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CSD22205L: Inquiries regarding the use of CSD22205L

Grady Lee
Genius 4405 points
Part Number: CSD22205L


Hi, TI expert.

Customer is currently using ON-SEMI's FDD306P, and I'm going to review TI's CSD22205L.

FDD306P-D.pdf

The specs actually used in the board by the customer are as follows.

- Use Spec: Voltage - 4.3V / Current - 4A

Q1) It is judged that it can be used according to the spec on the datasheet, but since the package of CSD22205L is small, I would like the customer to check again whether there is any problem even if it is applied to the spec for use.

Q2) The maximum rating on the datasheet is -7.4A, but how many A can it actually be used?

Q3) Are there any precautions such as widening the pattern when applied to PCB?

Please Check. Thank you.

  • +1
    TI__Mastermind 39690 points

    Hello Grady,

    Thanks for your interest in TI FETs. Please see my answers to your questions below.

    1. The CSD22205L should be able to support 4A continuous current. Maximum power dissipation for this FET is about 0.5W. The conduction loss at 4A with VGS = 4.5V is 158mW at 25°C (184mW at 100°C) and with VGS = 2.5V is 240mW at 25°C (279mW at 100°C).
    2. The continuous current rating in the datasheet is a calculated value. I have included a link below to a blog that explains how TI test and specs continuous current for our FETs.
    3. Please follow the PCB footprint recommendations in the datasheet and maximize the copper around the FET connected to the drain and source pads.

    http://e2e.ti.com/blogs_/b/powerhouse/archive/2015/05/25/understanding-mosfet-data-sheets-part-3

    https://e2e.ti.com/blogs_/b/powerhouse/archive/2019/10/29/selecting-the-right-power-mosfet-power-block-package-for-your-application

    Obviously, the competition's device is much larger with greater power dissipation capability and lower thermal resistance. Please let me know if you have any additional questions or need more information.

    Best Regards,

    John Wallace

    TI FET Applications