1 Amp DC/DC Converter Chip?

nyone know how to
tell the IPAQ not to charge its internal battery off my
glider battery?

Todd, I think that depends on which pin you have the power going to. On my
Pocket PC and on my Sony Clie, one pin just powers the electronics, another
powers the electronics and charges the battery. Your pinout schematic should
have that info. Another option is to fully charge the battery the night
before. Keep in mind the current draw changes accordingly to the demands of
charging.

Jim Vincent
N483SZ
illspam

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

Digi-Key does carry dc-dc modules that are self contained except for
some external capacitance. They are quite low noise; I have used them.
Designing a converter from components is best left to the pros (I am a
pro and I avoid it).

Tom