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Original question:

TPS61070: TPS61070DDCR SW pin short to GND

TPS61071: TPS71071 "SW pin short to GND”

Akihisa Tamazaki
Genius 10865 points
Part Number: TPS61071

Hello team,

My customer is using TPS61071DDCR.

Recently, under production in their factory,  TPS61071 has failure which is “SW pin short to GND”.   The failure rate is 5 /100 units (5%)

I found the similar information from E2E forum, and the answer is that important thing is layout.

https://e2e.ti.com/support/power-management/f/196/t/587881

https://e2e.ti.com/support/power-management/f/196/t/582513

 

Now we do not know which overshoot or ESD caused “SW pin short to GND”.

And, when checking the overshoot at switch node with TPS61070EVM, it seems that the voltage at switch node exceed to 7V(absolute maximum).


In this situation, I would like to know that what overshoot voltage at SW pin TPS61071 can allow? 

 

It may be simple question. Would you please advise?

Best Regards,
Akihisa Tamazaki

  • 0
    TI__Mastermind 21565 points

    Hi Akihisa:

    Thanks for asking. Yes, the layout is important for switch power.  Please share the layout with us so we could help to check together.

    Besides, what's your Vin range, Vout and load condition?   

    "And, when checking the overshoot at switch node with TPS61070EVM, it seems that the voltage at switch node exceed to 7V(absolute maximum)."

    May you also share the waveform? As I did some test before, and didn't find it. (Sorry that these days I'm out of lab with no EVM in hand.)

  • 0 in reply to Minqiu Xie
    TI__Genius 10865 points

    Minqiu-san,

    Thank you for your comment by offline email.

    Best Regards,
    Akihisa Tamazaki