I'm looking for a really efficient boost converter IC.
My operating condition is 2.2 to 2.4 volts input and 2.6 volts output at 5mA load.
I've been trying that are around 90% efficient. Most are able to go way over 500mA load, which I don't need. They've got low Ron MOSFETs, which is good. But they also run at 500kHz or higher, and waste power driving these over-sized MOSFETs, and that's bad.
Some have special burst of PFM modes to save power at low currents. This can work well at no load, very low input current, but not so well at 5mA load.
I think I need a different class of part. I'd like 98% efficiency. Hey, I'm only trying to get 0.2 to 0.4 more volts from my source, at 5mA, sheesh!