From MMPF0100Z datasheet section 8.1.2 Bill of material selected inductor saturation current value is 4.5Amp for BUCK, SW1AB - (0.300-1.875 V), 2.5 A.
It seems that this current rating much overrated?
For a buck convertor with VIN = VINSW1x = 3.6 V, VSW1x = 1.2 V, ISW1AB= 2.5A, Eff= 80%, Fsw=2Mhz
Considering 30% derating 3.6Amp saturation current inductor should be OK.
Please let us know is this OK to select a inductor part as per above calculation. This is to reduce overall PMIC supply cost as our current requirement is much lesser than current available on each buck converter of PMIC.