Help, I need to step up 3.2 VDC to 12 VDC (fixed, not variable)

Hey everyone 🙂

I want to power my equipment.
It requires 12vdc.
I want to power it with my LiFePO4 100ah 3.2vdc battery.

Please share with me if you have a circuit for me to build a dc to dc converter in 3.2vdc and out 12vdc.

I need it fixed at 12vdc, not a variable within particular range.
Also, I need it at least 2 ampere, the larger the better.
 
Why build.
2 amp to 5 amp DC to DC boost converter is about 9 dollars

You can order with credit card in less time to even read driver data sheet.

Texas Instruments will have many DC to DC designs
on their website.
Once you find one you like.
As mentioned there will be about 50 to 100 versions
of it on ebay already made