How to drop the voltage by a low value (let's say <150mV) without wasting current to supply a microcontroller that spend most of its time in deep sleep mode?
I'm working on a board with a microcontroller that will accept up to 3.6V as supply voltage but LiFePO4 and Li/SOCl2 can go slightly higher when fully charged (or during charge for LiFePO4). The microcontroller uses ~10μA during deep sleep and can use up to 500mA (mostly spikes) when active and transmitting over WiFi (ESP32).
I know that I can use an LDO with a low quiescent current but I am curious if there are better/cheaper alternatives. For example, I thought about using the drop voltage of a Schottky diode.