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DRV8323R: Use DVDD or external 3.3v to power pull up resistor of DRV8323RH?

Long Pham Tan
Intellectual 381 points
Part Number: DRV8323R
Other Parts Discussed in Thread: LMR16006,

Dear, MD support team,

I am designing Motor control board, I use DRV8323RH (hardware interface) for gate driver but I have some concerns below:

1, With configuration pins of DRV: MODE, IDRIVE, VDS, GAIN ,  I see that the datasheet recommended using DVDD  (3.3V - 30 ma) to supply pull up resistor for these pins, but when I see some reference - board, I see that these pins are pull up with external 3.3V or 3.3V from buck regulator ( like BOOSTXL-DRV8323RH), So which is better? and why?

2, DRV8323RH has a buck regulator  (LMR16006),  if I don't need the function of this regulator, Is that ok I left unconnected for pins: VIN, SHDN_N, CB, SW,FB,NC of regulator ?

Thanks,

  • +1
    TI__Expert 3535 points

    Hello,

    1. I wouldn't say that either option is better or worse. This just gives the user an option to use DVDD to supply the pull ups, or use an external 3.3V. Dependent on the system, the user may choose to use either DVDD as a pull up or an external PSU.

    2. The DRV8323R devices integrate a 600-mA buck regulator that can be used to power an external controller or other logic circuits. The buck regulator is implemented as a separate internal die that can use either the same or a different power supply than the gate driver. So yes, you can leave those pins floating if you don't need the buck.

    Thanks,

    Michael