Well, it could be a fixed linear reg or an adjustable one. Adjustables generally have a coupel resistors sitting next to it.
Look up any generic LDO from National, Linear, NXp, etc in SOT-89 package.
Best to check while running with a meter.
Pinning could be: GND, Vin, Vout but could just as well be several other combos (quite annoying)