I'm having a little trouble bringing up buck3 on my regulator. I built this design on another board and all four worked fine. Now however on two new boards buck3 does not work. I leave it set to the default 1.8V and enable it but I get a steady 560mV output. I don't observe any switching on the near side of the inductor. I checked the status registers and it tells me that the regulator is enabled, but under voltage. The part is cool under a thermal camera. Input voltage is 4.2V.
I'm sure it's something we've done but I thought maybe this steady output voltage might be a clue you could help me with.
Thank you
