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TPS1HC100-Q1: One of VBB or one of VOUT pin is opened but another one is connected, what happen?

Yoshiki Ochi
Genius 9485 points
Part Number: TPS1HC100-Q1

Hi team, 

  • One of VBB (for example, pin-12) is opened but another one (for example, pin-13)  is connected, what happen?
  • One of VOUT (for example, pin-9) is opened but another one (for example, pin-10)  is connected, what happen?

Do they lead continuous operationn but electrical characterestic is not be granteed (such as on resistance deviation)? Or do they lead open failure mode (fully no input supply or no conncection to output) shown in table 4-3 in TPS1HC100-Q1 Functional Safety FIT Rate, FMD and Pin FMA? 

Regards,
Ochi

  • 0
    TI__Mastermind 35005 points

    Ochi-san,

    The way that this works is that there are bond wires going from the pin to the relevant part of the die where the power FET input/output are. If you only connect one pin from the input/output then all of the current that is supposed to go through two bond wire paths is now going through one bond wire path. For nominal operation this likely isn't an issue, however it would be something that could lead to failure as now twice the current is going through a sign bond wire path.

    We can't say definitively what would happen- the device should behave like normal, however if a high-current or high-power event happens on the input or output there could be a potential failure.

    As an analogy, think of this like exceeding the maximum current rating of a gauge wire. The wire probably won't be damaged- unless you are really stressing the power/current. 

    Best Regards,
    Tim