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CSD18543Q3AT MOSFET

tareq awed
Prodigy 30 points
Other Parts Discussed in Thread: CSD18543Q3A, CSD16340Q3, CSD16323Q3, CSD16327Q3, CSD17304Q3, CSD17308Q3, CSD17309Q3

Hello,

We used this Mosfet (CSD18543Q3AT) for one of our designs, in the datasheet the Gate-to-source threshold voltage is 1.7V. Our control circuit provides 2.8V as a gate to source voltage, but we noted that there is a voltage loss of 1V across the Mosfet at the entire current range and the MOSFET will be heated. do you have any solution for limiting the voltage loss across the MOSFET without changing the control circuit? 

Best regards 

  • 0
    TI__Mastermind 34370 points

    Hello tareq,

    Thanks for your interest in TI FETs. The CSD18543Q3A on resistance is specified at a minimum VGS = 4.5V. You must provide VGS >= 4.5V or we cannot guarantee the on resistance of the FET. As can be seen in the rds(on) vs. VGS curve on page 1 of the datasheet, rds(on) increases exponentially when VGS < 4.5V. I'm afraid I don't have a quick fix unless you have 5V available to drive the gate of the FET. Can you use a FET with lower maximum VDS rating such as 25V or 30V? TI has one 25V FET in the same 3x3 SON package, CSD16340Q3, that has on resistance specified at VGS = 2.5V. We have a number of 25V and 30V FETs with on resistance specified at VGS = 3V. A listing is provided below.

    CSD16323Q3
    CSD16327Q3
    CSD17304Q3
    CSD17308Q3
    CSD17309Q3