I have cleared interview of a major tech company and right now background checks are going on through third party company.

I had a small issue of being charged with a misdemeanor that is a reduced form of DUI. The charges have been resolved and I am trying to move on with my life. What is the best way to address this when applying for jobs? Should I just hope they do not find it on the back ground check or if they do that they will ignore the problem? If I have not informed the company of the issue is it too late for me to address it?