BQ76942: Companion Fuel Gauge that supports <1mΩ current shunt for high current application

Alex Klimaj

Part Number: BQ76942
Other Parts Discussed in Thread: BQ76940, BQ34Z100-G1

Hello, I have an application that requires protection and fuel gauging for a system that averages 50A from a 6S Lipo with 5-10 second 100-150A bursts. It looks like the BQ76942 supports a shunt less than 1mΩ but I cannot find a fuel gauge that can share this small value shunt. Does TI have anything that could work?

over 4 years ago

0 David Hien over 4 years ago

TI__Genius 10830 points

Hi Alex,
You can look at BQ34z100-G1 or BQ34110, our 2 "top of stack" gauges, to work with BQ76942 and a small shunt resistor.
Here is a reference design with BQ34z100-G1 and BQ76940, another of our monitors, for instance.
Here is another E2E post about small shunt resistors and BQ34z100-G1.

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BQ76942: Companion Fuel Gauge that supports <1mΩ current shunt for high current application