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BQ24650 LiFePO4, Li-Ion, and Lead Acid Charging Application Circuits

Lucas Reed
Prodigy 20 points
Other Parts Discussed in Thread: BQ24650

Hi, I am looking to use the BQ24650 to charge a variety of different battery chemistry (LiFePO4, Li-Ion, and Lead Acid) from a solar panel. I reviewed the application circuits for charging these different types of batteries and noticed that the LiFePO4 and Lead Acid circuits were almost identical. I was under the impression that Lithium and Lead Acid batteries have very different charging patterns/protocols, so I am wondering why the application circuits are so similar?

  • 0
    TI__Expert 5565 points
    The example application circuit in the datasheet will work for lithium and lead acid batteries. However, the circuit in the datasheet is not optimal for charging lead acid batteries. There is an app note on how to configure the bq24650 for lead acid charging: www.ti.com.cn/.../slva437a.pdf
  • 0 in reply to Smriti B
    Prodigy 20 points

    Thanks for the response! I am still a little confused though. Does this example application implement the correct charge methods to keep a lithium cell 'healthy' or is it a general 'brute force' charge method? I guess I am still confused because the link provided for the lead acid charging is nearly incidental to the lithium example. How can they both have the same circuit schematic/setup when I thought they both require different charge methods?

  • 0 in reply to Lucas Reed
    TI__Expert 5565 points
    There is more than one method to charge a lead acid battery. The app note discusses the pulse current charging method. If you look closely at Fig 2 in the app note, you will that there are significant changes in the application schematic (see VFB, TS, and STAT2 pin) when compared to Fig 1 in the datasheet.