Olin Lathrop wrote:
> Not without some serious magic.  3.3V x 10mA = 330mW.

Oops.  Looks like I slipped a decimal point.  3.3V x 10mA = 33mW, which is
at least possible to get from 50mW.  While it is theoretically possible,
it's going to be difficult converting from such a low voltage.  If you can
somehow bootstrap, maybe with the use of a battery, to the 3.3V or 5V then
you have enough to run a switcher to sustain the higher voltage.  Getting
there from only 500mV will be tough.

Two of these in series would do it.  That would allow a simple analog
circuit to make 5V at low current and medium efficiency, which then allows
more complex circuit to run that makes the final output voltage much more
efficiently from the 500mV in.


******************************************************************
Embed Inc, Littleton Massachusetts, (978) 742-9014.  #1 PIC
consultant in 2004 program year.  http://www.embedinc.com/products
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist