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Low power device

I'm designing a low power board. I need to make 3.3V.

Is it more efficient in general to take a 9V battery and switch down to

3.3V or take two AA batteries in series and switch up to 3.3V?

I know it depends on how efficient the switcher is... I'm just trying to decide Buck or Boost.

Thanks,

Eric

Reply to
Eric
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Hi Eric,

Check L6920 from ST.

Vladimir Vassilevsky

DSP and Mixed Signal Design Consultant

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Reply to
Vladimir Vassilevsky

Not sure which is more efficient, but maybe switch up is your best option using charge pump device. TI do some devices specifically for converting two AA batteries to 3v3. See

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or more specifically:

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Regards,

Paul.

Reply to
Paul Taylor

Note that from the user's standpoint, it's much more efficient for him to use 2 AA batteries. They are much cheaper per watthour, have less internal resistance and are easer to find fresh than 9v batteries.

Reply to
Jim Stewart

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