Oscillation problem of LDO

[boranavi]

I have big problem with our LDO which can drive up to 300mA dual. I couldn't find out output oscillation on simulation, but it happened on silicon. anyone can give tips to work this out.

 

[pfd001]

Maybe your phase margin is not enough. Because of process variation, the phase margin is changed in silicion. Try to change your load cap

 

[leo_o2]

What's your LDO structure? Maybe you can paste it here, then others can help you to find parasite pole.
What's poles and zeroes location? How many gain stage?

 

[elbadry]

If the non-dominant pole is the output pole, try to reduce the load capacitance to the LDO. If not possible, you can add a resistor in parallel to the load cap. Both solutions will degrade the refulator's performance