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BQ51051B or BQ51013B + BQ24250 for wireless charging solution ?

C.A.
Intellectual 375 points
Other Parts Discussed in Thread: BQ51013B, BQ24250, BQ51051B, BQ51050B

Dear all,


I am currently designing a wireless charger.

First, I thought I would use a BQ51013B for the wireless power with a BQ24250 for charging the battery.

Now, I have just seen the BQ51051B which can combine both features (wireless power + charger).

My question is : with the BQ51051B, could I connect the load while charging ? With the 2 IC solution, I am sure I can do both at the same time but it is not really clear with the 1 IC solution.

Except that the BQ24250 has I2C connection, what are the differences between the 2 designs?

I use a 1 cell LiPo battery (3.7V, 1150mAh) and the system load is up to 150mA but the current can strongly vary over time.


Best regards,

Christian

  • 0
    TI__Genius 14890 points

    Christian,

    Yes, the bq51051B can supply power for the system.  But, it can be complicated to set the desired charge current and the charge termination current.  In most cases, it would not be the best implementation.

    This points out the major difference between the two implementations.  The bq24250 allows setting the system current and battery charge current separately.  This lets the system run at its required current while the battery charging is set separately.  Effectively, the system and charge current are independent.  The input current limit is a combination of the charge current and the system current.

    The bq51050B allows only a single charge current to be set.  This means the charge current would have to be high enough to cover the battery charging and the system power.  This would have to cover peak system power.  But, when the system is running lower, that "extra" current limit would then be used to charge the battery.  This could result in charging the current at a higher rate than you might prefer.

    Regards,

    Dick

  • 0 in reply to Dick Stacey
    Intellectual 375 points

    Dear Dick,

    Thank you very much for your response.

    I understand things better now. So I will design my device with the 2 IC solutions if I have enough room on my PCB.

    Thank you again.

    Best,

    Christian