Electronics > Projects, Designs, and Technical Stuff
Powering by 1*AA battery
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001:
Hi!

I see lot of calculators use single AA/AAA battery
What the right way to boost 1.2V to 3.3-5V for MCs?
Can You post some standard circuit (built-in NiMH charger will be ok too)?


Thanx
ogden:
Check datasheet of TI TPS6126x. Also ON Semiconductor offers pretty popular boost converter IC's for single alkaline/nimh cell.
Dave:
Calculators use ASICs (the black blob in the middle of the PCB) that are designed to use the wide-ish voltage span of the single alkaline battery directly.
I know this isn't a solution to you, just wanted to share a tidbit that you might find interesting.
NivagSwerdna:
MCP1640 Single Quadruple-A Battery Boost ... - Microchip
Googled gives a nice reference design with low Iq
A couple of years old but I like it.
james_s:
There's an open source project called the Backwoods Logger that runs months on a single AA or AAA battery. Have a look at that for an example of a boost converter. I don't remember what IC it uses but I built the AAA version years ago and it runs a very long time.
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