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INA190-Q1: Position of the INA190 for current sense monitor in battery stack

FANJAS Guillaume
Prodigy 20 points
Part Number: INA190-Q1

I planned to use an INA190-Q1 to measure the current in a battery stack composed with 8 cells of lithium batteries.

I know that this component is capable to be used in high side or low side position. 

But in my case, it is easier to place the shunt resistor between cell 1 & 2 (so not the directly the - of the stack) or between cell 7 and 8 (andnot the directly the + of the stack).

Is it possible ?

  • 0
    TI__Mastermind 27715 points

    Hello, FANJAS, and welcome to the E2E forum!

    Thank you for your interest in the INA190-Q1. I don't see any problem with placing the shunt resistor between your lithium cells. Is your typical voltage per cell the nominal 3.6V, or some other value?

    The valid input common-mode voltage range (Vcm) of INA190-Q1 is from -0.3V to +42V. With 3.6V/cell, the shunt between cell 1 and 2 would see Vcm = 3.6V, and the shunt between cell 7 and 8 would see Vcm = 25.2V. These are all well within the range that INA190-Q1 can support.

    Best regards,

    Ian Williams
    Applications Manager
    Current Sensing