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BQ4050: spare battery

Antonio Pozzi26
Prodigy 20 points
Part Number: BQ4050

Hello,

we have design a portable device with the BQ4050, powered by a 3S Lipo battery. The customer asks us to be able to change the battery with a spare one, but in doing so the chip probably goes into power down and comes out only by attacking the charger (because I suppose "To wake up the device, a voltage> Charger Present Threshold must apply to the PACK pin").
Is there any possibility to power up the device without connecting it to the charger (of course if a charged battery is connected to it)?

Thanks.

Antonio.

  • 0
    TI__Guru** 105590 points

    Hello Antonio,

    Could you clarify the application? The bq4050 is a pack side gauge, is the battery being taken out of the pack then reinserted to the system or being charged?

    To wake up the device you can connect the BAT+ and PACK+ briefly.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Prodigy 20 points

    Hello Wyatt,

    I Apologize for the delay in answering.
    The application does not have a battery pack (box with battery and protection circuit).
    What we want to change are only the three elements of the battery.
    I know the wake button on the development board, but I can't use a button.
    I have used the BQ4050 because it has got many usefull feactures (overdischarge protection, cell balancing, gauge meter, and so on).

    But I think I have found a solution: if I put a 0.1uF capacitor between the drain and gate of the DSG mosfet, I get a short activation of this mosfet at only the first connection of the battery.
    This is enough to start the chip (the "my wake button").
    However if there is any other solution I am ready to consider it.

    Thank you very much for your time.

    Antonio

  • 0 in reply to Antonio Pozzi26
    TI__Guru** 105590 points

    Hello Antonio,

    I'm not sure I fully understand your application, but If this works for your application I don't think any harm can come from placing a capacitor there unless there is lots of noise on your load.

    Sincerely,

    Wyatt Keller