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BQ24630: IC suggestion for 12v UPS with lithium ion battery pack

Amir Eshraghi
Expert 1260 points
Part Number: BQ24630
Other Parts Discussed in Thread: BQ24610, BQ25713

Hi

I am trying to find IC which can do below design specs:

1.  An uninterrupted power supply system with system output of 12V,8Amp.

2. 12V Li-ion battery 20AH 

3. Be able to charge Battery while it is powered.

4. Able to use the device while charging. 

5. Be able to know when the battery is low and when is charging 

6.  Like to use pre-pack li-ion battery but no can be changed.

7. I2c or SPI communication is nice to have.

Please let me know if you have any questions. 

Thank you

  • 0
    TI__Mastermind 24075 points

    Hi Amir,

      Couple of questions:

    • SYS rail to be regulated to 12V?
    • 3S Li-ion battery for max charge regulation voltage of 12.6V?
    • 8A charge current
    • Input voltage?

    The BQ24630 (For Li-ion I would recommend BQ24610 as it has higher switching frequency allowing you to use a smaller inductor) part you have selected is for direct powerpath, where the SYS rail is the output of a diode or configuration, with input being either the input or the battery. Downside is that VSYS will either be tied directly to input adapter or directly to battery.

    BQ24630/BQ24610 are standalone chargers, and for an application where adapter can be unplugged, a dc/dc converter will be required to externally regulate the SYS to a specific voltage.

    One other option is to use the BQ25713/710 which are I2C/SMBus control respectively. 8A charging is very high so charge controller (external FETs) will be required as power dissipation inside the IC package for such a high charge current, means it is not good to use an integrated FET charger.

  • 0 in reply to Kedar Manishankar
    Expert 1260 points

    Hi Kedar,

    Thanks for the quick reply. Below is the answer to your questions.

    1. The system (Load ) regulated voltage will be 12V.

    2. That is correct if we use 3.7v Li-ion battery we need 4 series cells and some in parallel (depend on AH) to get 14.1V

    3. No, I do not need to charge the battery with 8A, maybe 1.5A-2A. I need 8amp on my 12v regulated output for my load (system output) 

    4. I was thinking 24V - 8Amp

    This will be a UPS system that will run while is charging.  

    Quick question regarding battery: Can we use this chip with a battery pack with BMS, or I need to connect each battery individually for load balancing.

    Thank you

  • 0 in reply to Amir Eshraghi
    TI__Mastermind 24075 points

    Hi Amir,

    •     I would recommend the BQ24610 IC. As it has direct powerpath, as long as adapter can supply the SYS load + charge current, then there will be no issue as for UPS adapter is always present in system. I would connect an external buck converter in the SYS path to step down input voltage to the regulated 12V VSYS you require.
      • Like I mentioned earlier, using an integrated charger will result in too much power dissipation internal to the package so they do not support such high load.

    • When looking at battery voltage, refer to max charge regulation voltage, and not nominal charge voltage, as you will configure your IC for max charge regulation voltage. Generally 3.7V = Li-ion nominal, and 4.2V = Li-ion max charge regulation voltage.
    • BQ24610 can accomplish this charge current

    You can use this chip with BMS. I would take a look at our gauge/protector portfolio here:https://www.ti.com/power-management/overview.html

    Once you select a part, please post another question to E2E referencing the specific part number, and the expert supporting those parts will be able to help you.