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BQ24232H: BQ24232H

Joel Invers
Prodigy 70 points
Part Number: BQ24232H
Other Parts Discussed in Thread: BQ24232, BQ25188

Tool/software:

Hello,

For a small portable device I need to select a charger that could charge a 300mAH LiPol battery from a USB connector.

I need that the charger controller could have a Dynamic Power Path with a SYS output separated from the battery pin. Someone suggested me to use the bq24232 and it fufills all these specs.

However, and without Vin connected, I need that the chip disconnects the battery when it is on a shelf for a long time and its voltage drops below a voltage value (UVLO), and in a way that could consume microamps or less. This would be a protection for overdischarge of the battery. I have seen a UVLO in the pdf of the bq24232 but it refers to the Vin voltage and not to the battery voltage. I have not been able to see that the bq24232 isolates the battery when its voltage drops below a voltage. 

Please, could you confirm me that the bq24232 has not this mode for protecting over discharge? What does the chip when supplyting the LiPOl battery voltage to the SYS output this voltage drops below 2.8V or  2.6( (for example)?

Thank you very much in advance.

Regards,

Joel

  • +1
    TI__Genius 9295 points

    Hello Joel,

    I recommend checking out the BQ25188. It has power path, battery undervoltage lockout (BUVLO), and ultra low quiescent current modes: ship mode and shutdown mode.

    BUVLO disconnects BAT from SYS when the battery voltage drops below the programmed BUVLO setting. Ship mode and shutdown mode can be used to minimize the device's quiescent current, which is useful when the product is on the shelf.

    The BQ24232 does not have battery undervoltage protection. You would need an external battery protector IC or circuit to prevent over-discharge. Otherwise, the battery will continue powering SYS even if VBAT drops below VLOWV, which is 3.0V (typical).

    Best regards,

    Alec