Hi group,
There is nothing new about the schematic. The application for battery life extension is stated on the LTC3526 datasheet published in 2007.
AAA implementationI was successful in building a boost converter in the AA form factor. I wanted to see if the AAA form factor was possible.
(The PCB is 10mm diameter (2 Bs' D)
Here is my schematic:
![](https://www.eevblog.com/forum/blog/eevblog-751-how-to-debunk-a-product-(the-batteriser)/?action=dlattach;attach=204427;image)
And here is component placement for an AAA size boost converter:
![](https://www.eevblog.com/forum/blog/eevblog-751-how-to-debunk-a-product-(the-batteriser)/?action=dlattach;attach=204429;image)
It would be possible to route this arrangement without too much difficulty. I have reduced the size of the input and output capacitor to 0402. Digikey has 0402 4.7uF at 4V X5R.
I used a 1.6mm x 1.6mm MAPI inductor from Wurth. This inductor has a DCR of 338m Ohms.
It is possible to build this circuit in the required space.
LTspice Model of the AAA solutionI constructed an LTspice model to see what kind of performance can be expected from this implementation.
Modelling ResultsIt works well enough to fool a
VC monkey. The output is limited to 150mA with a 1.2V battery.
![](https://www.eevblog.com/forum/blog/eevblog-751-how-to-debunk-a-product-(the-batteriser)/?action=dlattach;attach=204433;image)
At 1.0V input.
![](https://www.eevblog.com/forum/blog/eevblog-751-how-to-debunk-a-product-(the-batteriser)/?action=dlattach;attach=204435;image)
Now I could probably squeeze a little more output with a larger inductor, but not much more.
![ThumbsDown :--](https://www.eevblog.com/forum/Smileys/default/icon_thumbsdown.gif.pagespeed.ce.D027Y9gZ7m.gif)
Regards,
Jay_Diddy_B