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TPS61071-Q1: SW pin shorted to ground issue

Kaji@PAN
Mastermind 7465 points
Part Number: TPS61071-Q1

Tool/software:

Hello,

I am an FAE at a distributor that handles TI products.
I asked about the issue of the SW pin being shorted to ground in the following thread.
I received a follow-up question from my customer.

The symptoms of the circuit are as follows.
A voltage (about 7.7V, 20us to 50us pulse) exceeding the absolute maximum rating (7V) was applied to the SW pin.
(Question 1)
Shouldn't the absolute maximum rating be exceeded, even for a momentary pulse (overshoot) of 20us to 50us?
If the rating is exceeded, will it only affect the product's lifespan, or will it immediately lead to electrical destruction?
(Question 2)
If there is a margin for the absolute maximum rating, I would like to know how much it is.
(Question 3)
What kind of failures are possible if the absolute maximum rating is exceeded?

Best regards,

e2e.ti.com/.../tps61071-q1-sw-pin-is-shorted-to-ground

  • 0
    TI__Expert 7695 points

    Hi Kaji,

    A voltage (about 7.7V, 20us to 50us pulse) exceeding the absolute maximum rating (7V) was applied to the SW pin.
    (Question 1)

    There are risks that this will affect IC reliability and even damage some pieces


    Shouldn't the absolute maximum rating be exceeded, even for a momentary pulse (overshoot) of 20us to 50us?
    If the rating is exceeded, will it only affect the product's lifespan, or will it immediately lead to electrical destruction?
    (Question 2)

    It might be different for different pieces. Some pieces may damage and some may last for a longer while. But in conclusion, we don't support this voltage.


    If there is a margin for the absolute maximum rating, I would like to know how much it is.
    (Question 3)

    There's margin for <1ns pulse voltage, but 20us is long enough for a MOSFET and should be regarded as a DC voltage stress. The DC permissive voltage is 7V. Most pieces may have higher permissive voltage but there will be pieces that distributes at 7V

    Best Regards,

    Travis

  • 0 in reply to Travis Wang
    Mastermind 7465 points

    Thank you for your reply.
    I would like to ask again about Question 3.
    If the absolute maximum ratings are exceeded, what symptoms of failure can be expected?
    In this case there is a short circuit, but are there any other symptoms that can be considered?
    Best regards,

  • +1 in reply to Kaji@PAN
    TI__Expert 7695 points

    There might be short to GND or more leakage current than expected. Or for some pieces might be normal at first but the IC life will be affected.