Invisible wrote:
> Mike Raiford wrote:
> 
>> This is why battery operated electronics can run until the battery is 
>> almost flat, even though the battery's voltage continually drops as 
>> it's drained.
> 
> Really? That's interesting. I always thought it was the battery outputs 
> full voltage until just before it actually dies (which is why battery 
> meters are never, ever, under any circumstances, actually accurate).

Here's an example of a charge pump voltage regulator:

   http://www.ti.com/lit/gpn/reg711-33

Note the input voltage range; +1.8V to +5.5V vs. the output voltage; +3.3V
for the REG711-3.3.

-- 
Tor Olav
http://subcube.com

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