This part is a kind of semiconductor called MP1540.

Function of this product has 18V Step-Up Converter.

Manufacturers : MPS

Image and pinout :

Some of the text within the PDF file :

TM MP1540 1.3MHz, 18V Step-Up Converter The Future of Analog IC Technology TM DESCRIPTION The MP1540 is a 5-pin thin TSOT23 current mode step-up converter intended for small, lo w power applications. The MP1540 switches a t 1.3MHz and allows the use of tiny, low cost capacitors and inductors 2mm or less in height. Internal soft-start results in small inr ush current and extends battery life. The MP1540 operates from an input voltage a s lo w as 2. 5V and can generate 1 2V at up t o 200mA f rom a 5 V supply. The MP1540 include s under voltage lockout, current limiting, an d thermal overload protection to prevent damage in the event of an output overload. T he MP1540 is available in a small 5-pin TSOT23 package. FEATURES • On Board Power MOSFET • Uses Tiny Capacitors and Inductors [ ... ]

MP1540 PDF Datasheet Download