This part is a kind of semiconductor called AX1117.

Function of this product has 1A Low Dropout Linear Regulator.

Manufacturers : AXElite

Image and pinout :

Some of the text within the PDF file :

AX1117 1A Low Dropout Linear Regulator  GENERAL DESCRIPTION AX1117 is a low dropout positive adjustable or fixed-mode regulator with minimum of 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 3.3V logic supply. AX1117 is also well suited for other applications such as VGA cards. AX1117 is guaranteed to have lower than 1.4V dropout at full load current making it ideal to provide well-regulated outputs of 1.25 to 5.0 with 6.4V to 12V input supply.  FEATURES 1.4V maximum dropout at full load current Fast transient response Output current limiting Built-in thermal shutdown Good noise rejection 3-Terminal Adjustable or Fixed 1.5V, 1.8V, 2.5V, 3.3V, 5.0V Pa [ ... ]

AX1117 PDF Datasheet Download