This part is a kind of semiconductor called AS1138.

Function of this product has 30W PoE PD and DC-DC Controller.

Manufacturers : Akros Silicon

Image and pinout :

Some of the text within the PDF file :

AS1138 30W PoE PD and DC-DC Controller GENERAL DESCRIPTION The AS1138 is a single-chip, highly integrated CMOS solution for Power over Ethernet (PoE) Powered Devices requiring input power of up to 30Watts. Applications include Voice over IP (VoIP) Phones, Wireless LAN Access Point, Security Cameras, WiMAX Terminals, Point-of-Sales Terminals, RFID Readers, Thin Clients and Notebook computers. The AS1138 integrates input surge protection, a PD controller and a low-emission DC-DC controller. The AS1138 implements all of the physical layer Powered Device (PD) functionality, as required by IEEE® 802.3af-2005 and IEEE® 802.3at-2009 standards. This includes 2-event classification, Type 2 PSE detection indicator (ATDET), PD detection, under-voltage lock out (UVLO), and HotSwap FET integrati [ ... ]

AS1138 PDF Datasheet Download