The other day, I found the LTC3525 – an interesting little (yes, tiny!) boost regulator chip, which might be a pretty good power source for low-power JeeNodes.
Couldn’t resist – had to try it…
Here’s a test setup using my favorite foam-board as base, with one AA battery driving a test LED:
(hard to see, but that LED is indeed on)
Did I mention that the whole thing uses tiny parts? It did take some patience…
Tests show that it will regulate any input voltage from 0.8V .. 5.5V to 3.3V @ 60..200 mA depending on the input voltage. And with 70..90% efficiency, even in the 10′s of µA current consumption range. I’ve verified that it will indeed down-regulate when fed > 3.3V, which makes it very flexible.
The quiescent current draw of this circuit appears to be around 20 µA on a 1.3V input.
So it looks like this could work out nicely:
My hunch is that this thing could last 6 months for a room node. Maybe more, but with a 6-pack of AA batteries plus charger, who cares?
Hmm, might be worth designing a little board for…