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BQ21040: Bq21040 as charger

Shreenidhi Patil
Expert 3936 points
Part Number: BQ21040

Hello Team ,

we are using  Bq21040 as charger for  charging 100 mAh battery  

 

As per my understanding device can be used for providing power to load as well  as battery.

 

I have the following question

 

1)  What will behaviour of the device if the battery is not connected?

 

2) As per my understanding, the device will still provide  4.1/4.2 volts with 1Hz (few hundred mV amplitude ) pulse superimposed over it. please  correct  me  if it supposed  to  behave differently 

  

3)How device will behave if charging current +load current is more than fast charge current?

3 b) if device will reduce load current or charging current?

3c) if device will reduce the battery current then how it will  manage  the constant current phase.

 

  • 0
    TI__Guru* 75786 points
    Hello

    1) What will behavior of the device if the battery is not connected?---Bill J -- Output voltage will be in battery detect mode with low frequency square wave at about 4V with output current up to fast charge current.

    2) As per my understanding, the device will still provide 4.1/4.2 volts with 1Hz (few hundred mV amplitude ) pulse superimposed over it. please correct me if it supposed to behave differently ----Bill J -- This is correct.

    3) How device will behave if charging current +load current is more than fast charge current?---Bill J -- Output voltage will drop, unit is in a current limit mode.
    3 b) if device will reduce load current or charging current?----Bill J -- Output current is fixed and voltage will drop
    3c) if device will reduce the battery current then how it will manage the constant current phase.----Bill J -- The battery will get less current but still get some current during this phase.