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CSD17527Q5A: Current Rating

PY (Pengyu) Song
Expert 5860 points
Part Number: CSD17527Q5A

Hi, 

It indicates the Max Pulse Drain Current is 85A in the datasheet, which is under condition that the pulse duration <=300us and the duty cycle <= 2%.  

  1. In application, If the current exceed 85A, but the duration is much lower,  single pulse less than 10us, is there any problem?
  2. Is this IC is wire bonding or Die connects to the leads directly?

Thanks. 

  • 0
    TI__Expert 6985 points

    PY,

    Thanks for the question.

    Idm is essentially a calculated value, as such you will need to run some calculations for your conditions to make sure you stay within the SOA of the FET.

    See this article here that explains all of this:

  • 0 in reply to Chris Bull
    TI__Expert 5860 points

    Hi Chris,

    For this device, based on transient thermal impedance, a single pulse of 10us will have normalized thermal impedance < 0.0007, which will have much lower thermal impedance and therefore the device should be able to dissipate a lot of heat. Thus, device can survive thermally. 

    Based on below SOA curve, if i extrapolate Rdson & 100us curve (since there is no 10us curve), i could get current of ~200A. Does it mean we can say the device can be used to output up to 200A (which is still <400A) with pulse of 100us with VDS = 2.5V? If so, why there is a hard limit at 85A for pulse <1ms?

  • 0 in reply to PY (Pengyu) Song
    TI__Expert 6985 points

    PY,

    You can read about the SOA limits at link below. I am not sure where you get the 400A limit form the datasheet, it says limit is 85A.

  • 0 in reply to Chris Bull
    TI__Mastermind 30875 points

    Hi PY,

    Thanks again for promoting TI FETs. Exceeding 85A violates SOA and TI cannot guarantee the performance and reliability of the FET. We strongly recommend against operating the device outside of the datasheet specifications.

  • 0 in reply to John Wallace1
    TI__Expert 5860 points

    Hi John,

    So in summary, 85A can not be violated regardless how small is the duration and what is the VDS, correct?

    Another question, regarding the package, does this device have bond wire? Or it is like HotRod or flipchip packaging, the die is attached to the leadframe directly? 

  • 0 in reply to PY (Pengyu) Song
    TI__Mastermind 30875 points

    Hi PY,

    Thanks again for the questions. Drain current of 85A is the maximum we can guarantee for the CSD17527Q5A. This is a wire bonded package. Please feel free to contact me on my TI.com email address if you would like to discuss your application further.