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TPS62810-Q1: Max output current limitation

Caglar Cihan
Expert 6235 points
Part Number: TPS62810-Q1

Dear Team,

I need to build a design for following specifications:

Vin: 5V

Vout: 3.8V

Imax:4A

Tambient, max: 85C

This is an automotive appilcation and I picked TPS62180-Q1 for this application. Although the part is 4A rated (and Ilim, min is 4.8A), Webench simulation allows this design only up to 3.4A at 85C ambient. 

Is this a bug on Webench model, or is there really a limitation on the output current?

Best Regards,

Caglar

  • 0
    TI__Expert 8420 points

    Hi Caglar,

    the switch current limit of 4.8A is specified at maximum 150°C Junction temperature.

    While operating the device at 85°C Ambient temperature, the junction temperature is exceeding 150°C according to Webench modelling, and therefore not allowing to model for this condition.

    In my opinion it is not a bug on Webench, however I will double check whether this is the case on a real application and will let you know.

    As this is currently holiday period, please allow some time to provide the information. We will get back to you on the first week of January. or latest on the week of the 7th Jan

    Regards,

    Sabrina

  • 0 in reply to Sabrina
    TI__Expert 5425 points

    Hi Caglar,

    Webench uses assumptions on the thermal performance of the design implementation. The limitation of the output current you discovered is related to those assumptions. If you change the ambient temperature you can see the effect. 

    TPS62810 can handle 4A output current at 85°C ambient temperature, but it requires a more advanced thermal design of the PCB compared to the simple design shown as a suggestion in Webench. The EVM for the TPS62810 would be an example for such an improved PCB design. 

    Best regards,

    Juergen