Powering zx24x based project from single lipo ?

FFMan · Post by **FFMan** » 05 July 2018, 7:02 AM

The (zx24x) ATxmega32a4 datasheet says operating voltage is 1.6 to 3.6

A typical single cell lipo output could be from 4.2v down to say 3v for safety.

I'd also want to power a GPS module (3.3v, min 3v to 4.2v) and openlog which is 3.3v based on atmega328p (datasheet says 1.8 - 5.5v) to make a pocket 10hz gps logger i can program to auto stop/start in specific conditions and places.

what's the best way to power this lot given it looks like all modules will run down to my 3v min, but i want to limit voltage on a fresh charge ?

Post by **dkinzer** » 05 July 2018, 16:46 PM

FFMan wrote:i want to limit voltage on a fresh charge ?

You might look at designing a switching power supply that outputs 3.0 volts irrespective of the input voltage. I don't have any experience in doing this so I can't say what a minimum input voltage might be to keep the output at 3.0 volts.

GTBecker · Post by **GTBecker** » 05 July 2018, 17:10 PM

> ... a switching power supply that outputs 3.0 volts irrespective of the input voltage...

While not inexpensive, DimensionEngineering.com produces the AnyVolt DC-DC converter.

Tom

Post by **dkinzer** » 05 July 2018, 17:59 PM

GTBecker wrote:AnyVolt DC-DC converter

Wow! Those are great! Up to 500 mA (at under 10V).

FFMan · Post by **FFMan** » 06 July 2018, 1:04 AM

thanks - exactly the type of thing i'm looking for.

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