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TPS7B4253-Q1: TPS7B4235 Over current protection: heat up?

Christian Willschek90
Prodigy 715 points
Part Number: TPS7B4253-Q1

Hi Team,


I want to know how the over current protection works. In case of a temporary over current event (800mA for 5ms), will the device heat up?

Or is it more like an internal switch, so no energy will be burned in the device?

Thanks

  • 0
    TI__Guru 55940 points

    Hi Christian,

    When an over current event occurs, the current limit for TPS7B4253-Q1 will engage.  The current limit will reduce the output current; however, sustained over current events (or operating in current for sustained periods of time) can trigger thermal shutdown and effect the device reliability.

    Very Respectfully,

    Ryan

  • 0 in reply to Ryan Eslinger
    TI__Prodigy 715 points
    I see.
    Can you quantify the heat up in that case? Do you have data, that shows the thermal impedance/resistance in a over current event?
    This will help to determine the time until the thermal shut down triggers.
    Thank you very much
  • 0 in reply to Christian Willschek90
    TI__Guru 55940 points

    Hi Christian,

    The thermal resistance is provided in the Thermal Information table of the datasheet.  Please note that your board layout and application specific information such as ambient temperature and air flow will impact how heat well heat can be be removed from the LDO.

    Very Respectfully,

    Ryan