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INA226: About Input bias current

Ozawa
Intellectual 850 points

Part Number: INA226

I have a question,

Electrical characteristics of data sheet p.5 "Input bias current"
This is 10uA (Ta = 25 ℃ / Vin + = Vin- = 12V) at TYP.

However, Figure 12 on page 8 of the data sheet is different.
Vin + = Vin- = 12 V, Ib = 19 uA.

Also see Figure 13 on page 9.
25 ° C, Ib = 19 uA.

What should I think about this?

Besr regards,

Ozawa

  • 0
    TI__Mastermind 32395 points

    Hello Ozawa,

    Let me look into this. I will respond back shortly.

    Sincerely,
    Peter Iliya
    Current Sensing Applications

  • 0 in reply to Peter Iliya
    TI__Mastermind 32395 points
    Hello Ozawa,

    After looking through the data and talking with the team, the values you see for Figure 12 and Figure 13 in INA226 datasheet are actually the sum of IB+ and IB-, while the 10uA in the Electrical Characteristics Table is specifying the input current value for the IN- and IN+ pin individually.

    For all these cases, common-mode is 12V and Vsense = 0. For the 10uA spec, we try to specify the specifications for the "IN-, IN+ pins". Since IB+ and IB- are very close in value when Vsense =0V, they can be added together for Figures 12 and 13. It goes without saying, but please note that the 10uA spec is a typical value based upon many measurements, while the Figures 12 and 13 are actual measurements of just one unit, so (IB+) + (IB-) at 12V common-mode is not exactly 20uA.

    Peter Iliya
    Current Sense Applications