LM2664 can I use the ceramic capacitors instead of the electrolytic ones?
I've had a look through the datasheet and all it seems to say about the capacitors is that they must have a low ESR. I can't find anywhere that it specifies a minimum ESR or states that they must be electrolytic.

Therefore, I think you can safety use ceramic capacitors as these have a very low ESR.

Hypothetically, if the datasheet did require a minimum ESR (as some devices do), you could still use a ceramic capacitor instead. All you'd have to do is place a small resistor in series with the ceramic capacitor (around 0.5 ohms, or whatever value the minimum is in the datasheet).