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BQ4050 and BQ34Z100-G1: which one is the most suitable for my application?

C.A.
Intellectual 375 points
Other Parts Discussed in Thread: BQ4050, BQ34Z100-G1, BQ34Z100

Dear all,


I come again here before starting my design. I already gave valuable answers to my questions and I would like to thank you again.


So, I will start designing a module with a 1-cell Li-ion (maybe Li-Po) which can be charged and have a fuel gauge to display the state of charge on LEDs. This device will not have any uC/uP, that is why I have to choose carefully the gas gauge in order to have good user experience despite we do not have uC/uP.


Someone from TI already told my that I can use the BQ34Z100-G1 without uC with less features. After checking again, the BQ4050 might also meet my specification.


I have some questions:

- What is the diffence between "implentation: pack or system" when I see device in the list: http://www.ti.com/lsds/ti/power-management/battery-fuel-gauge-products.page#p2192=Battery%20Management%20Unit ?

- Can the BQ4050 also be used without uC (with less feature) like the BQ34Z100-G1 ?

- The BQ4050 acts also as protection. So, would it be useful to have a second protection such as BQ297xx if the BQ4050 fails ?

- If I use the BQ4050, is it mandatory to put a button to display the state of charge? I read that I need to give a high-to-low transition to this pin, but is it possible to have LED permanetly lit ? If no, I also see I can have a flash option when battery is almost empty, is it only to flash LED instead of putting ON? I am talking about the SLUUAQ3 document, section 8.1. It would be nice to inform the user that the battery is almost empty without pressing on a button...

- Finally, if I understand correctly, with the BQ4050, only one LED is turned ON to indicate the state of charge? Because, when I see the LED schematic, it is impossible to turn on some LED together since they are anti-parallel.

Sorry for the long post and thank you in advance. It is my first battery charger design.

Best regards,

Christian

  • 0
    TI__Guru 73830 points
    Christian,
    Either the bq34z100-G1 or the bq4050 can be used without a host and both of them can support a 1S configuration. The bq34z100-G1 is an Impedance Track device and the bq4050 uses the CEDV algorithm. The bq34z100 can support pack-side or host-side configurations and update the Ra table and Qmax when the new cells are attached. The bq4050 is designed for pack-side, but it will update FCC when a new set of cells are attached. The parameters are not opened up as much as they are on the bq34z100 to allow the new cells to be as quickly. FCC will update, but the amount that it is updated each cycle is limited. Both devices support LEDs. The bq4050 can support up to 5 LEDs. The LEDs are multiplexed and only require three pins on the device. Both device require that the LED button be pressed to activate the display, except when charging. They can be set to display the SOC continuously while charging.
    Tom
  • 0 in reply to ThomasCosby
    Intellectual 375 points

    Dear Tom,


    Thank you very much. So, as I expected, both are similar for my application. I guess I will use the BQ34Z100-G1 for my prototype (and get a first experience with this kind of circuit) because I can easily find a eval board (BQ4050 eval board is less available where I usually order) and it seems a little bit easier to work with!


    Thank you again for all your advices.


    Best,


    Christian