Input is 16.5V from the output of a switcher which has good load regulation. For some reason I'm getting a 400mV drop out of this LDO from 15.2V down to 14.8V when I load the output with 100mA. I can't see anything obvious. The FB is about 0.75ohms at DC so it will drop 75mV, but not enough to hit the drop out. My -15V LDO works fine, but its just the +15V that has this problem. Layouts for both supplies are similar and optimal (short distances to bypass).
Any ideas? Did I miss a detail in the data