Battery Power Advice

Discussion in 'The Projects Forum' started by eeboy, Mar 30, 2008.

  1. eeboy

    Thread Starter Active Member

    Sep 27, 2007
    90
    1
    I am designing a watch for commercial purposes. One of the specialty IC's involved requires 3.3V. I don't have the real estate for several batteries. I am pretty much constrained to one or two small coin cell batteries (the 6 mm guys). Given that two coin cells in series is only 3V my voltage would drop below the minimum voltage for the IC before the batteries were completely depleted. So you see my issue...

    My thought was to design a simple boost regulator to maintain 3.3V from a 1.5V cell. Seems rather complex/expensive for a somewhat simple watch... Any other thoughts or suggestions?
     
  2. Pich

    Active Member

    Mar 11, 2008
    119
    4
  3. eeboy

    Thread Starter Active Member

    Sep 27, 2007
    90
    1
    Current is very low... < 1mA steady state with the occasional 25-30mA peak.
     
  4. eeboy

    Thread Starter Active Member

    Sep 27, 2007
    90
    1
    ICL7660 is still rather expensive in quantity... $.70 at 10k
     
  5. nomurphy

    AAC Fanatic!

    Aug 8, 2005
    567
    12
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