Hey guys, I am very new here and have never had any experience with DC/DC buck converters. I Looked at this one: http://www.fairchildsemi.com/ds/FA/FAN2103.pdf
It seemed fit for my application, but then a question came to mind. It says the output can range from .8v to 90% Vcc, so i am under the impression that as the input voltage changes, so does the output voltage. This will be powered by Lipo, nimh, nicd, A123, etc... batteries and their voltage drops as they are used (well lipos not so much) and i need this regulator to pump out a steady five volts @ 3A. Any thoughts? Thanks!

 

A 5A, 3V output is definitely conceivable with this part. If the voltage varied it wouldn't be a very good "regulator" now would it?

 

that means at a given Vin, the output is between .8v - 90% of Vin.

that is also in a leadless package. not diy-friendly.

 

Thanks guys, just one more thing. When it says it can handle an input voltage of 3 to 28 volts, does that apply for the Vcc input? I cant seem to find the maximum Vcc amp rating ....