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LMV7272: Timing Issue

Jerry Chu
Genius 4915 points

Part Number: LMV7272

Hi Expert,

If the V+ and V- voltage is fast than V+, does it possible damage the LMV7272? Thanks!

  • 0
    TI__Guru 66666 points

    Hello Jerry,

    I'm not quite sure of the question.

    Are you asking that if the V+ is brought up before V-, will it cause damage?

    Or,

    Are you asking if the inputs are brought up before V+, will it cause damage?

    Regards,

  • 0 in reply to Paul Grohe
    Genius 4915 points
    Hi Paul,
    Sorry for typo.
    If the inputs(+IN/-IN) are brought up before V+, will it cause damage?
  • 0 in reply to Jerry Chu
    TI__Guru 66666 points

    Hi Jerry,

    The inputs are protected by ESD diodes to the supplies, as shown below:

    If the inputs are higher than V+ (>500mV), the upper diodes will conduct and clamp to V+.

    The clamp current must be limited to less than 10mA (in Abs Max table). I would recommend 1mA or less.

    The current can be limited by adding a series resistance of a minimum of 1k Ohm per volt of over-voltage (or 5k minimum for 5V). This resistance can be part of any input voltage divider network.

    If this event is long-duration (>100ms) or occur as part of normal operation, external Shottky clamping diodes are recommended to take the stress off the internal ESD cells.

    Regards,

  • 0 in reply to Paul Grohe
    Genius 4915 points
    Hi Paul,
    It does make sense. Thanks very much!