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BQ24392: Battery Charger design Support using BQ24392 and BQ25790

Siburaj D S
Prodigy 105 points
Part Number: BQ24392
Other Parts Discussed in Thread: BQ25790, BQ25792, , BQ25150

Hi TI Team,

I need quick support for designing battery charger with below requirements.

  1. Capable to charging from main supply.
  2. Charge minimum 1 Li-Ion battery of cell capacity 250 mAH.
  3. Capability to charge 4 battery modules.
  4. Efficiency 80% minimum.
  5. Charging status indication through LED.
  6. Over voltage and over temperature protection.
  7. Charger should support power mains plug to support countries world-wide.
  8. Control over I2C bus.
  9. Once connected to PC USB port it should be properly detected with configurable device name.
  10. Should be capable of charging from adaptor as well as USB port.

The main components planning to use are listed below.

1. Battery Charger.- BQ25790 / BQ25792

2. Charger detection IC. - BQ24392 

3. Microcontroller to control the Battery charger.- To control battery charger over the I2C bus.

Can you suggest suitable microcontroller which supports above requirements.?

Planning to go with a microcontroller having I2C interface and GPIO. 

Is there any USB interface required for microcontroller ? 

Expecting your immediate reply.

Thanks & Regards,

Siburaj

  • 0
    TI__Guru**** 165986 points

    Hi Siburaj,

    The D+/D- detection of BQ25790 is very similar to that of BQ24392.  Just curious why you need redundant functionality?

    Regarding the microcontroller, we only support the TI battery charge ICs in this forum and do not have the expertise to recommend a microcontroller.  There is no requirement for a microcontroller, other than I2C communication.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Prodigy 105 points

    Hi Jeff,

     

    Thanks for your reply.

    From your reply I conclude that for charger detection we dont need additional BQ24392.

     

    Can you suggest suitable solution for cell balancing and also if we are using BQ25790.

     

    Thanks & Regards,

    Siburaj D.S.

  • 0 in reply to Siburaj D S
    TI__Guru**** 165986 points

    Hi Siburaj,

    I will move your post to the BGP forum as I do not support the balancers.  However, before I do that, I have a question.  What is your input voltage for the BQ25790?  If 5V, with such low charge current (250mAH) you might want a linear charger like BQ25150 family.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Prodigy 105 points

    Hi Jeff,

    We are planning to use input voltage around 5V. 

    If we are not using any cell balancing mechanisms whether it will impact the battery.?

    Regards,

    Siburaj D.S.

  • 0 in reply to Siburaj D S
    TI__Guru**** 165986 points

    Siburaj,

    Are your 4 batteries in parallel or series?  If in parallel, they will self balance and, with such low charge current, you might be able to use a linear charger like BQ25150.  If in series, then you would need a boosting charger like BQ25790.  For batteries in series,  cell balancing is recommended so that the batteries age at the same rate, making for longer life before all batteries are replaced.

    Regards,

    Jeff