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INA180-Q1: Iq issues

Daniel Wang (auto)
Expert 3860 points
Part Number: INA180-Q1
Other Parts Discussed in Thread: INA180, INA138, INA168

Tool/software:

Hello team,

My customer found Iq linearly increased along with higher voltage, when bus voltage increases by 1V, the current consumption increases by 10uA.
Bus voltage: 9-16V

Pls support below questions:

1. What is the input resistance from IN+ to GND?

Customer is using A1 version, Rint=25k, internal series resistor should be 500k, but it is not compliant with the phenomenon.

2. There is no Iq under Vsense=0, pls specify it.

3. The Iq under Vsense=10 mV is about 197uA, which is so large, the system quiescent current need to be within 300uA, why such high Iq needed for the INA180?

Thanks!

Regards,

Daniel Wang

  • 0
    TI__Expert 8555 points

    Hello Daniel,

    1.

    The input resistance from IN+ to GND is over 500kΩ (nominally it will be at least 525kΩ) as is stated in the datasheet. There will be an equivalent resistance on the IN- pin to GND during shutdown.

    This plot shows the expected input bias current from the combined current of both inputs during shutdown.

    This plot shows the input bias current while the part is not in shutdown.

    2.

    The test conditions state that the IQ will be ≤ 300µA when Vsense = 10mV, but this spec also applies when Vsense = 0V.

    the input bias current will be about 80µA when Vsense = 0V.

    3.

    The INA180 is a cost-optimized part. The INA168/INA138 has a lower IQ, at 60µA, and can be used instead of the INA180 as it is P2P. Feel free to browse our whole portfolio of current-shunt amplifiers at https://www.ti.com/amplifier-circuit/current-sense/analog-output/products.html.

    Let me know if you have any more questions,

    Levi DV