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TPS7A16: What happens to TPS7A1650 device if one of the pins had been open from PCB ?

Went Cao
Genius 5550 points
Part Number: TPS7A16

Dear all

        What happens to TPS7A1650  device if one of the pins had been open from PCB ? 

        As below is our sugessing , please help me to check " Potential Failure Phenomenon ", and redress them, Thanks a lot.

  • 0
    TI__Mastermind 43630 points

    HI Went,

    Some minor suggestions:

    1. If the PG pin is open and used in the application, the device will always appear to indicate that the Power is Good (PG).

    2. Similarly if the Delay is open, the impact is that there will be no delay from VOUT rising to PG asserting.

    For completeness, I think you should also consider the thermal pad. If Open, the device may go into thermal shutdown under certain operating conditions.

    I hope this helps.

    Regards,

  • 0
    TI__Mastermind 29320 points

    Please see my reply below:

    1. If you leave the output pin open (no connect), you will not see power applied to the PCB.
    2. If you leave the power good open (no connect), there will be no impact to the functionality of the linear regulator.
    3. If you leave the ground pin open (no connect), there will be a high impedance from the GND of the linear regulator and the input supply. Therefore the linear regulator will not receive power or produce power.
    4. If you connect the GND pin of the linear regulator to the same potential as the IN pin, there is effectively 0V from IN to GND and the regulator will not power on or produce any output voltage.
    5. If you leave the EN pin unconnected, it will be a high impedance and the linear regulator may or may not turn on. I have requested an eval board to evaluate this, however it will not arrive for another week so my reply will be delayed.
    6. If you leave the DELAY pin unconnected, the linear regulator output voltage will not be impacted.
    7. If you leave the IN pin unconnected, the linear regulator will not receive power and will not turn on. However you may exceed the maximum rating of the linear regulator if power is still applied to the EN pin, which may degrade or damage the part. Please see table 6.1 for Absolute Maximum Ratings information.

    Thanks,

    - Stephen

  • 0
    TI__Mastermind 29320 points

    Hello Went,

    The impedance of the enable pin to ground, while the LDO is unpowered, is approximately 3.8 megaohms.

    If the enable pin is left floating while power is applied to the LDO, the voltage on the enable pin was measured as 20mV.

    Thanks,

    - Stephen