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BQ25731: Battery charge controller IC

Sai Ravali
Prodigy 70 points
Part Number: BQ25731

Tool/software:

We are using BQ25731RSNR battery charge control IC from TI to charge 12V, 7A Lead acid battery. We need support on the following:
  1. Does BQ25731RSNR support the Lead acid battery. Please find the below image for your reference.
  2. If the above battery is compatible with the IC, then please give us the register values. Please check the register values in the excel file attached.
  3. As of now, we are not able to charge the above specified battery properly and not knowing the battery connection status.

BQ25731_with_battery.xlsx

  • 0
    TI__Mastermind 32745 points

    Hi, Sai,

    BQ25731 is a multi-chemistry battery charger. You can simply set max charge voltage and charge current, then enable charging. It will charge the lead acid battery to the max charge voltage, and automatically transitions to the constant voltage charging.

    You might need to terminate the charging operation when your target voltage is reached, by sending a command from a host or a MCU.

    BQ25731 is a digital part, which relies on the host for communication.

    You can start with default register values and make minimal changes. See below. 

    Fullscreen e2e-leadacid.txt Download 
    * Created: Wed Jan 29 15:52:28 CST 2025
*
* Format: Register Name  tab Character,\t  Hexadecimal register value.
* Device: bq2573x
* BQZ Container: Charger_1_00-bq2573x.bqz
*
Charge Option 0	070A
Charge Current	0400
Max Charge Voltage	3138
OTG Voltage	09C4
OTG Current	3C00
Input Voltage	0000
Min System Voltage	4200
IIN_HOST	2000
Charger Status	8400
Prochot Status	B800
IIN_DPM	2000
ADC VBUS and PSYS	CE00
ADC IBAT	0000
ADC IIN and CMPIN	0000
ADC VSYS and VBAT	0000
Manufacture ID	D640
Device ID	00D6
Charge Option 1	3300
Charge Option 2	00B7
Charge Option 3	0434
Prochot Option 0	4A81
Prochot Option 1	41A0
ADC Option	2000
Charge Option 4	0048
Vmin Active Protection	006C

    Regards,

    Tiger

  • 0 in reply to Tiger Zhou
    Prodigy 70 points

    Hi Zhou,

    Thanks for the response. we are checking it.