We are developing a custom PCB for the RAK3172. The board will be powered by two Energizer L91 Ultimate Lithium AA Batteries in series, which usually produces a max of 3.55 volts out of the box (series).
The application is a low power sensor board with the intent of years of deployment.
Per the datasheet, it appears I am within the recommended supply voltage range (2.0V - 3.6V) when the batteries are fresh.
Since I am within the range I would like to direct drive the board from the batteries, but I wanted to see if this is advisable.
Alternatively, I could use a buck/boost (like a MAX1724 3V3) but this would almost double my sleeping current usage and I am not sure it is necessary.
Any advice would be appreciated.