You should be able to drop the specs you need into the zenode search and get some options; there's always so many choices for buck converters! Are you looking

You should be able to drop the specs you need into the zenode search and get some options; there's always so many choices for buck converters! Are you looking at a multiphase design? I think I've seen a few chips that control multiphase converters: You'd get a much higher current design with just one IC (and a few extra inductors).