It cannot be either the PAM2301/AME5110, this is because those are switching regulators and there are no inductors on that board's top. Secondly the fact that there SMD codes are BA*** or BAR** respectively which does not match your model.
It is possible that it is RT9193 5 volt LDO regulator from richtek. This is as its code is BA, the LG is the lot code. And it is obvious it is the 5v version because of your VCC reading.
The manual is here, this is found on s-manuals where there is a table of smd codes linking to datasheets where you can look for the respective component, this works as you can look for the respective component according to functionality.