Who makes decent affordable DC-DC silicon other than TI?
Don’t say high-price LT.
There's an obscure company called "Alpha and Omega Semiconductor" that seems to be doing
some decent work. E.g.,
AOZ1050 (although that particular one is NRND). Their parts seem to have a decent compromise between simplicity, performance, EMI, and overall efficiency.
They are present on some FPGA integration boards that I've used and I haven't seen any of them melt down yet. That particular board also uses a part from
Richtek that seems to work well.
One concern I have with LT lately is that they don't seem to be able to deliver certain new parts in volume. The LT8650 is a nice part that I'm using in a design now, but either they can't build them for some reason, don't care to provide them via normal distribution channels, or somebody is buying all of them they can make. This has been true for the better part of a year now. I don't remember this happening with Linear before.
AoS isn't obscure. 
(Shrug) I'd never heard of them before I encountered their parts on the ZTex boards. Never seen them used anywhere else.
Goofy name, that's for sure. Makes me think I'm buying from the Branch Davidians or something.