I am design a abuck dc/dc(LTC3892-1) converter、the output is 14V 36A，When I do the short circuit protection test, the BG1 pin burns out， I want to know if LTC3892-1 has short circuit protection？
As stated on page 16 of datasheet, there should be foldback current for short-circuit protection. You are building a 500W converter which is not easy to do. I assume you started by doing your own board. We usually recommend to start with a working design especially if you don't have power design experience. DC2190A-A demo board is a good way to start.