• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 62 subscribers
  • Views 367 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.

BQ76972: FET driver IC necessity for low side switching with BQ76972

Divya Kumar Singh
Prodigy 70 points
Part Number: BQ76972


Tool/software:

I want to use BQ76972 for low side switching circuit. The reference manual does not specify , will it be mandatory to use external FET Driver IC for low side switching??

  • +1
    TI__Mastermind 19305 points

    Hello Divya,

    Yes, you'll need external FET drivers for low-side implementation. Please refer to Section 2.2 of the BQ769x2 FAQ which includes an application note to assist with that. This additional application note may also be useful along with the one the FAQ recommends: Multiple FETs with the BQ769x2 Battery Monitors.

    Best Regards,
    Alexis

  • 0 in reply to Alexis_H
    Prodigy 70 points

    Reference : Application Note Using Low-Side FETs with the BQ769x2 Battery Monitor Family

    Page:11  Shows driving the FETs without external driver. The application report shows examples of direct drive of the FETs with the digital outputs.

    What are the limitations of using such circuit in addition to the fact the drive output maximum voltage will be 5V/6V.

    In the subsequent pages multiple FETs are also driven as such.

  • 0 in reply to Divya Kumar Singh
    TI__Mastermind 19305 points

    Hello Divya,

    The design considerations one needs to make using DDSG/DCHG pins to drive the FETs are mostly listed out throughout the application note and depending on what you want in your system, can be seen as limitations. For example:


    Section 5 FET Driver Implementation begins showing the usage of a FET driver in the circuit.

    Best Regards,
    Alexis