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TPS62160: Device Failure on Power Up

stomp
Genius 4675 points
Part Number: TPS62160

Hi,

We purchased the last of TPS62160DGK from a popular online supplier and populated 50x boards.

Our schematic looks like:

Our PCB Layout is:

The devices have the following markings:

And the result after applying power:

We either have:

1. The schematic or Layout wrong

2. The chip soldered around the wrong way, or the markings on the device are around the wrong way.

3. Counterfeit devices

Could anyone from TI comment on the schematic or PCB layout, and also the date code and "U" symbol on the devices. Is this actually a TI part?

Thanks!

  • 0
    TI__Genius 13451 points

    Hi !

    Nancy will reply you next Monday.

    Shuai

  • 0 in reply to Shuai Fan
    TI__Mastermind 49430 points

    Hi Stomp,

    Please see my schematic and layout comments as attached. You can try the following solutions to see if they are working.

    1. Change C1 from 1uF to 10uF/25V. 

    2. Change CT1 from tantalum cap to ceramic cap 22uF/16V. The higher ESR tantalum cap may cause loop unstable

    3. I will check with the team next week for top marking to see if it is TI device.

    4. Please follow the TI layout example to update the PCB in next revision.

    TPS62160 Sch_layout review.pptx

    Hope this helps,

      Thanks,

    Nancy

  • 0 in reply to Nancy Zhang
    Genius 4675 points

    Hi Nancy,

    Thanks for your input.

    We found some TPS62160DGK devices on old prototypes and swapped them onto the existing PCB's. The devices function correctly in all instances, across our temperature, input voltage and output load ranges.

    We can only assume the devices we purchased had some issues, or maybe were not legitimate devices.

    Thanks for your help.