I have a LMZ14201 buck converter circuit (3.3V dc output), the output is well behaved when running, it has a soft start feature and ramps up very nicely. However sometimes on power-up (perhaps 1 in 10), prior to the soft start circuit and exactly at the moment of energization there is a short spike, sometimes two of them that last about 50nS at the 3.3V output, the peak voltage is about 7V. This circuit powers various digital IC's and I want to make sure they don't get damaged from these 50ns spikes.
The energy would obviously be quite low because of the short duration, should I be concerned and add a TVS on the output, or are these spikes too short to be concerned about?
When the spikes occur they are approximately where the red bar is in the first image.