I've run into a strange problem with an ADP124 3.3V regulator. I have a design that has a 5V rail that is used to power the ADP124 regulator as well as an ADR130 1V Reference. The output of the ADR130 is sent to a MAX5482 Digital pot. The wiper of the digital pot feeds a source with a 1M input impedance. When I set the digital pot to about halfway through it's range (producing approximately 0.5 on the wiper) the ADP124 craps out and then starts passing about 4.4 - 4.5 of DC. Both the MAX5482 and the ADR130 are powered by the 5V rail. I don't see any current spikes or anything of that nature on 5V rail when it happens. If I adjust the pot so that the wiper voltage is lowered to less than 0.5V the 3.3V rail comes back into regulation. I'm about out of ideas, I'm really at a loss any thoughts or troubleshooting suggestions would be appreciated.