Search markin code AXNM

Great, it appears the package type matches that of the SOT583.

I see that our FAE, Stephen is supporting you in the following linked post:

Blockquote MP2393 not working, looking for replacement - DC-DC Power Converters - Monolithic Power Systems’ Technical Forum

The replacement parts match the ones I have listed above on Oct 7th so there should be a pin-to-pin replacement. But I see that you are currently developing. Help will be directed to you on that thread.