> According to the data sheet that's not how the part works. It has a
comparator
> that detects the voltage dropping. When it sees the voltage dropping it
then
> kicks the inductor/switch/oscillator in to boost the voltage. Then it
turns
> off again until the voltage drops below the threashold again. It short it
> refills the glass when it runs low. There's 50 mV of hysteresis so that
> the comparator doesn't go nuts trying to run the engine all the time.

Sounds like a battery operated electro-mechanical clock movement :-)

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

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