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BQ27220: Inquiry on Battery capacity and accuracy of BQ27220 & BQ27427

Grady Lee
Genius 4175 points
Part Number: BQ27220
Other Parts Discussed in Thread: BQ27427,

Tool/software:

Hi, TI expert

A customer has an inquiry about the battery capacity and accuracy of BQ27220 & BQ27427.

While reviewing BQ27220, I confirmed that the battery capacity is 100mAh as shown in the picture below, and I could not set the value to less than 100mAh when applying the filter.

Q1) The customer wants to use a 50mAh capacity battery. Can we use BQ27220? Is there any problem?

Q2) BQ27427 is also marked as Battery capacity(min)=100mAh, but can I use a battery capacity of 50mAh?

[BQ27220]

[BQ27427]

Unlike BQ27220, BQ27427 does not require compensation and has a built-in current sense resistor, so it seems better to apply. However, if there is no significant difference in accuracy due to the unit price difference, I would like to apply BQ27220.

Q3) Can you tell me how much of a difference in accuracy there is between BQ27220 and BQ27427?

Please check. Thank you.

  • 0
    TI__Mastermind 25565 points

    Hello Grady,

    This question has been assigned and will be followed up when possible.

    Thank you,
    Alan

  • +1 in reply to Alan Frias
    TI__Intellectual 1010 points

    Hello Grady,

    Both the BQ27220 and BQ27427 require a minimum of 100 mAh, so a 50mAh battery would not work for these gauges.

    BQ27220 use CEDV, while BQ27427 uses a much more advanced gauge algorithm called Impedance Tracking. Impedance tracking offers much better accuracy compared to CEDV as it can properly estimate internal resistance of a battery as it ages. BQ27427 will be much more accurate compared to the BQ27220.

    Thanks,

    Adam