No great magic - but all useful.

PFM & PWM combo IC best for low quiescent current at low load current
drains.

True output disconnect useful.

Where low current  regulated standby voltage is not needed, turn off output
feedback voltage divider.

Where say 2V is needed to run eg PIC in standby have PIC sleep with SMPS of=
f
then burst on SMPS with processor to top up psu cap. They say only 750 nS
burst needed  to recharge from 2V to 3.3V at under  10 uA load.

Some other, but that seems to be the main wisdom.

IC is synchronous buck which helps. Even then max efficincy is only slight;=
y
over 95% best case.


       R



On 7 October 2010 21:30, <alan.b.pearce@stfc.ac.uk> wrote:

> Interesting looking app note from Microchip on optimising battery life
> when using their MCP1640 DC Boost Converter chips. I haven't
> investigated these chips but from the table of features on the first
> page it looks like they can do some interesting things to help conserve
> battery life.
>
> http://ww1.microchip.com/downloads/en/AppNotes/01337A.pdf
>
>
>
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.