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BQ2057C: When the battery is discharged, the power consumption of this chip and surrounding components

Annie Liu
Genius 10295 points
Part Number: BQ2057C
Other Parts Discussed in Thread: BQ25170

Hi Team,

It is 4.2V lithium battery. The actual charging resistance used by the customer is 20R. The test values and schematic diagrams when powered by batteries are shown in the following figure:

When the battery voltage is different, the test voltage of each point also changes. That is, the current through R20 is 0.2mA, and the current through R23 is 0.191mA. Is there any way to reduce the power consumption of this part?

Thanks,

Annie

  • 0
    TI__Guru 70336 points

    Hello Annie

    The BQ2057C is a very old linear charger with high external parts count.  With charging resistance of 20R the charge current will be 5mA.

    We have several new devices that will provide better performance, the BQ25170 is one possible option.

    Do not have a solution to reduce power consumption on BQ2057C. 

  • 0 in reply to Bill Johns
    TI__Genius 10295 points

    Hi Bill,

    Customer has paid attention to this chip, but this chip supports a minimum charging current of 10mA. If the 4.2V Li-on charging current is 10mA, the Riset is 30kR?

    At 10mA, the charge current is inaccurate or unstable. His battery can only support a maximum charging current of 20mA, while taking into account the power consumption of the board during charging. 

    Please give the power consumption required by this chip when charging at 10mA and 20mA respectively. 

    If the load current is 0.2mA, what is the power consumption of this chip when the battery is discharged?

    Thanks,

    Annie

  • 0 in reply to Annie Liu
    TI__Mastermind 19195 points

    Hi Annie,

    We are supporting this issue over email, I will reach out to you.

    Thanks,

    Nick