This part is a kind of semiconductor called MP3398A.
Function of this product has White LED Controller.
Manufacturers : MPS
Image and pinout :
Some of the text within the PDF file :
The Future of Analog IC Technology MP3398A Step up, 4 strings, Max. 350mA/string Analog and PWM dimming, White LED Controller DESCRIPTION The MP3398A is a step-up controller with 4 current channels, which is designed to drive WLED arrays for large-size LCD-panel backlighting applications. It is flexible to expand the number of LED channels by two or more ICs in parallel sharing a single inductive power source. The MP3398A uses peak-current mode with fixed switching frequency. The frequency is programmable by an external setting resistor. The MP3398A drives an external MOSFET to boost up the output voltage from a 5V to 28V input supply. It regulates the current in each LED string to the value set by an external current-setting resistor. The MP3398A applies 4 internal current sources for c [ ... ]