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TPS73033 issue: output is abnormal

Jin Ruan
Prodigy 250 points

Hi,

I'm using TPS73033 device, the input voltage for TPS73033. after solder, we found there are several issues.

1. The output is equal to input 5 V for some devices.

2. There is no output for some devices.

3. The output is 1 V for some devices

4. The output is 2 V for some devices.

 

Is there any guideline to debug these issues?

 

Regards

 

Jin

  • 0
    TI__Guru 55940 points
    Hi Jin,

    There are a couple of things that should be verified. When you do a visual inspection, do you see any shorts? I would also look for any unintentional leakage paths with flux. These are the most likely causes of so many different voltages.

    Very Respectfully,
    Ryan
  • 0 in reply to Ryan Eslinger
    TI__Prodigy 250 points

    Hi Ryan,

    I tested the IO pins and didn't find shorts on any IO. But when I configure the device into shut down mode ( EN is configured as GND ),  the current is about 2 mA.

    According to the datasheet, the leakage current is several uA.

    It seems there are some shorts internally.  Has this issue been reported by any user?

     

  • 0 in reply to Jin Ruan
    TI__Guru 55940 points
    Hi Jin,

    We test our devices before shipping and I am unaware of any similar issues reported before.

    The increased shutdown current is another indicator that there are unintentional leakage paths or shorts on the board.

    Very Respectfully,
    Ryan