IMO there are times you don't make sense...
If you had a 5V source, you wouldn't need a regulator (assuming that 5V source can provide 2A).
You could use a linear reg - they are available with 3A outputs else can be boosted with 2N3055 (or TIP2955 etc) transistors - but IMO why use all that volume and generate all that heat?
I'd use a switcher - only crap designs have noise issues.
And there are some nice HF designs (>1MHz) which apart from being so much smaller, IMO should be very difficult to emanate noise - eg eBay 360741066304.
Otherwise the classic ~50kHz LM2577 else newer 400kHz XL6009 designs.