Do we have any PSRR performance data (vs freq) for the TPS50601A-SP?
Does the spice model accurately predict PSRR?
Conditions:
3.3V -> 1.8V, 3A load, 100kHz, 10uH inductor, 1100uF output cap ( ~ 2mohm ESR effective), compensation = 1.74K & 220nF in parallel with 750pF