Will MAX660 chip get fried in this case?

Discussion in 'General Electronics Chat' started by gaganaut, May 29, 2010.

  1. gaganaut

    Thread Starter New Member

    May 27, 2010
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    0
    I have a question about the power supply to an op amp.

    My op amp requires a Vcc of +/-5V. Now fr the +5V part, I am planning to use a 78L05 voltage regulator. But I am pretty much unsure what I need to do for -5V.

    I could probably use 79L05 and get -5V directly.

    Or as a friend suggested, I could use a pump converter like MAX660 to invert the voltage. But I was looking thru the specs for MAX660 and noticed that it should invert the voltage fine, but the input current is of the order of a few uA. My 78L05 produces +5V at 100mA.

    So my question is that will the inverting of +5V (100mA) by using a MAX660 chip fry the MAX660 chip itself?

    Any help is highly appreciated.

    Thanks
     
  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    no it won't
    but negative regulators are easy
     
  3. gaganaut

    Thread Starter New Member

    May 27, 2010
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    Thanks R!f@@. I had the same feeling and in fact after I posted here, I realized that it should not matter. But a confirmation from an expert like you really puts the nail in the coffin. And as you suggested, I will use the negative regulator to keep my stuff simpler.
     
  4. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    760
    me no expert :D
    me simple guy :p
     
  5. beenthere

    Retired Moderator

    Apr 20, 2004
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    I read the MAX660 data sheet as giving the maximum output of 100 ma. If the load is only one op amp, the 78L05/Max660 should work fine.

    The question comes from this statement -
    If that means you have a negative voltage source, then the 79L05 will be superior to the MAX660.
     
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