This part is a kind of semiconductor called EUP3482.

Function of this product has 340KHz Synchronous Step-Down Converter.

Manufacturers : Eutech Microelectronics

Image and pinout :

Some of the text within the PDF file :

EUP3482 2A, 30V, 340KHz Synchronous Step-Down Converter DESCRIPTION The EUP3482 is a synchronous current mode buck regulator capable of driving 2A continuous load current with excellent line and load regulation. The EUP3482 can operate with an input range 4.5V to 30V and the output can be externally set from 0.923V to 20V with a resistor divider. Fault condition protection includes cycle-by-cycle current limiting and thermal shutdown. In shutdown mode the regulator draws 1µA of supply current. Programmable soft-start minimizes the inrush supply current and the output overshoot at initial startup. The EUP3482 require a minimum number of external components. FEATURES 2A Output Current 220ns Minimum On Time 35V Input Surge Protection Integrated 160mΩ/110mΩ DMOS Switches 4.5V to 30V Inpu [ ... ]

EUP3482 PDF Datasheet Download