I have a fistful of Pro Mini clones with atmega168 ICs. Oddly they have 16MHz crystals. When I feed it nominal 3.7V (really 4V, but it will spend most time around 3.7) via the RAW pin, I see 2.6V on VCC and RST pins. Of course I’d like a bit more for my MOSFETs - what’s the cause of this? It’s a 1.4V drop, is this common for pro minis?
I can feed 3.3V to VCC with a regulator, but the 16MHz crystal is puzzling. Clocked for 16MHz?