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TLV9004: Is thermal pad needed electrically

Brian Smith
Prodigy 90 points
Part Number: TLV9004

Using TLV9004IRTER  with +/-3V3 rails. It is a low power application and unlikely to have thermal constraints with the thermal pad unconnected.  Will  the device will operate with bipolar rails without the thermal pad being connected if there are no effective thermal constraints?  Appreciate that thermal pad connected to V- is recommended, and can sort on re-track.  Just need guidance for prototypes which do not have the pad.....

  • +1
    Guru 244220 points

    The pad is internally connected to V– (not necessarily with a low impedance). So you must not connect it to any other voltage, but having no connection is OK.

    The pad should always be soldered; the thermal resistance depends on the amount of copper you have there.

  • 0
    Guru 140200 points

    Hi Brian,

    the datasheet clearly says:

    "The package thermal pad must be soldered to the printed circuit board for thermal and mechanical performance."

    So it's not alone for thermal reasons but also mechanical stability of soldering connections.

    Datasheet also says:

    "Connect thermal pad to V–."

    So when talking about the TLV9004 being used in an industrial product, the thermal pad should be soldered to V- Relaxed

    Kai

  • 0 in reply to Clemens Ladisch
    Prodigy 90 points

    Thank you - pad to V- is about 10k, either way round, which made me suspicious that it didn't need to be connected. Points re thermal and mechanical stability taken on board fully....just needed a work around for some prototype boards.

  • 0 in reply to Brian Smith
    TI__Guru*** 140136 points

    Brian,

    I you saying the circuit board does not have an exposed metal center pad? Meaning the footprint on the board is missing the pad.