LM2991 Absolute Maximum Rating margin.

Yes, same voltage rating for both points.

Thank you very much.

Regard.

Bob Lee

I use the LM2991 close to 26V input voltage at light load. What happens to the LM2991 beyond 26V at the input?

LM2991 Negative Low Dropout Adjustable Regulator

" ... What happens to the LM2991 beyond 26V at the input? ... "

Unknown.

This is an older device and there does not appear to be any characterization information available for device behaviour with Vin beyond -26V.

My guess is that 1V, or perhaps 2V, beyond -26V might be tolerated as long as the duration was relatively short. A few seconds.

Again, my best guess.