Looking single CR123 IC for custom driver.

Hi all,

I'm looking for an IC that I can use to create a buck-boost 1000mA driver with that will allow the use of CR123 or single lithium ion rechargeables. It seems the 1.5V - 4.2V specification is tricky. Plenty of 2.7V - 5.5V drivers, just nothing that will go low enough to work properly with a CR123 cell.

Alternatively a 2AA IC would be OK.

I've spent days looking but can't seem to find anything. Basically just hoping someone else knows of an IC I could use?

- Matt