TPS549D22: Parallel connection to get 60A max current

TPS549D22 does not directly support parallel operation. You will need a stackable multiphase solution. What is your input and output voltage? Any other features you need?

VIN = 12V
Vout = 0.8V to 0.9V with 0.85V (nominal)
Current = 50A Max
Programmable through I2C
Output voltage should be programmable
Enable option

I think you were on the right track before. TPS53647 seems a perfect fit. Why do you think it is "too complicated"?

I think it support 120A current with all four phase.
Do i need to use all four phase for 50A current reuirement?
Is it compatiple for I2C bus interface ?

TPS53647 looks like it supports different phase arrangements. I don't know the details as that device comes from a different group. We are alerted internally based on the part number in the field that you entered above, so if the topic moves to a different part number it is best to start a new thread so that it gets routed to the correct group. Another option for just 2 phase operation up to 60 A would be TPS40422.