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BQ24210: Higher load current or alternative part?

Ioannis Charalampidis
Prodigy 40 points
Part Number: BQ24210
Other Parts Discussed in Thread: BQ24074, TPS22919, TPS22917

Hello everyone,

I am working on a design with some complicated power paths and I stumbled upon BQ24210, since it matched perfectly my use case. However the IREV_LIMIT parameter (~200mA) is too low for my case. I have been searching like crazy for the past days but I can't find a similar component with higher values, so I wanted to pick the brains of the community :) 

To be more verbose, in my design I have a "Rail Voltage" that varies from 2.0 V up to 5.5V and various components either supply voltage on that rail, or collect from it.

One of these components is the LiPo battery charger/controller. BQ24210 does it's job exactly as advertised : When VRAIL > VBAT it enters charging mode, and when VBAT > VRAIL, it enters load mode. 

Even though my system load is typically below 200mA it can peak to 800mA on certain conditions. Unfortunately, when this happens BQ24210 caps the maximum current down to 50mA. Unfortunately, the  IREV_LIMIT parameter is internally set and therefore I assume that I cannot do anything about it.

So here is my question : is there any way to change the load current limit on BQ24210? Or is there any similar component with higher current limit? Or is there any alternative design that I could try in order to achieve the same result?

Here is the related part of schematic for reference:

  • 0
    Prodigy 40 points

    Any ideas? I am also OK with alternative designs. Perhaps a voltage comparator that selects either a charger or a battery monitor IC?

    But I bet there must be a single IC that can do this...

  • 0 in reply to Ioannis Charalampidis
    TI__Guru* 75656 points

    Hello

    This feature is not widely used.  More common is the Power Path devices such as BQ24074, that can charge the battery and support load at the same time.  But if additional current is needed it can be drawn from battery.

    Another option would be an external discrete circuit that would connect battery to input.  This would be under the control of some signal that know when the 800mA load is needed.

    Increasing the BQ24210 Reverse current will not be possible. 

  • 0 in reply to Bill Johns
    Prodigy 40 points

    Hello Bill,

    Thanks for your answer! That's a tad unfortunate for me, but that's OK.

    I have already considered adding a FET to connect the battery to the input on demand, exactly as you described, and I will most probably go with it... I was just surprised to see that such an IC existed, but BQ24210 was only one of a kind and not part of some series...

    Thanks again for your time,

    Best Regards,
    Ioannis

  • 0 in reply to Ioannis Charalampidis
    TI__Guru* 75656 points

    Hi Ioannis

    A device to consider in the external circuit in place of FET would be the TPS22919 this is a load with some additional short circuit protection.  Other devices in the series have additional features.

  • 0 in reply to Bill Johns
    Prodigy 40 points

    Hello Bill,

    Yeah I was actually planning to use TPS22917, since I already use it in the same design. But thanks for the recommendation! I do like the self-protection of TPS22919, so I might spend some time going through these series once again.

    I am a big fan of these series :)

    Thanks again,
    Ioannis