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BQ25180: Battery protection

Ulf Nilsson
Prodigy 20 points
Part Number: BQ25180
Other Parts Discussed in Thread: BQ24072

Tool/software:

Can I use the the BQ25180 as a battery charger combined as a battery protection circuit for Li-ion battery cells, or are you recomending mi not to do it?

I am planning to certify our product for IEC 62368.

  • 0
    TI__Genius 9990 points

    Hello Ulf,

    The BQ25180 is a Li-Ion battery charger and includes several built-in protections, such as battery undervoltage protection (BUVLO), battery short protection (BATSC), battery overcurrent protection (BATOCP), battery thermal fault protection (TS) and more.

    If you're asking whether it can fully replace a dedicated battery protection IC, that depends on your system's specific requirements.

    Regarding IEC 62368 certification, the BQ25180 should not pose any issues for compliance. If you have any specific concerns about certification, let me know, and I'd be happy to discuss further.

    Best regards,

    Alec

  • 0 in reply to Alec Lehman
    Prodigy 20 points

    Thank you for your respons.

    The main issue is that in IEC 62368 they mention that you have to handle single fault. The testhouse are supposed to short mosfets, fuses and other current limiting components, one at a time. The issue is if, they think they should short the IC directly beacuse they can't short the internal Mosfets.

    Is there any testreports, other documents or some way to short the internal mosfets?

  • 0 in reply to Ulf Nilsson
    TI__Genius 9990 points

    Hello Ulf,

    I recommend looking at section 8.2 of the BQ25180 datasheet for a functional block diagram of the device.

    The BQ25180 includes battery short and system short protection features, which should allow it to pass IEC 62368-1 tests.

    We have several devices that have been IEC 62368-1 certified, including the BQ24072, which is a linear charger similar to the BQ25180. While the BQ25180 has not yet gone through the certification process, it is designed to meet the necessary requirements for compliance.

    Let me know if you have any specific concerns about the BQ25180 and certification.

    Best regards,

    Alec

  • 0 in reply to Alec Lehman
    TI__Genius 9990 points

    Depending on the specific IEC 62368-1 requirements you are testing against, you may need to include a battery protection IC, fuse, or other system-level components to handle certain fault conditions. Some tests may involve different types of shorts beyond what the BQ25180's built-in protections cover, so I would recommend considering additional protection components if needed.

    Again, let me know if you have any specific concerns and I'd be happy to discuss further.

    Best regards,

    Alec