This part is a kind of semiconductor called AP1084K33LA.

Function of this product has 5A Low Dropout Positive Adjustable or Fixed-Mode Regulator.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

AP1084 5A Low Dropout Positive Adjustable or Fixed-Mode Regulator „ Features 1.4V maximum dropout at full load current Built-in thermal shutdown • Output current limiting • Adjustable output voltage or fixed 1.5V, 1.8V, 2.5V, 3.3V, 5.0V • Fast transient response • Good noise rejection • Package : TO252, TO263, TO220 • • „ General Description AP1084 is a low dropout positive adjustable or fixedmode regulator with minimum of 5.0A 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. AP1084 is also well suited for other applications such as VGA cards. AP1084 is guaranteed to have lower than 1.4V dropout at full load current making it [ ... ]

AP1084K33LA PDF Datasheet Download