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Voltage regulator recommendation

Discussion in 'Electronic Design' started by Jim Whiting, Sep 1, 2006.

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  1. Jim Whiting

    Jim Whiting Guest

    I'm about to start on a project utilizing batterys as a power source (not
    an area where i have done much work).
    I'm looking for suggestions for the supply voltage regulator IC. with a 5v.
    output at less than 100mA. I expect input voltage to be between 6.5 and 9
    depending on the requirements of the P.S.chip.
    Efficiency matters
    There are a lot of ICs out there, has anyone got a product suggestion
    Thanks,
    Jim
     
  2. Don Foreman

    Don Foreman Guest

    Go to
    http://www.national.com/appinfo/power/
    to select a suitable part (and design) for your application.

    Note that your supply must stay in regulation as battery voltage drops
    with use. How much that might be depends on the batteries. Alkaline
    cells will drop to about 0.9 volts per cell -- which means a nominally
    9 volt supply would be 5.4 volts at end of life. Other battery
    chemistries will droop less. If you go with a supply that will droop
    below the desired output voltage, then you'll have to go with a
    boost-buck or SEPIC configuration which is more complex and not as
    easy to design. A simple buck regulator is very easy to design.
     
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