This part is a kind of semiconductor called AX1212.

Function of this product has 1.2V Output - 1A Low Dropout Linear Regulator.

Manufacturers : Axelite

Image and pinout :

Some of the text within the PDF file :

1.2V Output - 1A Low Dropout Linear Regulator AX1212 1.2V Output - 1A Low Dropout Linear Regulator „ Features - Fixed 1.2V + 2% output voltage - 1.4V maximum dropout at full load current - Fast transient response - Output current limiting - Built-in thermal shutdown - Good noise rejection - Pb-Free Packages: SOT223, TO252, „ Applications - PC peripheral - Communication „ General Description AX1212 is a low dropout positive 1.2V output regulator with minimum of 1A output current capability. The product is specifically designed to provide well-regulated supply for low voltage IC applications. AX1212 is also well suited for other applications such as VGA cards. AX1212 is guaranteed to have lower than 1.4V dropout at full load current making it ideal to provide well- [ ... ]

AX1212 PDF Datasheet Download