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TPS2066: Reverse Current ABS max

Steve Widener
Genius 10135 points
Part Number: TPS2066
Other Parts Discussed in Thread: TPS2553

The TPS2066 allows reverse current to flow in the case where EN is held high (switch enabled) and the OUT pin is at a higher voltage than the IN pin. See the link below:

https://e2e.ti.com/support/interface/f/138/t/591270

The question is what max current is allowed? The ABS max tables in the datasheet provides guidance that the current is "internally limited" but it is not clear if that applies in the reverse direction.

Specifically, if the input is taken low through a discharge circuit (say, a couple ohms to ground) and there is a large capacitance (say 100-200uF) on the output pins, would the TPS2066 be damaged as the output capacitance is discharged backwards through the switch?

  • 0
    TI__Expert 8980 points
    Hi, Steve,

    TPS2066 can't limit current in the reverse direction. We don't have specific max allowed reverse current value, the part might be damaged if this reverse current is to high.

    Regards,
    Bob
  • 0 in reply to Bob Ma
    TI__Genius 10135 points
    Thanks Bob - we have seen failures of the device & it may be due to this reverse current. Do we have any guidance on the ABS max current for the device - perhaps based on some similar device?
  • 0 in reply to Steve Widener
    TI__Expert 8980 points
    Hi, Steve,

    I am sorry that we don't have guidance on the ABS max current. But from my understanding, we know max Operating Tj(max)=150deg, Rds(on) and thermal resistance(Theta-Ja). So I think we can estimate max reverse current(I) this way: I*I*Rds(on)*Theta-Ja+Ta<Tj(max).

    Besides, we have some parts which have reverse voltage protection, such as TPS2553. Not sure if this part can work for some of customers' application.

    Regards,
    Bob
  • 0 in reply to Bob Ma
    TI__Expert 8980 points
    Hi, Steve,

    Since no more feedback, I will close the thread for now. Feel free to ask if any further questions.

    Regards,
    Bob