BQ40Z50: Battery fuel gauge with Impedance Track needed for 3S LiPo system

Carl Olen

Part Number: BQ40Z50
Other Parts Discussed in Thread: BQ24773, MSP430F5529, BQ24773EVM-540, EV2400, , , BQ24770

I have a 19.5V 180W laptop supply feeding the input to my product. I've decided on a host-controlled NVDC Charge Controller: bq24773 (I am more familiar with I2C than SMBus). I have a 3S battery stack of LiPo 3.7V batteries, 7300mAh. I ordered the EV2400 interface board and BQ24773EVM-540 evaluation module. So, my host controller will be a MSP430F5529.

I want to add an Impedance Track fuel gauge to this system. I was looking at the bq40z50. But the datasheet says it's "Not Recommended for New Designs." What alternatives does TI offer that will work with my system that are recommended for new designs?

What other parts will I need to make this whole system work? Please let me know.

Thanks,

Carl Olen

over 6 years ago

0 Batt over 6 years ago

TI__Mastermind 42535 points

Please use the bq40z50-r2.

0 Carl Olen over 6 years ago in reply to Batt

Expert 1160 points

Batt, I think this might work. However, I think I will need to switch over to the SMBus version of my power path management chip (changing from the bq24773 to the bq24770) to have SMBus consistent throughout, right?

Is there a reference design for a system that uses the bq24770 and bq40z50-r2 together in one system? If so, please send the details.

Thanks,
Carl

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BQ40Z50: Battery fuel gauge with Impedance Track needed for 3S LiPo system