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BQ25720: BQ25720RSNR

Udesh Singla
Intellectual 500 points
Part Number: BQ25720


HI TI Team 

We have one doubt regarding the battery charger IC BQ25720RSNR. We are working on the laptop project. We are using 3 cell battery with the nominal voltage of 11.V and capacity of 3800mAh. We are using the below configuration.

Our battery is connected at VCC_BATT_IN. We are using the 19.5V/3.34 adapter. when the battery voltage is more than the 19.5V suppose 24V or 30V how this will protect the over voltage and what will happen across the ACP and ACN.

  • 0
    TI__Mastermind 34775 points

    Hi Udesh,

    I think you are asking about AC adapter over-voltage. 

    "The charger has fixed ACOV voltage threshold with hysteresis. When VBUS pin voltage is higher than VACOV_RISE for more than 100 μs, it is considered as adapter overvoltage. CHRG_OK pin will be pulled low by the charger, and the converter will be disabled. As system falls below battery voltage, BATFET will be turned on. When VBUS pin voltage falls below VACOV_FALL for more than 1 ms, it is considered as adapter voltage returns back to normal voltage. CHRG_OK pin is pulled high by external pull-up resistor. The converter resumes if enable conditions are valid."

    The ACOV level is 26V. ACP/ACN/VBUS abs max rating is 32V. Stresses beyond those listed under Absolute Maximum Rating may cause permanent damage to the device.

    Regards,

    Tiger