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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

    Hi,

    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.

    cheers,
    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...

    /A
     
  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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