When considering ceramic capacitors, you should also look at their voltage dependent capacitance. As a rule of thumb, don't use high Er ceramic capacitors above 50% of theit rated voltage when capacitance matters. As you wrote in post #3, a total capacitance of 100 µF seems to be a reasonable number for the said application, less capacitance will results in two much ripple at 100 kHz. 10*10 µF ceramic caps will surely handle the ripple current. If it's appropriate for your design depends e.g. on your component sources.