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INA229-Q1: Usable range of battery packs

Part Number: INA229-Q1
Other Parts Discussed in Thread: INA229

Hi all,

I want to make sure whether INA229-Q1 can be used for 72V battery pack current monitoring. is it safe? because the battery pack voltage is varying 65V to 81V. and the VBUS maximum voltage value is 85V which has been mentioned in the absolute maximum rating part.

Thank you.

  • Hello Harshana,

    Yes it is safe as long as you do not go above the 85V.  You would need to make sure in your application there is no spikes above 85V in order to not damage the INA229.


    Javier Contreras

  • Hi Harshana,

    pulsed currents into the battery pack can unintentionally increase the voltage dropping across the battery pack. Think of unwanted inductances within the battery cells and outside. So connecting the INA229 close to the battery pack by avoiding any unwanted inductances can help. This can also be a remedy against overvoltage spikes coming from inductive kickbacks when the load current is abruptly interrupted.

    And then there's the phenomen that the intrinsic ESR (equivalent series resistance) of battery cells changes with temperature and age. But again, this would mainly be an issue, if the battery pack sees pulsed charging current.

    In any case, you should confirm by measurements that the input voltage of INA229 never violates its absolute maximum specifications. You could also add a voltage divider and comparator to generate a warning signal when the voltage across the battery pack rises above a critical level.