TPS54160A: POWER INTEGRITY DESIGN

Part Number: TPS54160A

Tool/software:

I need  to model TPS54160A  using 4-element VRM model with the parameter of  slew inductance(Lslew), Flat Resistance(Rflat), Output inductance (Lout), Output Resistance(Ro).  Could you suggest how to calculate the parameters particularly Lslew. And also is there any other 4 element combination is available for the VRM.