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TPS62293: Short observed in I/P and O/P of the IC

Nirmal Kumar
Prodigy 20 points
Part Number: TPS62293

Hello TI,

We are using TPS62293DRVR part on our power regulator section of the product. For your information, Vin = 5V, output voltage = 1V8, maximum load current requirement = 500mA. we have received customer complaint and take the boards for analysis, and observed the TPS62293DRVR input and output section shows short. Pin1-Pin6 = 2ohms short and Pin5-Pin6 = 50ohms short observed.

Is there any possible to share the probable cause of the IC short.

MFG part No: TPS62293DRVR

  • 0
    TI__Mastermind 21580 points

    Hi Nirmal,

    The Vin to GND and SW to GND shorts indicate the internal high and low side power FETs are damaged. The are typically damaged when there are input voltage spikes above the ABS max ratings of the device. 

    Could you monitor the input voltage to the TPS62293 to see if there are any spikes during certain application conditions? 

    What is the failure rate? How long have the devices been in the field before failure?

    If possible could you share the schematic and layout?

    Best regards,

    Varun

  • 0 in reply to Varun John
    Prodigy 20 points

    Hi Varun,

    Thanks for the quick respond,

    Could you monitor the input voltage to the TPS62293 to see if there are any spikes during certain application conditions? 

    Comments: We have verified the components input and output and we doesn't observed any spikes during the functional process in another working cameras.

    What is the failure rate? How long have the devices been in the field before failure?

    Comments: we have received a complaint on only one camera and customer is reported on out of box failure.

    If possible could you share the schematic and layout?

    Comments: 

    In further, if you required the sample. we will ship the sample to you for analysis. we would required the probable cause for the failure. It will help to lead the analysis for further process.

  • 0 in reply to Nirmal Kumar
    TI__Mastermind 21580 points

    Hi Nirmal,

    Thanks for the additional information. It's possible to run a failure analysis at TI. To do this you would have to submit a request here https://www.ti.com/support-quality/additional-information/customer-returns.html

    In case the units were directly purchased from TI, you would be able to submit the request. In case it was procured via a distributor, the distributor would have to file the return.

    The reason for these kind of failures is typically VIN spikes. It may be difficult to catch / reproduce them. A damped LC filter on the input can be added to filter out the spikes. Please refer to this app note on how to design a filter https://www.ti.com/lit/an/slvafe0/slvafe0.pdf

    Best regards,

    Varun