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Data sheet question

  1. Jul 23, 2007 #1
    Take a look at this data sheet here and tell me this:
    There are multiple pins assigned for the same function. there are two pins for SW and three for PGND and VOUT each. Do I only need to connect one of each pins or connect them all. I'm designing a board for the first time here.

    thanks

    --KoZu
     
  2. jcsd
  3. Jul 23, 2007 #2

    berkeman

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    Staff: Mentor

    Absolutely connect them all as shown in the datasheet schematics. And layout is very important for DC-DC converters like this, so it would be best if you could find some recommended PCB layout patterns to start with.

    Have you looked at the National Instruments "Simple Switcher" series of DC-DC converts as an alternative? I think they tend to give sample 1-layer and 2-layer layout examples for those designs. Or at least do some more searching in the TI application note literature to see if you can find an example layout.
     
  4. Jul 24, 2007 #3
    I did some research, looks like this isn't a very used converter, but to me it was pretty much the only one available to suit my needs, unless I want to order directly from a manufacturer in which case the shipping alone would cost ten times more than the chip itself.

    So.. when I build this thing, I connect the three VOUT etc. pins together?
     
  5. Jul 24, 2007 #4

    NoTime

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    Science Advisor
    Homework Helper

    Yes, they use multiple pins to increase current handling capacity.
     
  6. Jul 24, 2007 #5

    AlephZero

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    On page 13, "Layout Considerations", it says

    "use wide and short traces for the main current path and for the power ground tracks."

    I would interpret that as "make one wide track on the PCB connected to the three VOUT pins on the chip" and the same for the three PGND pins.
     
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