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TPS7A89: Recommended PCB Area for Heat Dissipation

Kazuki Itoh
Genius 9175 points
Part Number: TPS7A89

Hi team,

Could you please let me know how to calculate recommended PCB area?

IN1 = 3.6V, OUT1=3.3V/1A

IN2 = 3.6V, OUT1=3.3V/1A

Tamb = 60C, No air flow.

Also, could you please tell me the detail of the "JEDEC-standard, high-K" condition on the datasheet?

Regards,

Itoh

  • 0
    TI__Mastermind 29350 points

    Hi Kazuki,

    As current flows through the PCB copper, the temperature of the PCB will go up.
    It is common to design traces or planes in a PCB to support a predefined temp rise.

    20 degrees Celsius is a common number to design to.
    IPC-2152 is a good international standard to use as a reference.
    The relevant data and an example is given in the Texas Instruments reference, "Analog Engineer's Pocket Reference".
    You can find this reference in the following link.  Please refer to pages 57-59.
    Please note that you will need the copper thickness before you can do this design analysis.

    https://www.ti.com/seclit/ml/slyw038c/slyw038c.pdf

    TI has written a quality Application Note on thermal performance for the linear regulators.
    Please review it and let us know if you have any further questions.

    http://www.ti.com/lit/an/slvae85/slvae85.pdf

    Thanks,

    - Stephen