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TIDA-00792: Boot by Charger Voltage

KIM
Intellectual 550 points
Part Number: TIDA-00792

Hi,

Based on the TIDA-00792, there is a circuit to boot the BQ769x0 by charger voltage as the attached figure.

For our removable battery pack design, if the battery pack is not connected to charger, charger output voltage is 3.5V. Once the battery pack is connected to charger, charger will detect battery pack via SMB and turn the charger output to full voltage 30V.

The proposed circuit on TIDA-00792 need charger voltage higher than battery voltage to boot the BQ769x0. What is the modification we need to do on this boot circuit if the charger voltage is less than battery voltage (e.g. 3.5V)?

Thanks,

Kim

  • 0
    TI__Guru* 77283 points

    Hi Kim,

    This circuit from TIDA-00792 is looking for a rapid rise on PACK+ to boot the IC. A 3.5 V output from the charger may not be enough to wake this circuit (need to consider coupling, Vgsth of the FET, etc.). We haven't seen a specific use case like this before, so unfortunately I do not have an easy solution to point you to.

    Regards,

    Matt