Step up / Step down 5V regulator

[NC1]

Hi,

Did anybody already think about ensuring a 5V regulated source to receiver derivated from 5-cells battery ?

5V simple regulators could match only if battery voltage is always over 5V + regulator drop, i.e 6V at the best.

I saw some MAXIM application notes e.g.
http://www.maxim-ic.com/appnotes.cfm/appnote_number/2100
describing regulators that could maintain fixed output voltage even if battery input passes from above to below the reference voltage.

Would this be eventually useful and suitable for our receivers ?
Especially switching process might induce interferences ?

Finally seems a little useless to add one cell to the battery back then add circuitry to decrease voltage .... :confused:

Thanks for precious advice !
Nicolas

[Acetronics]

Hi, Nicolas

;) I tried that before ( MAX 879 ) ... but used a LT 1086 ( series regulator ) behind to wipe off all glitches and noize.
That worked well ... just for some mAmps !!!
It's so simpler to use 5 cells and a LDO regulator ... :D

Alain

PS : Maxim has committed much better than that design :D ...search better !!! see Linear App notes also : Good Stuff too !!!

[Comatose]

http://www.dimensionengineering.com/AnyVolt.htm and http://www.dimensionengineering.com/AnyVoltMini.htm are both step up/step down.

They were an absolute bear to design, and neither of those are targeted to running a reciever (mostly solar, prototyping, wind power type projects, etc)

A buck regulator and a 3s lipo pack makes so much more sense.