Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

  • State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 65 subscribers
  • Views 606 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

LM25116: Using the IC for a 7S lipo charger

Bas Vuyk
Prodigy 90 points
Part Number: LM25116

I'm currently in the process of designing a 7-cell lipo charger(29.4V), using an external 36V power supply. 

An external circuit will be used to se the max current. As of now, this will be between 5-20Amps. I was wondering if it is at all possible to use the IC in this way? Because it will continuously be working at it's current limit, till the CV part of the charging starts. 

If not, is there an alternative I can use?

  • 0
    TI__Mastermind 23835 points

    Hi,

    I think you might want to also check the battery management ICs that maybe better suited for these type of application.

    http://www.ti.com/power-management/battery-management/charger-ics/products.html

    These ICs may have some features that is specific in terms of each battery chemistry that you are planning to charge

    I hope that helps

    Thanks

    -Arief

  • 0 in reply to Arief Hernadi
    Prodigy 90 points

    Arief Hernadi said:

    Hi,

    I think you might want to also check the battery management ICs that maybe better suited for these type of application.

    http://www.ti.com/power-management/battery-management/charger-ics/products.html

    These ICs may have some features that is specific in terms of each battery chemistry that you are planning to charge

    I hope that helps

    Thanks

    -Arief

    Hi Arief,

    Thanks for the reply. There is already a BMS integrated in the battery. And looking at the available IC's, there is not one usable for my application. 

    My idea is to just use a DC/DC Buck Converter to create a suitable voltage for the battery, in this case 29.4V, and then use a microcontroller to control the current. So upon connecting the battery, the MCU will check the voltage, if it's below a certain threshold, it will 'trickle-charge' the battery, and once it reaches a good voltage, it will apply the full current. This current will be set by the user, and can vary between 5-15 amps. 

    But by reading the datasheet I'm not certain the LM25116 will just follow the voltage of the battery when the current limit is reached, so it acts like a constant current source. Or if it will completly shut down activity for a moment.  

  • 0 in reply to Bas Vuyk
    TI__Mastermind 35170 points

    "But by reading the datasheet I'm not certain the LM25116 will just follow the voltage of the battery when the current limit is reached, so it acts like a constant current source. Or if it will completly shut down activity for a moment. "

     

    Can you please specify the power conditions/requirements?

    Thank you.