piclist 2008\07\04\051809a >
Thread: USB power in parallel
face picon face BY : Jinx email (remove spam text)

> 4 NimH cells may be 6v fresh, but quickly go to 5v, then drop to
> 4v at end of use for that charge. Not enough headroom for a simple
> regulator

You could go to 6 cells couldn't you ? And a buck-boost SMPS to
get 5V from 4V-6V doesn't necessarily have to be too complicated.
Even just a boost followed by an LDO linear perhaps

<004501c8ddb4$a9c9b700$89aafea9@ivp1> 7bit

See also: www.piclist.com/techref/power.htm?key=power
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