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TPS659037: PMIC power consumption

Michi Yama
Guru 10030 points
Part Number: TPS659037
Other Parts Discussed in Thread: AM5728

Hi,

I have some questions regarding TPS659037 PMIC

My customer measured the power consumption of 659037PMIC with AM5728.

The combination is the below.

・ AM5728AABCXA(Rev1.1）＋TPS659037A383( for Rev1.1)

・ AM5728BABCXA(Rev2.0) ＋TPS659037A394( for Rev2.0)​

Ver.2.0

condition

       crrent

    (mA)

temp.(℃)

     MPU

      GPU

    CORE

  IVA

When booting

1009

34.87

34.06

34.46

35.27

2D motion picture

1058

5949.44

49.84

48.63

49.84

 

Ver.1.1

condition

  current

   (mA)

temp.(℃)

MPU

GPU

CORE

IVA

2D motion picture

952

51.06

50.65

51.46

49.84

My question is below.

1) How do you think regarding this result? Is this result correct?  I think this result is correct. Because, as you know, the booting voltage of AM5728 rev2.0 is higher than AM5728 Rev1.1 device. So PMIC default voltage is changed.

2) My customer would like to measure the maximum power consumption of 3.3V input voltage of PMIC. How does he measure it?  If customer would like to know the power onsumption of 3.3V input voltage of PMIC, the below voltage setting should be used?

VD_CORE =VD_MPU = 1.2V

VD_RTC=Other =1.16V

I appreciate your quick reply.

Best regards,

Michi

  • 0
    TI__Expert 5650 points
    Hi Michi,

    Your question has assigned to expert responsible for this product.

    Best regards,
    Jari Niemelä
  • 0
    TI__Guru* 78475 points

    Michi-san

    I moved this to the Sitara forum, because it appears to me that these questions are more on processor power consumption? Feel free to correct me if that is not the case.

    On Q1 , can you clarify what results you want us to confirm.

    I see a current difference , but i also see what looks like temperature column reporting 5949.44?

    Is the software used for 2D motion picture the same?

    On Q2 , please clarify what you meant by "maximum power consumption of 3.3V input voltage of PMIC. How does he measure it?"

    Are you looking to estimate max 3.3V power consumption for SOC? If so, why is this needed - as irrespective of the consumption the PMIC solution is fixed and the assumption is that whatever is the power consumption - is comprehended by the companion PMIC solution.

    If you are looking to do further power estimates, you can look at AM57x power estimation tools and also look at typical power consumption data that we publish for various processor sdk benchmarks

  • 0 in reply to Mukul Bhatnagar
    Guru 10030 points

    Dear Mukul-san,

    Thank you for your reply.

    Regarding your question, please see the below.

    > I see a current difference , but i also see what looks like temperature column reporting 5949.44?

    --- Yes,  you are right. It is my fault. "5949.44" is wrong. Correct value is "49.44" degC.

    > Is the software used for 2D motion picture the same?

    --- Yes.

    > On Q2 , please clarify what you meant by "maximum power consumption of 3.3V input voltage of PMIC. How does he measure it?"

    --- Please see the below figure. This is my customer's connection.

    As you see from the above figure, 3.3V and 5V for PMIC is supplied from other board.  So customer would like to know the maximum current that is consumed by PMIC.

    But we don't know how 3.3V power source is consumed internal PMIC circuit. So customer would like to know the PMIC's worst case that 3.3V source is consumed.

    I appreciate your quick reply.

    Best regards,

    Michi 

     

  • 0 in reply to Michi Yama
    TI__Guru* 78475 points
    Hi Michi-san
    on Q1 , the variation you are seeing seems reasonable to me, this could be due to device to device variation based on silicon process variation.
    It is recommended that you look at the AM572x PET for worst case power consumption over temperature (and perhaps add some additional guardband to what you get from PET) - it is not recommended to base that on measurement from a few bench units over nominal conditions alone.
    On Q2 I will ask the PMIC team to chime in.
  • 0 in reply to Mukul Bhatnagar
    TI__Genius 16030 points
    Hello Yama-san,

    There are two sources of internal power consumed by the PMIC. The first is the quiescent current of the PMIC. This is specified in the datasheet per rail, meaning each SMPS and LDO has a quiescent current spec. You can add these up for all rails that are used in your system.

    The second part is efficiency loss of the SMPS and LDOs. To calculate this, you will need to know the load current, input voltage, and output voltage of the regulators. Then you can use the efficiency to calculate power loss. We have an Excel tool that will make this easier.
    e2e.ti.com/.../3366.power-estimator-tool

    Regards,
    Karl