In the below pictured circuit for the MC33063 by TI, how important is the capacitance of the inpu-output caps? I understand why they're there, I don't know what the recommended capacitance is derived from. I am using the QFN package.
The reason I ask is that I have very little space left on my board and the caps tend to get relatively large, even at 16V, not to mention more. I think I might be able to cram a 100uF/6.3V on the output in a B case, and a 100uF/16V C case on the input, both tantalum, but I doubt they'll be low ESR.
Possibly if the capacitance was slightly lower, I could either use a smaller case or lower ESR. Real input voltage will be 12-14V.
Would that be possible?
Also, what is the smallest package available for the diode?
Update: This is what I've come up with so far. If I can find all three in B case, given that the output will be a pair of 220uF/6.3V, than I can fit them.
Please don't mind the dirty schematic with incorrect values for 4.1 output etc.