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TLV9034-Q1: output current for MOSFET gate

Mehdi Abdelmoula
Prodigy 45 points
Part Number: TLV9034-Q1
Other Parts Discussed in Thread: UCC44273, UCC27517

Hello, 

I want to use TLV9034-Q1 to drive 4 different MOS gates. 

I want to use full range of output current available for sinking and sourcing (apparently 90-100mA according to datasheet), without any gate resistor.

Is this kind of design acceptable ? According to you, would there be a risk for the driver not to add a resistor in front of gate ? 

Thank you for your help.

Best regards, 

Mehdi Abdelmoula

  • 0
    Guru 255560 points

    The SQ4850 has a gate capacitance of about 1 nF.

    The TVL9034-Q1's absolute maximum ratings forbid output short circuits longer than 10 s, and warn of damage due to heating. So you need to add a gate resistor. (If you need to switch quickly, add a gate driver like the UCC27517/UCC44273.)

  • 0 in reply to Clemens Ladisch
    TI__Genius 11681 points

    Hi Mehdi,

    I agree with Clemens. We do not recommend operating anywhere near the short circuit current limit. 1 nF cate capacitance right on the output of the comparator could continuously strain the output when it discharges and could eventually cause damage. We highly recommend a series resistor to limit the capacitor discharge current.