1 Amp DC/DC Converter Chip?

"bcjames" wrote in message
...
I want to build a 5 Volt power suppply to run my PDA in my
glider from the 12 volt battery. Sometimes I use a 14 volt
battery too, so it needs some input voltage range. I'm
looking for suggestions and a DigiKey part number for a
suitable 1 amp DC/DC integrated power supply chip.

I'd like:
at least 80% efficient
no radio noise
Vin of 10.5 to 16.5 volts
Vout 5 volts
1 amp
low cost

I've looked at the LM2825 and the LTC1174-5, but I'd like to
hear from anyone who's done this.

Thanks


Well, good luck. Anything that is 80% efficient and low cost is going to
have some RF noise.
You might look on the National Semiconductor website. They have an online
design tool using their parts -- it gives you a circuit and a parts list.
For some additional cost, they'll ship you a PC board and the parts.

Tim Ward