Tor Olav Kristensen wrote:
> 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.

I also recommend reading this:

   http://www.maxim-ic.com/appnotes.cfm/an_pk/737/

-- 
Tor Olav
http://subcube.com

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