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TPS61041-Q1: Design for dark current and cosumption current

Keisuke Wakazono
Prodigy 10 points
Part Number: TPS61041-Q1

Hello TI-teams,

I designs dark current and comsumption current for TPS61041-Q1,but we do not have enough information for calculation from datasheet .

So, Could I ask any questions for quiscent current?

Question 1.

I understand that the above Iq(Operating quiescent current) does not contain  the charge current to Ciss of swittching FET and ONLY Logic consumtion current in ICs ,is that right?

If my understand is correct, I would like to know the charge current to Ciss of swittching FET at a swittching frequency and the error for dark current and consumption current designs.

Question 2.

Relating to Question1,  I would like to Iq at room temperature including the error for designing of dark current. 

 

Best regards,

  • 0
    TI__Mastermind 18970 points

    Hi Keisuke,

    About question 1: you are correct, the Iq refers to the logic consumption current in IC when there is no switching(so no charge current to Ciss).

    About question 2: typical Iq at room temperature is 28uA, as shown in the datasheet. The max Iq at whole temperature range is 50uA. Could you use this data for the error estimation?  

    Sorry I'm not familiar with the "dark current and consumption current", could you comment more detailed what do they refer? Or just provide a simple schematic concept to show how the charge current to Ciss impacts the accuracy? 

    Regards

    Lei

  • 0 in reply to Lei Zhong
    Prodigy 10 points

    Hi Lei,

    Thank you for replying.

    I will use TPS61041-Q1 for automotive application.

    When vehicle is parking, TPS61041-Q1 should be keep working with very low output current.

    On the other hand, we should reduce dark current in parking, so that I need to estimate IC consumption in detail

    and I think that the charge current to Ciss impact is big relative to the target value of dark current.

    Therefore, I would like to estimate both the charge current to Ciss and Iq (logic consumption current) including errors at room temperature. 

    Best Regards

    Keisuke

  • 0 in reply to Keisuke Wakazono
    TI__Mastermind 18970 points

    Hi Keisuke,

    Thank you for your detailed information.

    I'll further check and get feedback to you tomorrow.

    Regards

    Lei

  • +1 in reply to Lei Zhong
    TI__Mastermind 18970 points

    Hi Keisuke,

    Here are some supplements for your reference:

    I checked one lot data of around 500k units, the typical Iq(no switching) at room temperature is 28uA +/- 5uA.

    When the device is switching, the condition is more complicated. Except the charge current, there are function block consuming current and load current, all comes from the total input current. So I think it may be better to estimate the total input current based on the work conditions(Vin, Vout, Iout, efficiency) when the device has switching.

    Regards

    Lei