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BQ24232 ILIM, TIM, ITERM, and ISET clarifications

Waleed NA
Prodigy 10 points
Other Parts Discussed in Thread: BQ24232

Hello,


I'm trying to implement BQ24232 to my 5v @ 500mA USB charger circuit design, and let me say that I have battery of liploy of 3.7v with 100mAh:

1. According to the battery's datasheet I got the standard charge value is 0.5C, and for the fast charge it's 1C. Should I assume that the recommended Fast-charge current approximately equal to 100mA?

2. What is the recommended Termination Current based on previous question?can i keep it to 10% of fast charge current?or more?

3. What is the recommended Safety timer duration?

 

Appreciate your prompt advice engineers

 

Cheers

 

  • 0
    TI__Genius 13700 points

    Hello,

    After looking over your questions here is some initial feedback:

    1. Yes. The C value used to describe charging is supposed to indicate the capacity. Therefore charging at 1C for your case would be 100mA and charging at 0.5C would be 50mAh for your fast charge current, both of which are supported values by the BQ24232.

    2. A termination current of 10% the fast charge current is seen as a good standard. Keep in mind that if you charge at 100mA this makes the termination current 10mA where if you used 50mA it would be at 5mA. Lowering your termination current will do two things: increase the energy stored in the battery by a small amount and increase the time before charging terminates. You will need to balance the decision between charging time and energy stored to fit your application.

    3. The default timer value of 5 hours will work well. The purpose of the safety timer is that if for some reason the charge cycle does not terminate for one of any number of reasons the charger will shut off to make sure that the battery does not continue to receive charge and create a potentially hazardous situation. A number of the our other devices have safety timers with a similar length.

    Let me know if you have any other questions.