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TPS659037: VCC1(C7) - GND_ANA(M13) Short question

CHO SR
Genius 3185 points
Part Number: TPS659037

Hi,

As a result of checking that TPS659037 is not working, it is an internal short circuit of VCC1(C7) and CND_ANA(M13).

The customer will ask if the input voltage of 5 volts is measured during a short circuit.

Is 5V measurement normal on VCC1 pin for VCC1 and GND internal short circuit?

12V to 5V Schematic : 

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TPS6590377 Schematic : 

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  • 0
    TI__Mastermind 37030 points

    Hi, 

      I hope I understand your question properly with my answer below: 

      We don't see internal short circuit of VCC1(C7) and CND_ANA(M13) when the devices were tested in fab; and it's impossible to measure the 5V when there is a short between theses 2 pins. 

      Please let's know what's the failure rate of the short case; if it's sure it's internal shorted, please contact your local TI support for return for FA. 

    Thanks!

    Phil

  • 0 in reply to Phil Yi40
    Genius 3185 points

    Hi Phil,

    Thank you for your support.

    Only one occurred, and a short was confirmed as a result of TI analysis. (Curve Trace)

    However, the customer does not understand if the short of VCC1(C7) & CND_ANA(M13) is correct due to 5V measurement in the red part.

  • 0 in reply to CHO SR
    TI__Mastermind 37030 points

    Hi Cho,

      I'm not sure if I understand your question properly. If 5V can be measured in the red part, then looks like the short is not real "0" Ohm short. Can you read the 5V power rail current or, measure the Ohm reading between the 5V and GND? 

    Thanks!

    Phil

  • 0 in reply to Phil Yi40
    Genius 3185 points

    Hi Phil,

    5V power rail current : less than 0.1A

    5V - GND Ohm : 

    Pin Point Good Product Bad Product
    C7(VCC1) - M13(GND_ANA) 0.59MΩ 92.65Ω
    C1(OSC16MCAP) - M13(GND_ANA) 217.48KΩ 98.30Ω

    Is there a reference resistance value to judge by a short?

  • 0 in reply to CHO SR
    TI__Mastermind 37030 points

    Hi Cho,

     Can you try swapping test for the PMIC to make sure it's an internal issue of the device? 

     If it's a real internal issue of the device; would please let's know what's the failure rate of the short case; if it's a high failure issue (>100ppm), please contact your local TI support for return for FA.

    Thanks!

    Phil

  • 0 in reply to Phil Yi40
    Genius 3185 points

    Hi Phil,

    Thank you.

    As a result of FA, it was an internal short, but the 5V voltage was checked, so I asked if the short was correct.

    (QEM-CCR-2303-00067)

    I understand that the 5V is checked because it is not an actual 0ohm short circuit.

  • +1 in reply to CHO SR
    TI__Mastermind 37030 points

    Hi Cho,

      Ok; it sounds like FA was done by the "QEM-CCR-2303-00067", right? and the conclusion is "an internal short" with much lower resistance than normal. 

      For your question "if the short was correct", I don't know; but I know we don't re-spin this device anymore.

      Thanks!

    Phil