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LP5907: Short circuit current

Peter Xu
Expert 3225 points
Part Number: LP5907

Hi team,

My customer tested a 2A current when the circuit is shorted. The waveforms are attached. Does this current damage the device or affect the device reliability?

Best Regards,

Peter

  • +1
    TI__Mastermind 38115 points

    Hi Peter,

    Is the attached waveform showing a simulated expected normal operating condition, or is the repeated short-circuiting just a test setup? 

    In general this 2-A peak current won't damage the device. However, if the short-circuit event was repeatedly applied as in the attached waveform, there would be repeated temperature fluctuations, and I would expect that over time it could impact device reliability. If the short-circuit is only a fault condition and not a normal condition then this large peak current is not an issue.

    Regards,

    Nick

  • 0 in reply to Nick Butts
    TI__Expert 3225 points

    Hi Nick,

    My customer saw this waveform when the device runs in normal operating condition. They are still finding the reason.

    Regards,

    Peter

  • +1 in reply to Peter Xu
    TI__Mastermind 38115 points

    Hi Peter,

    The reason they are seeing a current spike that is larger than the current limit for this device is that the current limit circuit takes a finite amount of time to respond and limit the current. This is normal for many devices. 

    To clarify, what I meant in my first comment is that in the attached waveform, there is a periodic short-circuit applied to the output of the device, and if the operating conditions in their application do not have a periodic short-circuit (I would expect that they don't have a periodic short-circuit because this is a fault condition), this is not an issue from the perspective of the LDO.

    Regards,

    Nick