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TPS63027: Part Failures

Charles Haight
Intellectual 340 points
Part Number: TPS63027

To Whom

We are using the TPS63027 family of regulators for 3.3V & 5.0V regulation.  Out of 15 Limited Production Power CCAs, I have what appears to be two part failures.  I created a fishbone to help in the analysis.  My analysis is not complete yet.  I want to know if I can send the failed parts back to TI for analysis if final testing/analysis points to bad parts?

Charlie

  • 0
    TI__Expert 8420 points
    Hi Charlie,

    We could eventually get the units back, but before that we need to understand the design. Issues can be caused because of a bad layout, a hot plug in, or mishadling during test...etc.

    Could you share the schematic and layout ? and the operating conditions : Vin, Vout. Iout?
    I can help you review it before guessing on other possible causes.
    Could you also be more precise on what "failures" it is ?
  • 0 in reply to Sabrina
    Intellectual 340 points

    Hi Sabrina

    Failure is being defined as Vout* voltage climbing to 5.95V when the feedback circuit was set to 5.0V.  (It behaving as if it has no feedback path to regulate the Vout)  The failures were detected at 1st power on...no hot plug in and VinA* is isolated from any potential input spikes due to front end flyback power regulator circuit.  Additionally, output circuit was verified with no voltage spikes.  The attached circuit design has been running since December 2017 without a part failure.  It has been temperature tested over a 3-day cycle as part of our product test.  Schematic is below:

    Short BIO, long time user of TI parts...since the TMS32010 days!

  • 0 in reply to Charles Haight
    TI__Expert 8420 points
    Hi Charlie ,
    I don't find any obvious issues on the schematic, could you share the layout?
    What is the Vin range and the load profile?

    You could contact me at s-ramalingam@ti.com if you don't wish to share the information publicly
  • 0 in reply to Sabrina
    TI__Expert 8420 points
    Hi Charlie,

    I am continuing this discussion here.
    After reviewing the schematic and layout, I could not find issues there. Moreover you confirm there is not hot plug in that could have damaged your device.
    However, since the output voltage is going up to 5.95V, instead of regulating to 5V, there could be an open contact on FB.(eg. soldering issue and the FB voltage is too low. If replaced with a good Unit the application will work again if the soldering is ok).
    Have you done a x -ray to check soldering on the FB pin and the resistor divider on the failing board before replacing by a good unit?

    From a quality point of view, the return history of this device looks very good
    I suppose you purchased the units through distribution. To return the units to TI, you would need to contact the distributors and return the units via your distributor.
    If it was purchasing through TI sample store you can go to the following link and fill the form:
    www.ti.com/.../customer-returns.html