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BQ25730: Unable to limit Charge current

Rajendar Reddy Beeram
Prodigy 40 points
Part Number: BQ25730

Tool/software:

Dear sir,

In the BQ25730 IC Current limit set in charge current register is not reflecting during battery charge and it's charging with around 3 Amps. May we know what could be the reason for this sudden abnormal behaviour.

  • 0
    TI__Mastermind 32715 points

    Hi, Rajendar,

    Could you provide a little more information, such as input voltage, battery voltage, charge current?  Schematic and register dump?

    Regards,

    Tiger

  • 0 in reply to Tiger Zhou
    Prodigy 40 points

    Hello sir,

    we are operating charger in boost mode with input voltage 12V and boosting it to 17V. while the charge current is set as 512mAmps it's charging the battery at around 3 Amps (in only one PCB)(4cell 16.8V battery).

    when the same register configuration is used in other PCB charge current is controlling fine and charging the battery with current set in charge current register.

    for your info register config is also mentioned below:

    Charge option0: 0x070E

    Charge current:0x0200

    Charge voltage:0x4300

    otg voltage:0x00

    otg current:0x00

    Input voltage:0x1000

    System min voltage : 0x7B00

    Input current limit : 0x3200

    Chargeoption1: 0x3F00

    Chargeoption2: 0x3037

    Chargeoption3: 0x0434

    Prochot option 0: 0x4A81

    Prochot option 1: 0x41A0

    ADC option: 0xE0FF

    Charge option 4: 0x0048

    Vmin active protection: 0x006D

    For your reference schematic is attached.

  • 0 in reply to Rajendar Reddy Beeram
    TI__Mastermind 32715 points

    Hi, Rajendar,

    Since this only happens to one board, it could be a single incident. Could you do a ABA swap to see if this symptom follows the IC or follow the board?

    "The A-B-A Swap Method is a simple cross check test, which can confirm the observed issue is not systemic.

    • A-B-A Swap Method
      (1) Remove the suspected component (A) from the original failing board.
      (2) Replace the suspected component (A) with a known good component (B) and check if the original board now works properly.
      (3) Mount the suspected component (A) to a known good board and see if the same faliure occurs on the good board.

    Step 3 is important because it helps us to exclude any possibility that the issue is caused by a systemic issue or the interaction of multiple slightly bad components on a good board."

    Regards,

    Tiger