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DRV110A-Q1: Maximum external FET gate charge

Erik Laastad
Prodigy 10 points

Part Number: DRV110A-Q1
Other Parts Discussed in Thread: TIDA-01621, DRV110

How do I calculate the max acceptable gate charge of the external FET? In TIDU584A (section 4.2.2.6) the recommendation is that the gate charge should be less than 10 nC. However TIDA-01621 use MOSFET SI7414DN-T1-E3 with 26nC max total gate charge. If a MOSFET with even larger gate charge is required, would you recommend using an external low side gate driver?

  • 0
    TI__Expert 6330 points

    Hi,

    I have notified our expert regarding this topic. Please expect a response by 9/19/19.

    Thanks,

    Aaron

  • 0
    TI__Expert 4940 points

    Hi Erik,

    FET selection depends on the system current Tr/Tf requirements.

    The typ DRV110 gate drive current is +/-15mA when Vin=15V, at lower Vin DRV 110 will have lower drivability.

    A FET with gate charge <=10nC is safe solution, depending on the application FET with gate charge greater than 10nC may work.

    This is the case for TIDA-01621, 26nC is good enough for that application.

    Regards,

    Costin