I have a power up stability issue with the LM25088MH-1. The input is +20 V, output is 6.7V, current is 4.5A, switching frequency 1 MHz and frequency dithering is enabled.
Failure was observed intermittently while the unit was hot +50C. During power up the output voltage was 4.3V instead of 6.7V. I can reproduce the issue by slowly ramping up the +20V input at room temperature. If I disable dither, it consistently fails.
I am not able to reduce the failure if I reduce the switching frequency to 532 KHz. Could the stability issue be due to operating at the maximum switching frequency?