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BQ24090: PMIC Charger Recommendation for 2-cell Li-ion Battery (LIR2450) and Reference Design

Abdurrahman Zaim
Prodigy 60 points
Part Number: BQ24090

Hello E2E Community,

I am currently working on a project that involves the use of 2 LIR2450 Li-ion batteries. For the battery charging aspect, I am seeking recommendations for a suitable Power Management Integrated Circuit (PMIC) charger from Texas Instruments.

Specifically, I would appreciate your guidance on the following:

  1. PMIC Charger Recommendation:

    • Could you please recommend a PMIC charger that is suitable for charging 2 Li-ion cells in parallel, specifically LIR2450 batteries? I am looking for a device that provides efficient and safe charging for this configuration.

  2. Configuration Details:

    • What configurations and settings are recommended for the chosen PMIC charger to ensure optimal charging performance for LIR2450 batteries? This includes voltage, current, termination criteria, and any other relevant parameters.

  3. Reference Design:

    • If available, I would greatly appreciate it if you could share any reference designs or application notes related to a PMIC charger for a 2-cell Li-ion battery configuration similar to what I described. This would be immensely helpful in guiding my design process.

Thank you in advance for your time and assistance. I look forward to hearing from the community's expertise on this matter.

Best regards,
Zaim

  • 0
    TI__Prodigy 500 points

    Hi Zaim,

    Can you share more details below?

    • Application:
    • Input voltage:
    • Desired charging current: 

    For integrated devices (charger + additional rails), we have a couple options to consider depending on your design. In the technical documentation section, you can find available application notes. 

    • BQ25120A: Battery management unit device with integrated charger, LDO, and buck converter
    • BQ25155: Battery management unit device with integrated charger and LDO

    Best regards,

    Chloe 

  • 0 in reply to Chloe (BCP) Wang
    Prodigy 60 points

    Hello Chloe,

    Thank you for your prompt response and for offering your assistance with my project.

    To provide further details, my application involves a prototype medical device utilizing two LIR2450 3.6V batteries connected in parallel. Each battery has a capacity of 120mAh, and parallel connection is intended to maintain the same voltage while doubling the available current, which is crucial for powering my portable device.

    Regarding the battery protection circuitry, I aim to ensure comprehensive protection while maintaining efficiency and reliability, considering the specifications outlined in the datasheet of the LIR2450 batteries I plan to use (datasheet link). Could you please recommend a suitable protection circuit that I can integrate into my design to address overcharging, over-discharging, and overcurrent concerns?

    Additionally, I'm interested in configuring the protection circuit for the scenario where two LIR2450 batteries are connected in parallel to achieve a total capacity of 240mAh at 3.6V. Guidance on optimizing the performance and safety of this setup, taking into account the specific characteristics of the batteries outlined in the datasheet, would be greatly appreciated.

    Furthermore, I would be grateful for any reference designs or application notes related to battery protection circuits, especially those designed for Li-ion batteries used in parallel configurations. Such resources would be invaluable in guiding my design process and ensuring compliance with best practices.

    Thank you once again for your time and assistance. I look forward to your recommendations and any additional insights you can provide.

    Best regards,

    Zaim

  • 0 in reply to Abdurrahman Zaim
    TI__Mastermind 42060 points

    Hello Abdurrahman,

    The best protectors for a single cell in series (1s), would be the bq298x protector. This protector has high-side FET drivers to protect the battery, and it offers over-voltage, under-voltage, and current protections. I'd recommend to read the datasheet to see if there's a released device that meets your needs. An alternative would be to use the BQ297x, which uses low-side FETs instead.

    Since you are using two cells in parallel (1s2p), you only require a single protector IC. Typically having the cells in parallel is no problem, and the cells are balanced with respect to each other as they are in parallel. So you won't really see any application note for parallel cells, as these often do not require too much additional consideration.

    Also, if you require gauging, then we also have gas gauges with our proprietary gauging algorithm, which is the Impedance Track algorithm. I'd recommend to open a new thread to ask for gauging recommendations if needed.

    Best Regards,

    Luis Hernandez Salomon