Hi orjanh,
this was a switched mode regulator chip. It may be that the other components (flah chips, controller) are damaged, too. Normally these regulators are proof against nearly everything.
The easiest way is to g..gle the datasheet of the memory chips and look for the recomended supply voltage. Look for the power consumption, too. Then look for a chip wich has an input
of (I think 5V) wich can make this. It may cost one to 2€ . Assemble it, and try ...
Good luck
EMUD