These are rather too much I think for your low current application because the chip alone draws several mA, but I've used the CS5171 with good success. Input voltage is up to 30V. I've used them to get 5 volts at a few hundred mA from a 10v - 15v input source.

http://www.onsemi.com/pub_link/Collateral/CS5171-D.PDF

I don't really have any experience with "small" converters of only a few mA so I can't recommend a "favorite" chip for that...


steve