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LP3985: Shut down if Vin > abs max?

Yee Yong Teo
Expert 4335 points
Part Number: LP3985

Hi,

Recently my customer tested the LP3985 with Vin > abs max, let's say 7V. He noticed that the device will shut down. If 7V is reduced to 5V, the device works again. Is this part of the protection and is a confirmed feature for LP3985? I couldn't find this in the datasheet.

Thanks.

- YY

  • 0
    TI__Mastermind 43630 points
    HI YY,

    Anytime you go above the absolute maximum voltage, you risk permanently damaging the device.

    I am not sure of the test conditions for the above test, but is there any chance it went into thermal shutdown?

    Regards,
  • 0 in reply to JCHK
    TI__Expert 4335 points
    Hi John,

    I suspect that too initially. But that test was carried out without load. So, I can't be sure it is the thermal shutdown. Anyway, I just want to confirm the availability of this protection feature. Is it a Yes or No?

    - YY
  • 0 in reply to Yee Yong Teo
    TI__Mastermind 22610 points

    "... Is it a Yes or No? ..."

    No. There is no over-voltage protection feature in the LP3985.

    Do not mistake this particular device behavior as a 'protection feature', it's not.

    Be aware that any LP3985 device subjected to Vin>6.5V when the EN pin is connected to the IN pin should probably be considered 'walking wounded' as the EN internal structure (metallization) is probably damaged.