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Multiplex your inductor

Discussion in 'Electronic Design' started by Winfield Hill, Mar 30, 2010.

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  1. I missed this when it first came out in 2004 - TI
    introduced a four-output SMPS chip meant for cell
    phones, very small, and to even further save size,
    it required only one small inductor. The secret?
    Multiplex your precious inductor cycle-by-cycle,
    among three outputs! Create +5, +20 and -18, all
    from one 10uH inductor. It's TI's tps65120 to 24.

    Stay happy.
  2. Joerg

    Joerg Guest

    And as usual nearly unobtanium, a whopping 58 pieces left to be scraped
    off the bottom of the barrel:

    It's sad, they employ smart engineers like yourself and then seem to
    waste so much of their creativeness by screwing up the logistics.

    This is how it's done right:
  3. legg

    legg Guest

    The power-up and power-down sequencing looks scarey. You wouldn't want
    too much interdependency between Main and Vgh, as is.

  4. Joerg

    Joerg Guest

    232 is just about the only thing I am not so concerned about, but only
    if there's 2nd source.

    I was actually just thinking about buying LTC for our IRA. Healthy
    fundamentals, they pay dividends, but the high P/E of 28 ain't my cup of
    tea. Personally I'd never buy Maxim stock though, ever. Unless 100% of
    top management is changed out _and_ I've seen at least two years of
    consistent volume shipments.

    I've never looked, since I never design in MAX parts ;-)
  5. Joerg

    Joerg Guest

    To me, growth means nothing if it's more or less artificial. If
    potential customers repeatedly can't get product delivered then the
    executives didn't properly execute.

    Always depends on the company. The ones I worked for never did or
    allowed such tricks. No re-pricing.
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