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TPS709: Can the output be short-circuited temporarily?

Lauren Mayfield
Expert 7925 points
Part Number: TPS709

HI,

I' posting this question on behalf of my customer.

We have a TPS70933DRVR supplying the 3.3V rail. We need to manually short circuit the output briefly (0.1s) via a relay on our automated test and assembly line in order to reset the PCB. Is there danger to shorting the output like this? This IC has short circuit protection via thermal limiting but TI has expressed concerns about doing this in the past when we asked. https://e2e.ti.com/support/power-management/f/196/t/610120 The difference is that that IC did not have thermal shutdown and the one we are using now does.

The TPS70933DRVR input should be on battery power in the range  7.6 – 7.9 volts. We also do not have the option to use the EN pin as we are already in MP on the PCB.

Thanks!
Lauren

  • 0
    TI__Mastermind 23361 points

    Hi Lauren, 

    As TPS709 has thermal Shutdown and overcurrent protection, having the output pin shorting to ground for a 0.1s should not break the part. The typical thermal shutdown temperature for this device is around 158C and as long as this device is not constantly entering/exiting from the thermal shutdown at high temperatures, it should not be a problem.

    Regards, 
    Jason