• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 64 subscribers
  • Views 483 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

BQ24707: Setting the output charge regulation voltage is not as expected

BQ24707: Ask for the limit of output current in BQ24707

Dao Thanh Hai
Prodigy 90 points
Part Number: BQ24707
Hello guys,
Could you help me to explain more about the BQ24707 IC?
Now I was successfully configured the IC over SMBus communication and all scenarios happen to seem to be right with the datasheet. However, I was wondering about the max power that the BQ24707 can adapt to charge for the battery.
In my testing, the input power is adapter 20V-3A, the output is two lithium battery which has capacity 5000mAh so I config charge voltage level is 8.4V and set the charge current goes to maximum value. 
I expect that BQ24707 can charge the two battery in 5A current level but when I measured the reality result which is less than 4A. According to the document, the BQ24707 can output charge current higher than 8A if we use output capacitor > 30 ( we had already done that).
So anyone can answer to me that what is maximum charge current output of BQ24707 with 2-cell battery?
Thank you.
 Regards
 

----------------------------------------------------------------------------------------

Personal contact: 0942781347
Company: HomeIQ Việt Nam
  • 0
    TI__Genius 11850 points
    Hi Dao,

    The max charge current is 8.128 A, but there are several reasons that your measured charge current might be lower. A few questions to help debug this:

    1) What is Iin when you observe that the charge current is <4 A? Is your adapter hitting the 3 A current limit?
    2) Do you have a system load connected, or is it only the adapter, the BQ24707 charger, and the 2-cell battery?
    3) What is the voltage on the ILIM pin? What resistor values are you using for the resistor divider?
    4) Are you using one of our EVMs, or are you using your own circuit?

    Best Regards,
    Angelo
  • 0 in reply to Angelo Zhang87
    TI__Genius 10240 points
    Hi Dao,

    We haven’t heard back from you. We are assuming you were able to resolve your issue. If not, just post a reply below or create a new thread if the thread has locked due to time-out.