I'm considering using one of the Linear Technology push-pull driver chips, e.g. LT1533, LT1683 or LT3439. At over $4 they are pretty pricey, so I'm looking for alternatives. Do ADI have anything equivalent?
Could you use a normal buck/boost... whatever and make the output voltage a bit higher...
Then use a LDO after, followed by a large polymer low ESR capacitor.
Most noise is due to bad PCB layout not the converter itself.
You need split ground planes and never mix signal return with power ground