I found that the junction temperatures for both is very different. It is way higher for the TPS57060-Q1 than the TPS54060A, this is because I need to replace the TPS54060A with the TPS57060-Q1, but the TPS57060-Q1 seems much worse in terms of thermal rating> I would also like to know what is the main source of heat dissipation, I would assume it's junction to board, but can you please confirm. I created this table to look at the comparison which I have attached to this post.comparison.xlsx