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AWR1642: Why AWR1642 power rail 1.2V cunrrent increase 150mA at high temperature

Wesley He
Expert 6205 points
Part Number: AWR1642


Hi team,

Customer has a question about the 1.2V power rail current.

When testing AWR1642 in 25 deg, the current of 1.2V is 510mA. When testing AWR1642 in 85 deg, the current of 1.2V goes to 670mA, and now the Tj of AWR1642 is 120 deg.

Question: Why the current of 1.2V power rail will increase 120mA at high temperature? Did you have any software solution that can decrease the TJ?

Thanks.

Regards,

Wesley

  • 0
    TI__Guru**** 150954 points
    Hi,

    We are checking for similar test with our characterization team

    thank you
    Cesar
  • 0
    TI__Mastermind 31285 points
    Hello Wesley,

    150mA current increase at high temperature is completely normal, and similar to what we have seen in characterization.

    The Tj is going to be directly related to the power consumption and the heat sinking capabilities of the board. In order to reduce Tj you will need to either reduce the power consumption of the device or increase the heat sinking capabilities of your PCB/system. You can lower the duty cycle, reduce the number of tx/rx, reduce tx output power, etc in order to reduce the overall device power consumption. We do not have any custom software designed to reduce the Tj, this will need to be done by modifying their sensor configuration and/or PCB.

    Regards,

    Adrian
  • 0 in reply to aozer
    TI__Expert 6205 points

    Hi Adrian,

    Thanks for your reply.

    Could you please point out where I can find these description in datasheet?

    What's the current range that's acceptable for each power rail?

    Thanks.

    Wesley

  • 0 in reply to Wesley He
    TI__Mastermind 31285 points
    Hello Wesley,

    This data is not described on the datasheet and is only part of our internal characterization of the device. We do not have a spec for device current vs temp.

    Regards,

    Adrian
  • 0 in reply to aozer
    TI__Expert 6205 points

    Adrian,

    Thanks for your support.