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buck stepdown chips

Discussion in 'Electronic Design' started by Jamie Morken, Nov 24, 2004.

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  1. Jamie Morken

    Jamie Morken Guest


    I am looking for some high frequency (1MHz+) step down buck switcher
    chips that can handle an input voltage of at least 7.4V and at least
    500mA output current. The Texas Instruments TPS623xx 500mA/3MHz
    switchers are perfect but they are only rated at 6Volts input max! I am
    sure they could take 7.4V but I would rather not risk this :) I need to
    generate 5V, 3.3V and several other lower voltages from the 7.4V (two
    lithium batteries in series). This is a portable application, so power
    is an issue or I would just use a linear regulator to generate 6V from
    the 7.4V input.

    Jamie Morken
  2. Anders F

    Anders F Guest

    So you're space constrained? Lower switch freq=higher efficiency...
    Lots of them around! Check National, Maxim, Semtec etc...

  3. Did you look at the TPS62050? It accepts up to 10V input and is pretty
    efficient. It runs at 850kHz usually, which is a bit under your
    1MHz. Although it would seem you can synchronize it to an external
    signal up to 1.2MHz so it might still be OK. I have used them without
    problems (although the packaging is quite small and they can be
    difficult to get sometimes).
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