• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 232 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ76930: REGIN'S Step Down FET Damage

user5119225
Prodigy 10 points
Part Number: BQ76930
Other Parts Discussed in Thread: BQ76940,

I see the bq76930 demo,the REGIN PIN use a external FET. The G pole of FET is connected to the fifth battery. The actual voltage of the fifth battery can be up to 25V. The maximum voltage of FET GS is 20V.Will this application cause damage to the FET？I've seen BQ76940, and I've seen cascading applications of BQ76930, and that's what they did.

Is this usage wrong？

If there are risks, how do You use REGIN's Step Down FET?

  • 0
    TI__Guru 54715 points

    Hi User,

    The connection is a source-follower circuit or common drain amplifier, consult your favorite electronics reference for more information on its operation. The circuit is generally fine, if needed for your situation you can add a zener across the gate-source, it should never conduct except in the case of a severe transient where you are concerned.