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ADP5587 SPEC. Question

Dear Sir:

ADP5587 can be used for push-pull architecture? Another AD5587  GPIO(R0~R7,C0~C7) ,If useing Open-drain or push-pull mode in system design. Each GPIO can accept the sink current is how much?

Best Regards,

Jacky

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  • Hi Jacky,

    The ADP5587 is not the best solution.  It's pulldown pins are only spec'd at 1mA.  And the pins are only rated to 4V (max).  This would be a problem if one of the LEDs was off--then the pin would be pulled up to almost 9V.

    Instead, we have several other parts that would work well:

    1.  Do you need independent control of each LED?  If not, then the ADD5205 would work very well.  It takes an input voltage of 2.7-18V and drives the LEDs at up to 100mA. 

                   http://www.analog.com/add5205

    2.  If you do need control of the LEDs, then our low voltage converters would work well.  I would recommend the ADP886x family of parts.  You can view them here:

                   http://www.analog.com/en/power-management/display-and-lighting/products/index.html

         To drive all 18 LEDs, you can use 2 ICs, or you can use ballasting resistors to parallel the LEDs, like this:

             

Reply
  • Hi Jacky,

    The ADP5587 is not the best solution.  It's pulldown pins are only spec'd at 1mA.  And the pins are only rated to 4V (max).  This would be a problem if one of the LEDs was off--then the pin would be pulled up to almost 9V.

    Instead, we have several other parts that would work well:

    1.  Do you need independent control of each LED?  If not, then the ADD5205 would work very well.  It takes an input voltage of 2.7-18V and drives the LEDs at up to 100mA. 

                   http://www.analog.com/add5205

    2.  If you do need control of the LEDs, then our low voltage converters would work well.  I would recommend the ADP886x family of parts.  You can view them here:

                   http://www.analog.com/en/power-management/display-and-lighting/products/index.html

         To drive all 18 LEDs, you can use 2 ICs, or you can use ballasting resistors to parallel the LEDs, like this:

             

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