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INA226: Power Consumption

Aditya Kumar Singh
Prodigy 30 points
Part Number: INA226

Tool/software:

Hi E2E Team,

I am not able to find the power consumption from the INA226 datasheet. Can you please share the power consumption @5V (input voltage) considering below scenario-

- IC is measuring the voltage at IN+ and IN- pins continuously and communicating over I2C simultaneously

Regards

Aditya

  • 0
    TI__Expert 7010 points

    Hi Aditya,

    If you refer to the electrical characteristics page, you'll see the quiescent current spec'd.

    During device operation, the quiescent current (Iq) in nominally 330 uA, so with 5V at the power supply, the power consumed by the INA226 will be P = 330 uA * 5V.
    Please note that the Iq changes depending on I2C clock frequency. Please adjust calculations using the graph below.




    Best,

    Mallika Senthil

  • 0 in reply to Mallika Senthil
    Prodigy 30 points

    Hello,

    Thankyou for your response.

    Generally, Iq is the current consumed by the IC internal ckt. when IC is in standby mode or sleep mode and Active current is when IC is out of reset and in active mode.

    Into the datasheet of INA226, only Iq is mentioned everywhere hence got confused.

    So, as per your response the Iq is the total current consumed by INA226 during active mode (IC is measuring the voltage at IN+/IN- pins and also communicating over I2C interface) correct?

    Regards

    Aditya

  • +1 in reply to Aditya Kumar Singh
    TI__Expert 7010 points

    Hi Aditya,

    Yes Iq = (330 ~ 420) uA is the nominal current consumed by the IC in active mode, overheads like bias current from the input side may add a little to the total current consumption, but it shouldn't be as significant as the Iq.

    Best,
    Mallika Senthil

  • 0 in reply to Mallika Senthil
    TI__Expert 7010 points

    Hi Aditya,

    You may also want to consider the current going into the VBUS pin if you have that pin connected. The spec to use for that calculation is the VBUS input impedance. 

    Best,
    Mallika Senthil

  • 0 in reply to Mallika Senthil
    Prodigy 30 points

    Hi Mallika,

    Thankyou for your response.

    As per datasheet VBUS input impedance is 830k. Hence if VBUS ~ 12V then, 14.5uA current will be drawn by VBUS pins or we need to consider any other current for VBUS pins? I am not able to find the i/p current for VBUS pin into the datasheet.

    Regards

    Aditya

  • +1 in reply to Aditya Kumar Singh
    TI__Expert 7010 points

    Hi Aditya,

    Yes that's correct, ~ 14.5uA will be current going into the VBUS pin.

    Best,
    Mallika Senthil