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TPS4H160-Q1: TPS4H160 Maximum output current

Alexandre BALDINO
Intellectual 520 points
Part Number: TPS4H160-Q1

Hello,

I'd like to know what's the maximum nominal load current with this quad-channel switch please.

In the datasheet, it is written 2,5A in RECOMMENDED OPERTAING CONDITIONS, but I'd like to be sure this value stands for "per channel".

Thank you,

Best regards

Alex

  • 0
    TI__Mastermind 28190 points

    Hello Alex,

    Yes 2.5A is per channel but the thermal must be considered. One channel can drive 2.5A and the device max power losses in this case is Ron x square(load current). Ron max at 150C junction temperature is 280mOhms. The max power losses is 0.28 x square(2.5A) = 1.75W and the temperature difference between junction to ambient is 1.75W x 32.7C/W = 57C. The junction temperature max is 150C. So if only one channel drives 2.5A, the max ambient temperature is 150C - 57C  = 93C.

    If all channels are on and each drives 2.5A, the total power losses is 4 x 1.75W = 7W and the the temperature difference between junction to ambient is 7W x 32.7C/W = 229C. The device can not work in the temperature range of -40C to 125C and will go in thermal shut down immediately.

    I hope this answered your question.

    Regards

  • 0 in reply to Mahmoud Harmouch
    Intellectual 520 points
    Thank you Mahmoud!
    I suppose it depends also on the pcb area used for thermal dissipation, and you may have considered the minimal area.
    Best regards