I'm selecting parts to build a 3 to 5V boost DC-DC converter using the LTC3525-5. The board I'm planing to build is based on the typical application shown in page 11 of the aforementioned datasheet, which schematic I reproduce below:
At the end of page 10, the datasheet says:
The input and output capacitors should be X5R or X7R types, not Y5V.
I'm not familiar to the various types of SMD ceramic capacitors, so my main questions are: Why exactly makes Y5V capacitors not suitable for this application? And why X5R or X7R are suitable?
I've tried to search for the answer elsewhere, but nothing stood out on the sea of numbers and parameters on various datasheets out there. The best hits I got were the following documents:
I suspect that the answer has something to do with ESR and maybe the capacitance varying with voltage on switching applications, but I can't tell exactly what's at play in this particular circuit.
And, the really silly question is: can I use a through-hole aluminum bipolar capacitors instead? If not, why not?