Sorry in advance for what may be an elementary question. I'm designing a circuit to provide a few hundred milliseconds of backup power to an eMMC module in case of power loss. This is to provide the module a chance to flush any pending writes to prevent corruption. My thought was to simply lay a sizable capacitor in parallel with VCC and GND. But I'm assuming I'll need to do something to ensure that power supplied to the eMMC while the cap is discharging is cut as soon as the voltage dips below 3.3v, so the eMMC module doesn't flicker on and off during that time.
So first, is this in fact an issue I need to worry about, or does it not matter if the eMMC flickers for a short duration or is supplied too low of a voltage? Second, assuming it does matter can someone suggest an MCU or something to handle this?