This part is a kind of semiconductor called PR4401.

Function of this product has (PR4401 / PR4402) 0.9V Boost Driver.

Manufacturers : PREMA

Image and pinout :

Some of the text within the PDF file :

LED DRIVER PR4401/PR4402 0.9V Boost Driver for White LEDs PR4401/4402 Requires Only One External Component The PR4401 and PR4402* are single cell step-up converters for white LEDs operating from a supply voltage of less than 0.9V. Only one external inductor is needed for operation of a white LED. PR4401 is recommended for mean LED currents of up to 20mA, PR4402 for up to 40mA. This makes PR4401 and PR4402 ideal for use in low-cost or small-sized applications such as LED flashlights or LCD backlighting for portable devices. Features • • • • minimum startup voltage 0.9V 200/250mA peak output current only one external component required battery deep discharge protection Applications • Small-sized LED torches • LCD backlighting • LED indicator lights Typical Application Vbat [ ... ]

PR4401 PDF Datasheet Download