This part is a kind of semiconductor called AP4310A.

Function of this product has DUAL OP AMP AND VOLTAGE REFERENCE.

Manufacturers : Diodes

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Some of the text within the PDF file :

A Product Line of Diodes Incorporated AP4310A DUAL OP AMP AND VOLTAGE REFERENCE Description The AP4310A is a monolithic IC specifically designed to regulate the output current and voltage levels of switching battery chargers and power supplies The device contains two Op Amps and a 2.5V precision shunt voltage reference. Op Amp 1 is designed for voltage control with its noninverting input internally connected to the output of the shunt regulator. Op Amp 2 is for current control with both inputs uncommitted. The IC offers the power converter designer a control solution that features increased precision with a corresponding reduction in system complexity and cost. The AP4310A is available in SO-8 package. Pin Assignments (Top View) OUTPUT 1 1 INPUT 1- 2 INPUT 1+/VKA 3 GND 4 8 VCC 7 OUTPUT [ ... ]

AP4310A PDF Datasheet Download