• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 47 subscribers
  • Views 86 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

AMC3311: Thermal Dissipation and Maximum Current Consumption of AMC3311

Ynouss DIALLO
Prodigy 20 points
Part Number: AMC3311

Tool/software:

Hello,

I have a question regarding the thermal dissipation and current consumption of the AMC3311. According to the datasheet, the maximum current is specified as 41 mA with no external load on HLDO. However, the graphs in the documentation show a different reality, with a maximum current of 27.5 mA at 5V and 30 mA at 120°C.

Could you clarify in which specific use case the current consumption reaches 41 mA? Additionally, is the defined power dissipation the maximum that the package can handle?

We plan to use the AMC3311 for monitoring supercapacitor cells. The voltage divider resistors will have low values (as show on the simulation below), leading to already high consumption. With a large number of cells (between 20 and 50), the power consumption of the package could become significant, especially considering the approximate 235 mW dissipation. We would like to understand under which conditions the component reaches this specific worst-case current consumption and, consequently, the worst-case dissipation.

In my simulations using the provided model, the power consumption does not exceed 100 mW under normal conditions (20 mA). I’ve attached the simulation results for reference.

Thank you for your insights!

Best regards,

  • 0
    TI__Expert 8455 points

    Hi Ynouss,

    Thank you for your questions.

    41mA is specified as the maximum supply current while 28.5 is the typical. The maximum value in our datasheets is a tested value, you should not find a device with a value larger than the maximum for given parameter. It does not mean there is necessarily a condition we specify for when this may occur. The typical value is most likely what you will see and what the graphs are intending to show. The maximum is simply the upper limit of acceptable value for this parameter to have the device work as expected. This same explanation applies to the power dissipation parameter as well.

    As you have demonstrated, if the power consumption of your model does not exceed 100mW under normal conditions that is a good indicator. Are you able to calculate the worst-case power consumption if a device were to perform with the maximum supply current? Ensuring that could be a good way to verify and account for this. Please let me know if you have more questions.

    Best regards,

    Eva