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TPS62090: Understanding of the SW Node

Kenji Ohno1
Genius 5095 points
Part Number: TPS62090
Other Parts Discussed in Thread: TPS62203

Hi Team,

I found Application Report SLVA494A about the rating of SW Node.

I would like to know two things.

①What is the current rating of the body diode?

　Is it the same as the SW current limit spec of the IC?

　TPS62090: max 5.5A

　TPS62203: max 670mA

②I would like to know what is the upper FET breakdown voltage.

I think the allowable undershoot is determined by the current rating of the body diode and the withstand voltage of the upper FET.

(Supply voltage - undershoot voltage is applied to the upper FET)

Best Regards,

Kenji

  • 0
    TI__Expert 7605 points

    Hi Kenji,

    Thank you for your question.

    TI doesn't share these information with the customers. However for a standard design you can consider:

    1: The current rating of the body diode to be equal to the SW current limit (the current through the body diode flows only for a short time interval, so it shouldn't cause you any problem).

    2:The allowable undershoot/overshoot to be the one indicated in Absolute Maximum Ratings in the datasheet. If in the datasheet are specified only the DC values, you shouldn't worry about the AC spikes; provided a good layout, they should be within the FET breakdown voltage. 

    Please ask again if you have any more questions.

    Thanks,

    Stefano

    All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and is subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).