SMD SOT-25 identify component
I have looked around, and found also your forum post on a elektroda.pl. But looking further on this website with code bP and looking through the few ones with package SOT25/SOT3353 I think the correct component is RT9193. Especially because there is a coil connected to pin 4 or pin 5, my first guess was that it is some kind of voltage regulator.
Datasheet