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BQ51050B and 10h timer

Timo Toivola
Prodigy 30 points
Other Parts Discussed in Thread: BQ51050B

BQ51050B is quite optimal chip for charging our device ~1A. However 10h charging timer gives faulty battery error and charging stops until device is removed from charging pad. This ruins our burn in test. In this test device is continuously powered and stays on charging pad consuming more than charging end current, so BQ51050B cannot stop charging normally. Is there any trick to overcome this 10h timer from device side?

  • 0
    TI__Genius 14890 points
    Timo,

    I am checking with our design team for a final answer. Floating the TERM pin will disable termination, but I don't know if it impacts the timer.

    Regards,

    Dick
  • 0 in reply to Dick Stacey
    Prodigy 35 points
    Hello, I have also experienced this behavior: when a unit is left on a charger for an extended time it consumes about 30 mA. THe cut off current is approximately 30 mA as well. If left overnight. per say, the unit will be at a lower voltage than it was the day before. It begins charging successfully however at some point it stops charging and does not reconnect. In testing we too have found that we need to remove the charger and replace it in order to resume a full charge. I was not aware of a timer with this chip and there is little data in the data sheet. If you could share the reply with myself, I would be greatly appreciative. Thank you, Francesca.
  • 0 in reply to Francesca Wignes
    TI__Guru 65716 points
    Hi Francesca
    All our battery chargers have this type of timer as a safety feature.
    The battery should complete charge in 10hr or it is a possible problem.

    In your application the charge current is 300mA and termination is set to 30mA. With system load of 27mA, the unit is probably not terminating charge and the 10hr timer is coming into effect.
    The termination current should be increased to 60mA to make sure that you are terminating charge.