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TPS25982: TPS25982 internal structure Issue

Guangyan Liu
Intellectual 2130 points
Other Parts Discussed in Thread: TPS25982

Dear Team

Thank you for your help

My customer ask the query that , they test the TPS25982 device pin , Pin17 to Pin24 are all output , pin19 to Pin24 are shorted with each other , but Pin17、Pin18 not.

The same issue happened in GND , Pad2 and Pin5、Pin14  short with each other ，without Pin4 .

Does the internal structure cause this happen?

Best regards

Leon.liu

TI Customer Support Center

  • 0
    TI__Guru 57737 points

    Hi Leon.liu,

    Can you please comment on the below questions,

    • How did you test the pin shorts between each pins ?
    • Have you checked the potential difference between each pin when powered up ?
    • Do you see any issue with the device ?
    • How many devices have you tested ?
  • 0 in reply to Praveen GD
    Expert 2470 points

    Hi,

    Same problem,

    1. We use the buzzer of the multimeter to test whether two pins are short connected;

    2. There has been no test of power supply;

    3. No other problems were found when the power was not tested;

    4.We tested two IC.

    Thanks!

  • 0 in reply to Neal Zhu
    TI__Guru 57737 points

    Hi Leon.liu, Neal Zhu,

    I don't think it is a problem. 

    All the pins of the IC with the same name need not be shorted internally directly. For example, the thermal PAD of most of the IC's is named as GND but in reality, it is not connected to GND internally but it has the same potential as GND i.e. 0V. 

    I would recommend you to test the IC when powered up and check the potential of each pin rather than checking the connectivity between the pins when the IC is disabled.

  • 0 in reply to Praveen GD
    TI__Guru 57737 points

    Hi Leon.liu, Neal Zhu,

    I have checked the internal structure of the TPS25982. Your observations are inline with what is expected.

    So, there is no issue in what you are observing.