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TPS2511DGN Input Overvoltage Question

David Poehlman
Prodigy 70 points
Other Parts Discussed in Thread: TPS25200, TPS2514, TPS2511

I wanted to know what the failure mode is for input overvoltage, in great detail down to the gate level if possible. I want to make sure if this chip goes overvoltage it will not propagate to a users PED.

  • 0
    TI__Mastermind 42795 points
    When the TPS2511 is enabled, OUT will follow IN. So, if IN has an overvoltage that does not cause the switch to turn off then that voltage should get passed downstream to the PED. If the application requires a switch with more protection, consider the TPS25200 with OVP and OV clamp along with TPS2514.
  • 0 in reply to Eric Wright
    Prodigy 70 points
    We have tested 6 units using this device with 32VDC input. All 6 failed without passing voltage. I would like to understand the physics of failure of an overvoltage condition to the TPS2511 as the response is not consistent with our test results. The minimum failure voltage the TPS2511 can see in circuit is 10VDC and the maximum is 32VDC. Please evaluate the overstress condition of 10-32VDC using physics of failure to let us know why our test results are inconsistent from the response. We are trying to see if we need to put an additional protection in circuit to prevent an input to output pass condition. Your assistance is appreciated.
  • 0 in reply to David Poehlman
    TI__Intellectual 2795 points
    It is difficult to see there is any consistent because we only can gurantee the spec clalimed in the ABS maxium rating. Because so many block diagram connect to VIN, different chip mabye has different weak point. So as Eric suggestion, if can see any over spec voltage in your application, recommend use TPS25200 (input withstand up to 20V) + TPS2514
  • 0 in reply to Eric Wright
    Prodigy 10 points
    Hi. When you say "if IN has an overvoltage that does not cause the switch to turn off", can you expand on that at all? Can you provide any information on why an overvoltage would or wouldn't cause the switch to turn off?
  • 0 in reply to Dan Gunter
    TI__Mastermind 42795 points
    My basic point was that beyond the ABS MAX of TPS2511 IN pin, the failure mechanism is unpredictable. TPS2511 could fail in such a way that the internal FET could be turned off such that the IN over-voltage was not passed to the OUT pin. But, either way the fail mechanisms are not predictable nor defined when the application circuit exceeds the ABS MAX ratings of TPS2511.