I will be copying a Ti reference desgin with a couple of slight modifications. Creating a single mode driver with over 90% efficency using the chip I pointed out (in the original post Tex linked to) up to 30W boost off a single Li-ion with output up to ~13V seems very simple… I haven’t actually built anything yet (still waiting on parts) but implementing the modes and squeezing it onto a 17m board is going to be the hard bit. I’ll post up a couple of schematics for the electrical engineers out there to review before I start prototyping.