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BQ24610: battery

Ray Ye
Prodigy 20 points
Part Number: BQ24610

Hello, I have two questions about BQ24610.

  1. Regarding the 10.2 Typical Application(Page 26 on datasheet),When I turn off, how do I stop the battery from discharging on these two resistors（R1 and R2)?
  2. When I remove the adapter, how do I to use the battery as a power supply? How the Pin23 on BQ24610 work? do I need a diode just like BAT54C to power supply to the BQ24610?

  • 0
    TI__Mastermind 24075 points

    Hi Ray,

        1. The battery discharge current specification can be found under page 7. section 8.5 Electrical Characteristics, Quiescent currents.

        2. BATDRV is a gate driver for a PFET. The source is connected to the same net as VCC, and when adapter is not connected, ACDRV is pulled up to VCC (turning off the input reverse blocking FETs) and BATDRV is driven by VCC - REGN, which would turn on FET Q3. Section 9.3.8 System Power Selector of the datasheet describes operation of ACDRV and BATDRV in detail.

  • 0 in reply to Kedar Manishankar
    Prodigy 20 points

    Hi Kedar,

       maybe something misunderstand with question #1, I means how to stop the battery discharging to R1 and R2?

    please see the attachment,

  • 0 in reply to Ray Ye
    TI__Mastermind 24075 points

    Hi Ray,

       There will be some discharge current through those resistors. If there is a battery pack in the system whose discharge FET can be closed prior to shipping, then discharge current can be limited as the body diode of DSGFET will block discharge current. To limit discharge, you can size the resistors R1 and R2 larger to decrease the leakage current, but take care not to size the resistor values too high, as this will affect the VFB accuracy.