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BQ24610 - Using the battery-pack as load supply all the time?

Stefan Knieling
Prodigy 30 points
Other Parts Discussed in Thread: BQ24610, BQ24735

Hi! I want to use the BQ24610 for following application:

We develop a High-Power LED Light which is powered by a 4-cell Lithium Polymer battery- pack. The battery-pack should be charged by a PoE DC/DC Controller which can deliver about 24W continuous. This power isn’t enough for the High-Power LED circuit, so i want to use the battery pack as a puffer…means the power for the LED circuit should be taken from the battery-pack all the time.

My question: Is it possible to design the BQ24610 circuit in such a way, that the power is always taken from the battery pack although the DC/DC Controller Voltage is higher than the battery voltage?


Meanwhile I don’t think so…so I have the following solution statement:

1.) DC/DC controller output voltage must be controlled, to simulate an absent “AC adapter”.

2.) Charging the battery-pack: Load is switched off; set CE-Pin HIGH to enable charge.

3.) SOC of battery-pack is near by 100%; set CE-Pin LOW; set “AC Adapter”-voltage 0V to supply the High-Power LED’s by the battery-pack.

In this case the battery-pack would be charged when the load is turned off and it is not possible to charge the battery-pack when the load is turned on….

I hope you guys have got my problem, I hope it is an error in reasoning … so is there any chance to use the battery pack as power supply all the time, whether the AC Adapter is plugged in or not?

Thanking you in anticipation,

Steve from Austria  

  • 0
    TI__Guru 56650 points

    Please check the turbo boost charger bq24735 or a NVDC architecture charger.

  • 0 in reply to Wang5577
    Prodigy 30 points

    Ok, thank you very much, i will check the bq24735....so the bq24610 doesn't have a supplement mode and would be the wrong choice for my application?

    Some more facts about our project:

    Adapter Input should be 21,4V and 1,12A. We use a 4-cell battery-pack and the load (High-Power LED circuit) need a constant current about 3,15A for the light intensity we want to achieve.

    So the battery-pack has to work in supplement mode for a longer time...is the turbo-boost mode function of the bq24735 able to work for a longer time?

  • 0 in reply to Stefan Knieling
    TI__Guru 56650 points

    If the setup is same as the typical application circuit  of bq24610 datasheet, the bq24610 will run to supplement mode after the input source voltage is crashed to the battery voltage. If use bq24610 as a NVDC charger (the system load is connected to buck circuit output), the charge can have a supplement mode without input source crash. There is an application note talks about the NVDC without input source (solar panel) crash.   http://www.ti.com/general/docs/lit/getliterature.tsp?baseLiteratureNumber=slyt439

    After 175s boost mode operation, the bq24735 will recheck the turbo mode condition. If the turbo mode (supplement mode) condition is still there, it will run boost mode again.