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3.3V Regulator

Discussion in 'Electronic Design' started by [email protected], May 24, 2006.

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  1. Guest

    Dear Group, I looking for a 3.3 Volts Regulator (linear or Switched) on
    a small package,
    @ 2Amps, Anyone know some types?, it will be very comercial chip!
    Thanks
     
  2. Guest

    This is such an open-ended question I don't know where to start.
    I think you need to give more information. Like, input voltage, and if
    heat/efficiency matters.
     
  3. Jamie

    Jamie Guest

    Hmm, a basic Zener of aprox 3.8v volts on a basic
    base driver circuit maybe ?
    i guess it would be in impact mode at that low
    level instead of zener mode. oh well
     
  4. Guest

    Well, I think that input voltage is between 9 adn 12 VDC, the current
    output must be at leas 1.5 Amps
     
  5. Pooh Bear

    Pooh Bear Guest

    Which means that the package size is likely to be be determined by thermal
    dissipation if a linear regulator is used ( Pd = Vin - Vout X Iload so up to 18W
    ! ) so a switcher seems the best idea.

    Graham
     
  6. Rich Grise

    Rich Grise Guest

    First you said 2 amps. 1.5 amps is significantly different - use an
    LM317. They come in SOT-223, but you'll need a significant heat sink.
    http://www.national.com/pf/LM/LM317.html

    Good Luck!
    Rich
     
  7. Guest

    do you know the sharp series?, like the 070XH02, how I can use this?
     
  8. Guest

    Use a National LM2678 or similar. These switchers are actually good
    for 5A. I've been using them and they work well. I believe there's
    another part number that works up to 2 or 3 A. The LM2678 is
    adjustable, but there is a 3.3V-only version.

    With 9-12V in, you "have" to use a switcher. A linear is going to
    generate tons of heat.
     
  9. Pooh Bear

    Pooh Bear Guest

    You'll never get that much heat out of an SOT-223 package.

    Graham
     
  10. Pooh Bear

    Pooh Bear Guest

    A Google for "070XH02" suggests it's obsolete.

    Graham
     
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