BQ27441-G1: Battery charger application design

Kazutoshi Sako

Part Number: BQ27441-G1
Other Parts Discussed in Thread: BQ24072T,

Tool/software:

I am developing a battery charger application using lithium-ion batteries.

In past designs, I used the BQ24072T.

For new board designs, I am considering adding a fuel gauge IC to more accurately determine the remaining battery charge.

I am considering using the BQ27441-G1 as the fuel gauge IC.

In this case, the battery has only one thermistor, so it is not possible to measure the temperature with both the charger IC and the fuel gauge.

Is it possible to configure a circuit that avoids this?

Also, could you recommend an IC that combines a battery charger IC and a fuel gauge?

2 months ago

0 Adrian 2 months ago

TI__Mastermind 37761 points

Hello,

No, you will need to add another thermistor to the design. One thermistor can be not be shared between the charger and the gauge. We do not have an IC that combines a charger and gauge.

Regards,

Adrian

0 Kazutoshi Sako 2 months ago in reply to Adrian

Prodigy 10 points

Thank you for your reply.
The BIN terminal of the BQ27441-G1 is a logic input that checks whether the battery is connected or not,
and I understand that the thermistor is not used as a temperature sensor. Is that correct?

0 Adrian 2 months ago in reply to Kazutoshi Sako

TI__Mastermind 37761 points

Hello,

The thermistor is used as a temperature sensor, and this is important for proper gauging for our algorithm.

Regards,

Adrian

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BQ27441-G1: Battery charger application design