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BQ51013B: Upgrading to a BQ51050B

David Guest1
Intellectual 350 points
Part Number: BQ51013B
Other Parts Discussed in Thread: BQ51050B

We currently are using a BQ51013B device with a separate Li-ion charger chip, but we are moving onto using the BQ51050B, which will directly charge the Li-ion battery.

We are using a 200R resistor for the FOD to GND currently which works well with our unit - I assume we would use the same value resistor in our design with the BQ51050B.

Also , although I am not sure of its function, I have noticed the additional resistor from RECT to FOD which we have added and used 40.2K- copying a design off the forum.

The rest of the circuit i believe is identical, so in total we have only had to add this additional resistor from Rect to FOD.   Is this correct or should there be other changes ?

  • 0
    TI__Guru* 75906 points

    Hello

    The BQ51050B will work well at higher current 1A but does not scale well to lower currents 100mA.  What charge current are you looking?

  • 0 in reply to Bill Johns
    Intellectual 350 points

    We want it to charge at 1A or more, so that's ok.

  • 0 in reply to David Guest1
    TI__Guru* 75906 points

    Hello

    At 1A the BQ51050B should work well.

    Almost all the values can be reused in the new design. 

    "We are using a 200R resistor for the FOD to GND currently which works well with our unit - I assume we would use the same value resistor in our design with the BQ51050B." -- OK to start with.  Have you run FOD calibration?

    "Also , although I am not sure of its function, I have noticed the additional resistor from RECT to FOD which we have added and used 40.2K- copying a design off the forum." -- R-FOD sets the shape of the received power curve as a function of output current.  R-OS is the off set of this curve, moves it up and down.

    Voltage at the FOD pin is converted in to "Received Power Packet" and set to the TX for FOD calculation.  TX know how much power is set to RX and RX will tell the TX how much power it received.  Missing Power is loss and if this gets too high it will set a fault.