I would first look for a dedicated 2V6 regulator and second an LM317L. You will also need a level shifter I personally recommend the device mentioned in
NXP App note AN10441 (attached) as it is Bi Directional and will work to 2.5V easily... FORGET the IC level shifters most suffer from large size because of un needed I/O many are single direction and there are only a few ic's that will work. This recommended (Highly By ME) does work, I haven't used it at 2V6 (I have at 3V3) but the app note does state that it will. I would recommend BSS138 Mosfets for the device. You Must use the correct level shifter, a mistake here could be very bad for the device... BTW how expensive was it???
Doc
AN10441.pdf (52.4 KB)