If we are using a buck converter of say 5V 1A output, we definitely require input and output capacitors.
Just without making any calculations, is there a thumb rule on what the values of the input and output capacitors value need to be? Without considering any specification, just to arrive at the values.
Is it really necessary to have the electrolytic capacitors at the output? Can't we just use the ceramic capacitor itself? (I read that the ESR of the electrolytic capacitors helps to control loop stability of the feedback loop of the converter.)