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BQ26200: Questions of BQ26200

Jimmy Lai
Expert 6845 points
Part Number: BQ26200
Other Parts Discussed in Thread: BQ24105-Q1, BQ25171-Q1, LM51231-Q1

Dear Team,

E-CALL has been evaluated to operate in an environment of -40 to 85 degrees Celsius.
We will use nickel metal hydride battery pack. I hope the charging current can be edited.
Then there are car regulations for charging IC applications in 12V systems
If Vmax. can reach 36V, please recommend it.

Also, I would like to ask which IC is used to convert mainstream 12V system DC/DC to 5V?
The maximum output current is first evaluated at 3A.

Do you have any recommendations for Boost IC (NiMH battery voltage should be at least 3 strings = 3-3.6V)
The voltage will rise to about 9V and the output current is estimated to be about 4A.

 Many Thanks,

Jimmy

  • 0
    TI__Guru*** 146725 points

    HI Jimmy,

    It appears you are asking for 3 different automotive ICs, NiMH charger from 12V for e-call app, buck from 15V to 5V @ 3A and boost from 3-3.6V NiMH to 9V at 4A.  I do not understand the mention of BQ26200 coulumb counter.  Is there a question about that as well?

    For the charger E-CALL application, we have success with the BQ24105-Q1 switching charger, but that 20-V device needs a TVS on the input to protect against 36V.  If the current is low enough, the BQ25171-Q1 linear charger which can withstand up to 40V.

    For the boost from NiMH battery to 9V @ 4A, LM51231-Q1 is synchronous boost controller with external FETs.

    For the 12V to 5A @ 3A buck converter, there are many options.  

    I do not support the coulumb counters or the boost or buck converters.  Do you want me to forward to either the buck or boost teams for their recommendations?

    Regards,

    Jeff

  • 0 in reply to Jeff F
    TI__Expert 6845 points

    Hi Jeff,

    Thanks for your great support.

    May I know do you know the shipping mode of backup battery?

    The E-CALL system requires shipping mode before installation in car.

    The backup battery is in-box e-call system.

    When in shipping mode, the e-call system can't consume the backup battery until plug-in B+.

     

    Can you advise this function for our design? Thanks a lot.

    Many Thanks,

    Jimmy

  • 0 in reply to Jimmy Lai
    TI__Guru*** 146725 points

    Hi Jimmy,

    The charger's I mentioned above do not have a ship mode feature.  So, we can add a NMOS FET with drain at BAT/OUT pin, source at battery and gate tied to the 12-V input.  When the input voltage is applied, the NMOS FET turns on to connect the battery to the charger and system load.  When no input voltage is applied, the NMOS FET is off.

    Regards,

    Jeff