The chip in question is a buck (step-down) switching regulator in a SOIC8 package, and there are many chips that fit this description. I can't tell you much more just from looking at the picture.
Chip uses an external inductor (big gray thing) on the output side to drop the voltage, along side some capacitors (medium sized brown things) that smooth out the input and output voltage spikes.
Then there are some small resistors (black things) that are probably used to set the output voltage of the regulator and capacitors probably there just because the datasheet specifies them.
You could try to reverse engineer the pinout from the board, which should be a step closer to identifying a suitable replacement part.
An example of a switching regulator that could potentially (but likely can't in this specific board) be used in said application would be something like this:
http://www.farnell.com/datasheets/1837055.pdf