Regarding Data sheet of LT1963A, we can see the transient response waveform about Vo=1.2V, 2.5V and 5V. Our customer wants to see in addition Vo=1.8V and 3.3V. If you have the waveforms, please let me know.
Do you have the recommendation value of the output capacitor ESR ? I think that the 3 ohm in data sheet is a little bit too large.