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BQ34Z100-G1: Sense resistor for high current

ANIL AGGARWAL
Prodigy 153 points
Part Number: BQ34Z100-G1

Can I use the WSBS8518L0500JK resistor as a sense resistor in my Battery gauging design?

It is a 50 micro Ohm resistor. I am looking at a 200 Amp peak and 100 Amp nominal discharge from my battery pack.

  • 0
    TI__Mastermind 19195 points

    Hi Anil,

    A sense resistor this low will likely cause linearity issues. 5 mOhm to 20 mOhm is the typical range for the sense resistors with this device. The device is able to support larger currents and smaller sense resistors, such as a 2 mOhm sense resistor, but as a tradeoff at low currents, may require modification of some parameters, such as CC deadband and offset to prevent 'ghost currents' from being read. 

    As this application will be in excess of 32 A, please also refer to this app note: www.ti.com/.../slua760