Device to be used in: solar-powered microcontroller with some peripherals attached.
Meant to operate whenever sufficient power is supplied (light is bright enough for a while). No battery, weather reasons.
Device is powered from a mp1584en buck voltage regulator, with large caps on both input (useful for solar, I think) and output (in case device needs more current for its nrf24l01 radio).
What I want to accomplish is a behavior where the buck gives no output when voltage on input side is too low (threshold to be determined later, expected ~9V of max 25V), but also to avoid it repeatedly turning on/off in low(ish) light, so turning back on shoud happen on a higher voltage (16V?).
Low-component-count solutions preferred, I'm not skilled enough not to mess up otherwise.