOW DROPOUT POSITIVE REGULATOR.

Manufacturers : Diodes Incorporated

Image and pinout :

Some of the text within the PDF file :

AP1122 1A LOW DROPOUT POSITIVE REGULATOR Features • • • • • • • • • 1.3V maximum dropout at full load current Fixed 1.2V±2% output voltage Fast transient response Output current limiting Built-in thermal shutdown Good noise rejection Packages: SOT223-3L, TO252-3L, SOT89-3L SOT223-3L and TO252-3L: Available in “Green” Molding Compound (No Br, Sb) (Note 1) Lead Free Finish/RoHS Compliant (Note 2) General Description AP1122 is a low dropout positive fixed-mode regulator with 1A output current capability. The product is specifically designed to provide well-regulated supply for low voltage IC applications such as high-speed bus termination and low current 1.2V logic supply. AP1122 is also well suited for other applications such as VGA cards. AP1122 is guaranteed to hav [ ... ]

AP1122 PDF Datasheet Download