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CSD88537ND: CSD88537ND turn-on gate voltage

Mohan Gurunathan
Intellectual 500 points
Part Number: CSD88537ND

Hello,

I want to use CSD88537ND  in a new design.  I am driving it with a gate voltage driver which guarantees a minimum drive level of Vgs = 5.1V (or higher).   From the CSD88537ND datasheet, I cannot clearly tell if it will be guaranteed to be in the "ON" state with a gate drive of 5.1 Volts (across all devices and full temperature range).

Can TI tell me whether CSD88537ND  will be guaranteed "ON" at Vgs = 5.1V, and what will the worst-case (i.e highest) Rdson be in this situation?

Thank you,
Mohan

  • 0
    TI__Mastermind 31865 points

    Hi Mohan,

    Thanks for your interest in TI FETs. The CSD88537ND on resistance is specified to a minimum VGS = 6V. TI cannot guarantee on resistance at VGS = 5.1V. We do not recommend operating the device with VGS < 6V. The rds(on) vs. VGS curves on the first page of the datasheet show that VGS = 5.1V is on the steep part of the curve where on resistance increases exponentially. These curves are for a typical device and small variations in threshold voltage can result in very large changes in on resistance. In order to guarantee on resistance, you must drive the FET with VGS >=6V.

  • 0 in reply to John Wallace1
    Intellectual 500 points

    Hi John,

    Thank you very much for the clear answer.  Before you wrote, I was tempted to use the FET with Vgs=5.1V, but after your response I am clear that this situation would be too marginal.  So, I will find a different solution.  Thank you again!

    Best regards,

    -Mohan