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TPS7A90: Operation under FB-to-GND Short Failure

Kazuki Itoh
Genius 11060 points
Part Number: TPS7A90


Hi team,

Could you let me know how the TPS7A9001 works under FB-to-GND short failure?
My customer told me that the device needs to pass the adjacent pin short test, which makes sure the catastrophic failure doesn't happen under adjacent pin short condition.

My customer concerns FB-to-GND short condition.
Could you let me know how the device will operate under the FB-to-GND short condition?

Does it trigger internal current limit, and then trigger the thermal protection in the end?
Do you have any idea to avoid outputting overvoltage (5V-Vdo) under this condition?
The input voltage is 5V and the output voltage is 3.3V.

Best regards,
Kazuki Itoh

  • +1
    TI__Guru 50025 points

    Hi Itoh-san,

    FB-to-GND short will result in the input voltage being passed to the output. I have seen customers use a Zener diode on the output (say 3.6V or 4.2V breakdown for 3.3V output) to help with an issue like this. In this case the supply voltage will be clamped to avoid overvoltage, and then the TPS7A90 will still limit the current. 

    Regards,

    Nick