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BQ24296: BQ24296 parts spec-in recommendation

Leo Chow
Expert 3120 points
Part Number: BQ24296
Other Parts Discussed in Thread: BQ24073

Hi BMS team,

We're in midst of proposing a battery charging solution to our clients & for your reference below, the summary features of charger IC are as follows:

 

1. The battery voltage is 4.2V and charging current is about 500mA max.

2. Able to charge the 1130mAH li-on battery within 2 hours.

3. IC must have indicator for battery low, charging start.

4. Charger IC should have basic protection for safety purpose, for example : (if have extra protection is better)

  - Input OVP

  - Output OVP

  - short circuit protection

  - Thermal protection

 

 

I notice that BQ24296 may be a good fit but seems like a combo chip solution may be required to meet all the criteria above. Kindly advise on my proposal. Thanks.

 

Regards,

Leo

  • 0
    TI__Mastermind 25800 points

    Hey Leo,

    The bq24296 should fit your needs perfectly, but I have a couple more questions about your system.

    What is the input voltage range and current capability?

    Do you need the ability to detect input power based on the USB BC1.2 spec?

    Will you be connecting your downstream devices directly to the battery or have some isolation through a battery FET?

    Will you need your system to operate if you are charging but the battery is dead?

    Regards,

    Joel H

  • 0 in reply to Joel Hernandez II
    TI__Expert 3120 points
    Hi Joel,
    I've moved on to propose BQ24073 as my client only require a simple battery charger controller & BQ24296 would be an overkill. Assuming charging input of 5V,500mA to charge a 1130mAh Li-Ion battery. Do we have a formula to estimate the charging hours to complete charging?

    Also if i'm asking more details pertaining BQ24073, should I respond on this thread or start another thread? Thanks.

    Regards,
    Leo
  • 0 in reply to Leo Chow
    TI__Mastermind 25800 points
    Hey Leo,

    Yes, you may want to start a new thread with that part number so the engineers that support that part can help.

    From a charge time estimation, I believe it is something around Capacity / Charge Rate * 1.3. So here, I would venture ~3hr using the linear charger. Less time with more charging current obviously. Biggest bottleneck is the CV portion of charge. That is where there is an extra 30% of capacity that needs to be filled and it cannot be controlled.


    Regards,
    Joel H