Before you do, think through what's causing the burnout. It could be the hours, that's where everyone goes first, but it could be a particular client, it could be the number of projects you're having to concurrently work, it could be your environment, it could something else completely, or it could be a combination of a bunch of those things.
Once you get sorta close to what's causing the burnout you can work to a solution that you can pitch your boss. But I wouldn't lead with it, I'd let him ask you "so what can we do" and then present what you're thinking.
Speaking as a boss, I really don't want people quitting for negative reasons. If they get some crazy offer that I can't match or they get to work on some cool tech that excites them, them's the breaks and it suck for me but I'm excited for them. But if I have people quitting for systemic reasons, man that's bad juju and I need to know so I can fix that shit before quitting becomes contagious and I lose a shop full of good people.
It's also been mentioned a couple times to see a counselor. I concur. You may be dealing with some anxiety and depression issues that a qualified doc can help you through.