This part is a kind of semiconductor called STCC5021.

Function of this product has USB charging controller.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

STCC5011, STCC5021 USB charging controller with integrated power switch and attach detector Datasheet - production data VFQFPN 16L - 3 x 3 x 0.8 mm Applications • USB ports/hubs • Personal computers, all-in-one PCs • Monitors • Notebooks, ultrabooks • Tablet PCs • Universal wall charging adapters Features • Compliant with USB charging specifications BC1.2, USB 2.0 and USB 3.0 standards • Compliant with Chinese telecommunications industry standard YD/T 1591-2009 • Compatible with proprietary charging mode (Apple® 1 A / 2 A, BlackBerry®, Korean tablets) • Wide bandwidth, low-loss USB 2.0 data switch • Integrated VBUS power switch with low RON of 65 mΩ • Constant current mode overcurrent protection • Soft-start to limit inrush current • Adjustable current li [ ... ]

STCC5021 PDF Datasheet Download