I would agree with the others as far as using a switch mode supply. You could use an LDO linear regulator after your switching regulator if you wanted to reduce the output noise. There are actually some switching regulators that have an LDO on the output for this reason.
If it helps, here is a simple project I built last year that incorporates a boost converter to switch a single cell li-ion 3.7v to 12 volts to power an 80mm PC fan. I’m by no means an expert in this field, but if something I’ve done can help you in your design feel free to use it. In your case you would need a step-down converter since your input voltage is much higher.