LT8228 battery charge

Dear Sir,

I want to use LT8228 to design a powerbank with usb type c interface. The battery is 14S. Here I have some questions:

1. Can I use the boost mode to charge the battery?  The battery connect to V1 and the VBUS of type C connect to V2. 

2. How does the LT8228 terminate the charging after the battery is full?

Thanks

David

  • +1
    •  Analog Employees 
    on Sep 4, 2020 4:51 PM 5 months ago

    Hi David,

     

    My name is Chris Gass and I am the product application engineer supporting the LT8228.

     

    1. Yes, you can use the LT8228 in boost mode to charge the battery. Set the V2 side current limit to protect against drawing too much current from the USBC port. Set the V1 current to the battery current. 

    2. The LT8228 implements a standard CCCV profile. Set the V1 feedback voltage to your fully charged threshold. A 14S stack will be between 56 and 59 V, depending on your battery. When the feedback voltage is achieved, the current will fold back. The threshold is actually soft. This means that the current starts to fold back at about 95% of the feedback level.

     

    There is no end of charge indicator. If you have an ADC, you can monitor the IMON pin and the feedback voltage to determine end of charge. 

     

    Let me know if you have more questions,

    Chris

  • Hi Chris,

    That's would be OK for my design. 

    Thanks a lot!

    Best Regards

    David