Power dissipation data for "AD8604" and "AD8601" required

Hi 

We are using the parts "AD8604ARZ-REEL7" and "AD8601WDRTZ-REEL7" in our design. We are calculating their power dissipation for Thermal analysis.We could not able to find the data in the datasheet.Kindly help us with their power dissipation under minimum,maximum and typical conditions. Also please specify the RθJB - "Thermal resistance between Junction to Board(°C/W)" 




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[edited by: JValeriani at 8:33 PM (GMT 0) on 3 Oct 2019]
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    •  Analog Employees 
    on Sep 25, 2019 7:30 AM over 1 year ago

    Hi Vishal A,

    With regards to power dissipation of the I.C. here is an interesting article that would be useful for this kinds of problems: https://www.analog.com/en/technical-articles/data-sheet-intricacies-absolute-maximum-ratings-and-thermal-resistances.html 

    Now, going back to your question. According to the article, the power dissipation could be calculated using the formula:

    Power Dissipation = (Isy * Vsy) + ILoad * (Vsy - Vout)

    For Example:

    If we are operating the AD8604 in a buffer configuration with a supply of +5V and GND, with a load resistor of 10k, and an input voltage of 2.5V then the calculation would be:

    Isy =  Supply Current per Amplifier (from the datasheet) = 1500uA

    Vsy = Supply Voltage = +5V

    Vout = 2.5V

    ILoad = 2.5V/10k = 250uA

    Therefore the power dissipation of the AD8604 would be: Pd = (7.5mA) + 250uA * (5 - 2.5) = 8.125 mW

    Since, the AD8604 is a quad operational amplifier, the total power dissipation is: 8.125 mW * 4 = 32.5 mW

    Now, since the AD8601 is just a single op-amp then the power dissipation is just 8.125 mW

    Regards,

    Donnie

  • 0
    •  Analog Employees 
    on Oct 1, 2019 11:14 PM over 1 year ago in reply to dcruz

    Hi Vishal A,

    Just a follow up. The junction to board thermal resistance of the AD8604/8601 is 51°C/W

    Regards,

    Donnie

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