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BQ29330: [ELENTEC] BQ29330 problem inquiry

MJ Jeon
Genius 5240 points
Part Number: BQ29330
Other Parts Discussed in Thread: BQ20Z90, , BQ40Z50

Hi, TI support team

I are sorry to hear that there is a defect from the customer.

The applied parts were designed by combining BQ20Z90 and BQ29330.

Please refer to the Block Diagram below.

[Defect content]

The BAT PACK output voltage does not come out, and the D-FET side is turned off after checking the FET Turn state.

On the BQ studio, the Turn On/Off status of the FET is accurately displayed,

The correct voltage is not being measured on the actual DSG pin.

CHG is measuring 20V, but DGS is measuring 15V.

→ Cell voltage: 15V

Questions

1) What is the charge pump voltage for FET Turn On/Off?

2) There is no charge pump circuit, where does the pump work?

The D-FET side is blocked because the DSG PIn voltage is pumped and there is no output.

Please check if the IC is the problem or if it is another problem.

Thanks.

Regards,

MJ

  • 0
    TI__Mastermind 36500 points

    Hello MJ,

    Any reason why you are using the BQ29330 with the BQ20Z90, these are both very old devices. You could use devices like the BQ40Z50 which provide both gauging and protection features in the same package. If you want more recommendations you could open a new thread to ask the GAUGE team.

    1) What is the charge pump voltage for FET Turn On/Off?
    This is in the datasheet. Typically a gate-source voltage of ~12-V for both CHG and DSG when the FETs are ON, and a ~0.2-V at the gate-source when both FETs are OFF. See image below:

    2) There is no charge pump circuit, where does the pump work?
    The charge-pump is integrated in the IC in the N-Channel FET drive.

    Could you share your schematic so we can review to make sure everything is okay?

    Best Regards,

    Luis Hernandez Salomon