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BQ24270: Application questions

Tommy Wan
Prodigy 20 points
Part Number: BQ24270
Other Parts Discussed in Thread: BQ25611D, BQ25890

Dear,

I would like to know if BQ24270 can be used as the follow:

1) 5.0V VDD system/power rail output

2) Automatically manages 3.7V  Li-Ion battery recharging with internal, automatic switching between trickle charging, constant current, and constant voltage modes

3) Allows simultaneous system operation + battery charging if it is connected to a USB charging source during play

4) Automatic battery disconnection when it detects a variety of power supply fault conditions

5) I2C Host MCU connection for Host MCU continuous polling of battery status

6) It can communicate the battery level (i.e. fully charged vs. low battery) to the Host MCU (At a minimum, PMIC battery status must include “Full” and “Low” indications for Host MCU to read and stay in sync with PMIC operation)

Please advise

Thanks

Tommy Wan

2-Jun-2020

  • 0
    TI__Guru**** 167196 points

    Hi Tommy,

    BQ24270 can do all of the above except 6.  However, a never device like BQ25611D has better features and higher efficiency.  BQ25890 has integrated ADC that can report actual BAT pin voltage.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Prodigy 20 points

    Hi Jeff

    Thanks for reply

    For BQ24270, please review and comment

    - its VSYS(REG) System regulation voltage is 3.6V - 3.82V so it may not 5.0V VDD system/power rail output

    - When a fault occurs, a 128 μs pulse is sent out as an interrupt for the host so it may not be Automatic battery disconnection

    - If It cannot communicate the battery level to the Host MCU, ) I2C Host MCU connection for Host MCU may not be continuous polling of battery status

     

    I will study BQ25611D and BQ25890

     

    Thanks

    Tommy Wan

  • 0 in reply to Tommy Wan
    TI__Guru**** 167196 points

    Tommy,

    I do not fully understand the questions.  The SYS output is the MAX of battery voltage or the MINSYS voltage which is typically 3.6V.  It will never by 5.0V.  Faults generate an INT pulse.  The charger cannot report battery level but will report when charge to 4.2V is complete.

    Regards,

    Jeff