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CSD16301Q2: Can CSD16301Q2 support this laser,whose operating voltage is only 1.2V?

user5811580
Intellectual 700 points
Part Number: CSD16301Q2
Other Parts Discussed in Thread: CSD13380F3

The parameters of the laser is listed as below.

I want to use CSD16302Q2 as a switch to this laser.

Is there any solution?

  • 0
    TI__Mastermind 32275 points

    Hello Wu Shi,

    Thanks for your interest in TI FETs. The CSD16301Q2 should work for your application but it may be overkill for the current, 120mA max, based on the laser diode specs. Are you using the FET as a low side load switch with the source grounded? Or, is it a high side load switch with the source floating? The low side switch is easier to drive as the gate needs to be driven high to turn on the FET. For the high side, the gate must be driven higher than the supply (drain) voltage to turn on the FET. We have an excel-based load switch tool at the link below. You can enter your requirements and compare up to 3 different TI FETs for power loss, package and price. I assumed your input voltage is 5V and gate drive voltage is 3V. The CSD13380F3, 12V FemtoFET, looks like may be a good fit. These are tiny LGA chip scale devices with no plastic packaging. It's a silicon die with lands for interconnect. We have many other alternatives that should work as well.

    https://www.ti.com/tool/LOAD-SWITCH-FET-LOSS-CALC

    Best Regards,

    John Wallace

    TI FET Applications

  • 0 in reply to John Wallace1
    Intellectual 700 points

    Yes, I'm going to use CSD16301Q2 as a low side load switch with the source grounded.

    However, according to the spec of the laser, the voltage of drain should be only 1.2V.

    Does CSD16301Q2 support the voltage of Vgs being 1.2V?

  • 0 in reply to user5811580
    Intellectual 700 points

    Does CSD16301Q2 support the voltage of Vds being 1.2V?

  • 0 in reply to user5811580
    TI__Mastermind 32275 points

    Hello Wu Shi,

    The CSD16301Q2 can operate with Vds = 1.2V. However, the minimum gate-source voltage where on resistance is tested and specified is Vgs = 3V. Below this, TI cannot guarantee the on resistance of the FET. Also, the maximum specified threshold voltage, Vgs(th) = 1.55V which is greater than 1.2V. You will need Vgs >= 3V to guarantee operation of the CSD16301Q2. The CSD13380F3 has on resistance specified down to Vgs = 1.8V, which is the lowest value for all of our NFET devices. We do have PFET devices with on resistance rated down to VGS = -1.5V.

    Best Regards,

    John