Elsewhere in this forum there is a thread with an efficiency graph of the UCD74120 operating at 500 kHz with an inductor ESR of 1.2 mOhm.
We need similar data for:
Vin = 12V, Vout = 0.9V, inductor ESR = 3 mOhm,typ (Coilcraft XEL5030, 0.42 uH), F,sw = 1000 kHz, generally 10-15A per phase.
Can you please provide more comprehensive data?
Thanks, Best, Steve