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BQ76PL455A-Q1: Most recommended BMS IC

Lukasz Przenioslo
Expert 2630 points
Part Number: BQ76PL455A-Q1
Other Parts Discussed in Thread: BQ79616-Q1, BQ79616

Hello there,

I am looking for an optimum BMS IC allowing to achieve the following functionalities:

  1. Dedicated for multiple Lithium cells (8 or 16),
  2. Allows for voltage measurement of each cell,
  3. Allows for temperature measurement of each cell of physically adjacent cells,
  4. Allows for cell balancing,
  5. Allows for cell faults recognition,
  6. Allows multiple BMS IC's to be interfaced from within the same master device (in series or parallel, galvanically isolated connection),

The IC I have found that seems to fulfill these requirements is BQ76PL455A-Q1. What makes me uncertain about it is:

  1. Its a bit old already,
  2. It does not allow for incorporating automatic cell balancing procedures (the master controller has to poll for voltages and manually turn balancing ON/ OFF). So the IC does not have a lot of logic implemented in it.

Are there any more suitable (newer, cheaper) IC's available from TI for this kind of application?

I would appreciate all feedback!

  • 0
    TI__Genius 17370 points

    Hi Lukasz,

    I think the device that fits your needs is the bq79616-Q1 which has recently released, you can search the product folder to read an overview, but basically it is a newer improved 455 like device. The only current downside is some reference material is still behind NDA and we are somewhat limited in supply in the short term. However, if your project does not yet plan to ramp in short term, this may be the ideal choice. Alternatively, you can check out bq79606a which supports 6 channels per device but it is newer and has some improved feature set.

    Regards,

    Taylor

  • 0 in reply to Taylor Vogt
    Expert 2630 points

    Hi Taylor, thank you for your reply.

    The only current downside is some reference material is still behind NDA and we are somewhat limited in supply in the short term

    1. Is the bq79616-Q1 more of a prototype now? I cannot seem to find the complete datasheet for it.
    2. Is the bq79616-Q1 pin compatible with the BQ76PL455A-Q1?
    3. What we are missing in the BQ76PL455A-Q1 is the autonomous cell balancing algorithms implemented in the IC- Does the bq79616-Q1 consist of that?
    4. We would like to start the prototypes development asap- is it possible to start with BQ76PL455A-Q1 and then drop-replace with bq79616-Q1 (related to point 2)?
    5. Is the bq79616-Q1 cheaper or more expensive than BQ76PL455A-Q1?

    I would appreciate your further feedback.

  • 0 in reply to Lukasz Przenioslo
    TI__Genius 17370 points

    Hi Lukasz,

    It is not a prototype, its just that the full datasheet is still behind NDA, but it can be requested if you click the blue button on the product folder for bq79616. It is not pin compatible but is similar. The bq79616 and bq79606 allow internal logic routines for even/odd/duty cycle transitions etc. with control of timing etc. So I don't think it makes sense to swap to 616 if you start with 455 if you cannot wait a few months to start prototyping. I cant comment on pricing here, but you can make an official inquiry. Perhaps look into 606a as well that is fully released otherwise I suggest moving forward with 455 if the project needs to be rushed and you need full 16 channels.

    Regards,

    Taylor

  • 0 in reply to Taylor Vogt
    Expert 2630 points

    Thank you for the follow up Taylor.

    So the feature we lack the most in 455 is the lack of autonomous cell balancing- we will need to implement it by hand then. Arevthere any docs available explaining the topic in depth, so we could mimix the logic from the 616 in the .aster MCU?

    Ps: I cant seem to find that request button for the bq79616- could you please post a screenshot?

  • +1 in reply to Lukasz Przenioslo
    TI__Genius 17370 points

    Lukasz,

    Here is how to find the request button: Sorry I dont think we have any document explaining this but it should be straightforward depending on your needs and timing to enable the FETs when you desire in a loop of some kind.

     

    Regards,

    Taylor