I followed the eval board circuit/layout exactly. I have a really hard time getting it to start up with any sort of load on it (>=100ma) with Vin < 11 volts. Over 11v Vin and everything is fine.
At first it wouldn’t start up at all with load attached regardless of Vin, until I removed the tantalum 100uF Cout and replaced it with a 100nF ceramic (maybe it’s too much with 100uF already in the load). At <11v Vin, I can start it with no load and then attach the load, but regulation is not good at all.
Does anyone have any suggestion to get this to work better in the 10-11v Vin range?
To finish this thread that is abandoned by MP staff, I switched to MAX17643 and have no more issues. I even test it with wrong parts (what I had on-hand from the MP project) and it still works fine! Solid chip if 60V or less Vin is OK for you, and stable all the way down to 6V.