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TPS81256: Operation at 90C Ambient Temp

Antonio Fadhel
Genius 9410 points
Part Number: TPS81256

Hi,

My customer is planning to use the TPS81256 for a 3.3V to 5V @ 440mA Ioutmax application. The device will be sealed in an enclosure with no airflow so there is a chance the Ta will increase beyond 85C (they estimate up to ~90C). Do you see any issues with this? I see that the datasheet recommends a Tj of 110C for max power operation, and with very rough calculations it seems like they will be right around that junction temp at max power and 90C Ta. They are also operating well below the max switch current of the device.

Please let me know your thoughts. It would be great if there is any derating data for Tj higher than 110C.

Thanks,

Antonio

  • 0
    TI__Guru 68335 points

    Hi Antonio,

    The max operating Tj=150C, and the recommended Tj=125C,  according to the datasheet, so it does not exceed the datasheet recommendations.  Hence no derating is needed if your calculated Tj=110C.  

    Best Regards,

    Youhao Xi, Applications Engineering