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Isys of BQ24190

Masami Michino
Genius 5070 points
Other Parts Discussed in Thread: BQ24190


Dear, All

I have a question about current limit of BQ24190.

Question 1
The OUTPUT current of Isys(4.5A) is listed in "Recommended Operating Conditions" of the data sheet, where is the limitted circuit?

Question 2
"Discharging current with internal MOSFET "of Ibat is listed with 9A peek, where is the limitted circuit?
Is this limitted circuit same as Ibatfet_ocp(System over load threshold)?

Question 3
Please tell me for differences between Isys(4.5A) and "continuous(6A)" of Ibat(Discharging current with internal MOSFET).

Thanks, Masami M.

  • 0
    TI__Expert 8690 points
    Hi Masami,

    4.5A is the highest output current that can be supplied to system without a battery. With a battery, you can potentially output more. If system needs more than 4.5A, then battery goes into supplement and BATFET can have an average output of 6A on top of the 4.5A the converter can supply.

    It is not recommended to go beyond 4.5A average SYS current because you won't have enough input power to charge the battery and power the system at the same time. When battery is in supplement, BATFET can output up to 9A peak for transients.

    Thanks,
    Steven
  • 0 in reply to Steven Bangdiwala
    Genius 5070 points


    Hi Steven-san,

    Thank you for your reply.
    I understood about the difference between Isys(4.5A) and "continuous(6A)" of Ibat.
    But the location of the limitted circuit is unclear.
    Please answer question 1 and question 2.

    Thanks, Masami M.

  • 0 in reply to Masami Michino
    TI__Expert 8690 points

    Hi Masami,

    No problem. The bq24190 has three places where over-current protection takes place. Input current limit is done through Q1, converter output over-current is done through Q2 HSFET (Ihsfet_ocp), and battery current through Q4 BATFET which controls charging current (ICHG) and discharging current (Ibatfet_ocp). Three layers of over-current protection to ensure good and safe operation.

    Thanks,
    Steven

  • 0 in reply to Steven Bangdiwala
    Genius 5070 points

    Hi Steven-san,

    Thank you for your answer.
    I understood that.

    Thanks, Masami M.