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BQ24650: please advise if this device can meet the following requirements

Shai Berman
Mastermind 7400 points
Part Number: BQ24650
Other Parts Discussed in Thread: BQ25703A, BQ25606

Hello team,

I have a customer who has the following requirements:

  • The battery chemistry is Li-Ion
  • Input voltage is 5 to 5.5V (USB to the solar panel)
  • We need to supply 12V to the motor, so we need a boost as well. Since we're a little short on space it will be nice to have a charger with a DC2DC inside
  • the current the solar panels provide is 600mA. The USB charger provides 2A. The charger needs to know to work with these voltages and to charge a 10Ah or 20Ah Li-Ion battery pack (18650 in 4 or 6 cell configuration)

the minimum voltage is USB voltage, preferably slightly lower. The maximum voltage should be higher than 5.5V, but other than that is not important.
The charger connects both to a USB charger, and to a solar panel. So if it employs MPPT (maximum solar power) all the better.

can you please advise if this device can be suitable for this kind of application and if you have any other suggestions they are welcome, thanks.

Kind regards,

Shai

  • 0
    TI__Mastermind 19430 points

    Hello Shai,

    The bq24650 is a buck charge controller. The input voltage needs to be higher than the output voltage in order to charge the battery. 

    If you are having a 4s battery with 4.2V/cell, then the battery voltage would be 16.8V. The input voltage would need to be higher than that. 

    With 5 to 5.5 V supply (usb/solar panel), you will need to add a boost converter at the output of the  supply to boost up the voltage first for the charge to charge up the 4s battery.

    I suggest you to have a look at the bq25703A which is a buck boost charge controller. This device can use 5V charge up to 4s battery. 

    If the customer is using 6s configuration, then we only have bq246xx in our portfolio supports 6s battery charging. However, like I said this family of devices use buck topology. 

  • 0 in reply to Jing Zou
    Mastermind 7400 points
    Dear Jing,

    Thank you for your detailed answer.

    Best,
    Shai
  • 0 in reply to Jing Zou
    Mastermind 7400 points
    Dear Jing,

    I have got an update regards the requirement, they are looking for 1 cells and 4 in parallel. That means the voltage stays the same, only the capacity changes (1s4-6p).
    So, in that case, they need a 4.2V charger, please advise if my first recommendation is suitable.

    Thanks and regards,
    Shai
  • 0 in reply to Shai Berman
    TI__Mastermind 19430 points
    Hello Shai,
    In this case, you might want to have a look at bq25606.
  • 0 in reply to Jing Zou
    Mastermind 7400 points
    Jing, The BQ25606 looks quite appropriate thanks a lot.

    Best,
    Shai