This part is a kind of semiconductor called 5019MTC.

Function of this product has FAN5019MTC.

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

www.fairchildsemi.com FAN5019 6-Bit VID Controller 2-4 Phase VRM10.X Controller Features • Pin and Function Backward Compatible with FAN53168 and FAN53180 Controllers • Precision Multi-Phase DC-DC Core Voltage Regulation – ±10mV Output Voltage Accuracy Over Temperature • Differential Remote Voltage Sensing • Selectable 2, 3, or 4 Phase Operation • Selectable VRM9 or VRM10 Operation • Up to 1MHz per Phase Operation (4MHz ripple Frequency) • Lossless Inductor Current Sensing for Loadline Compensation – External Temperature Compensation • Accurate Load-Line Programming (Meets Intel® VRM/VRD10.0 and 10.X CPU Specifications) • Accurate Channel-Current Balancing for Thermal Optimization and Layout Compensation • Convenient 12V Supply Biasing • 6-bit Voltage Identi�� [ ... ]

5019MTC PDF Datasheet Download