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Thread: Max1771

  1. #1
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    Max1771

    I was looking into step-up/step-down voltage regulators for providing a constant 12v to my LCD and I ran across the MAX1771.

    http://pdfserv.maxim-ic.com/en/ds/MAX1771.pdf

    From the datasheet, it looks like it can take in 2-16.5v and produce 12v out at 24W. The price is < $2. Am I overlooking anything, or can I just build the reference circuit and have a simple regulator?

    --Tom

  2. #2
    Low Bitrate doig's Avatar
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    from what i could see its only a step up regulator, so anything above 12 is bad news.

    look at the typical operating circuit on the first page

  3. #3
    It ain't easy being a green moderator meddler's Avatar
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    the MAX1771 is a step up chip only. Yes, it takes 2 to 16.5V but the output is adjustable, not just 12V. If you wanted to have the input from 8V to 14V with a 12V output you would have to use something like a LM2587 from National Semiconductors in a flyback regulator setup. The sproggy used to use this setup but has been changed to a MAX1771 in its latest reincarnation due to the difficulty in getting parts. Do a bit of a search through the Sproggy power supply threads and you should be able to find the answers to most of your questions.
    Never let the truth get in the way of a good story

  4. #4
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    Thanks for the advice.

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