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BQ24170: Smart battery charger IC

hafedh hamouda
Prodigy 130 points
Part Number: BQ24170
Other Parts Discussed in Thread: BQ25713, BQ24773

Dear Ti Team,

Could you help me find the best IC that can recharge the battery and powered the system(host) at the same time.

When I disable the USB key, the battery must powered the system.

Thank you!

BR

Hafedh

  • 0
    TI__Guru**** 167196 points
    Hamouda,

    I need more information to help.

    What is the battery chemistry (e.g. LiIon) and configuration (i.e. 1 series, 1series2parallel, 2 parallel, etc.)?
    What is the battery's capacity?
    What is your input voltage? Will you power from USB port?
    Do you have a host processor to control the charger or does it need to be stand alone?
    What is the end application?

    Thanks.
    Jeff
  • 0 in reply to Jeff F
    Prodigy 130 points

    Dear Jeff,

    Thank you for your message.

    I want to use two battery configuration :

    - Battery LiIon 2 cells parallel , the second soultion use Battery LiIon 2 cells series.

    For the first solution (2 cells parallel) :

    - Termination voltage is 3.75V, Capacity 2Ah for one 1 cell

    For the second solution (2 cell series) :

    -Termination voltage is 7.2V,  Capacity 2Ah for one 1 cell

    I need to power the system from USB port (500mA)

    The charger IC should be stand-alone. The IC should control powering the system and charging battery in the same time. When I disable the USB port, the battery should power the system automatically!

    The main application system requires a supply voltage 3.3V and consumption current 500mA max.

    Thank you in advance for your support

    BR

    Hamouda

  • 0 in reply to hafedh hamouda
    TI__Genius 10240 points
    Hamouda,

    Is the 3.75V or the 7.2V the nominal voltage or fully charged (termination) voltage of the Li-ion battery? Please double check the battery specification.
  • 0 in reply to ezhao
    Prodigy 130 points

    Dear Eric,

    Actually, I want to study two case :

    - 2 cells series battery with termination voltage 7.2V

    -2 cells parallel battery with termination voltage 3,75V

    Then, after power management battery, I wil add DC switching regulator or LDO to supply my system with 3.3V

    Best regards

    Hafedh

  • 0 in reply to hafedh hamouda
    TI__Mastermind 25800 points
    Hey hafedh,

    Consider using the BQ25713 to test the two use cases.

    This is a buck-boost charging controller. If you are using a 5V USB input, you will need to step up the voltage in order to charge the 7.2V series configuration.

    If your input source is a higher input voltage, consider using the BQ24773. This is buck multi-cell li-ion charge controller that is programmable via I2C.


    Regards,
    Joel H
  • 0 in reply to Joel Hernandez II
    Prodigy 130 points

    Dear Joel,

    Thank you for your message.

    Currently, I need anaother IC charger for power management two cell parallel battery.

    Unfortunaltely, all IC charger designed for power management series battery!

    Do you have any solution to charge two parallel battery.

    Specification :

    - Termination voltage for each battery is 4.2V 

    - capacity 2.45 Ah for each battery

    Thank you

  • 0 in reply to hafedh hamouda
    TI__Mastermind 25800 points
    Hey hafedh,

    You can use those same chargers I recommended above to charge parallel battery packs. Because they are connected in parallel, the batteries tend to self-balance as they will be sharing the same charging current and charging voltage.


    Regards,
    Joel H