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BQ24072: BQ24072 - Battery Removed

Arulprasath A
Prodigy 20 points
Part Number: BQ24072
Other Parts Discussed in Thread: BQ24073

Tool/software:

Dear Team,
               We are using the BQ24072RGTR charging IC in our product. We need to plan for battery removal. During this process, what should be the status of the CE pin on the hardware side?
Are there any specific steps we need to follow for this?

  • 0
    TI__Guru** 105760 points

    Hello,

    Due to the U.S. holiday our response will be delayed, we will respond by end of day tomorrow CST.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    TI__Mastermind 31510 points

    Hello, 

    It is acceptable to leave /CE pulled low at battery removal. The device will transition to performing the battery detection routine as shown in datasheet figure 10-4. If you wish to stop the battery detection routine then pull /CE high to disable charge. 

    Best Regards,

    Garrett

  • 0 in reply to Garrett Kreger
    Prodigy 20 points

    Hi,
       We tried that, but we are facing around a 1V voltage drop at Vout. 

  • 0 in reply to Arulprasath A
    TI__Mastermind 31510 points

    Hello, 

    Apologies for not clarifying this in my last response, but when no battery is attached and charge is disabled Vout will be regulated approx. 1V less than when charge is enabled. 

    • With charge enabled and no battery connected Vout is regulated to ~4.36V.
    • With charge disabled and no battery connected Vout is regulated to ~3.37V.

    If you need Vout to be regulated above a certain voltage you can choose to leave /CE pulled to GND or potentially consider a different part in the BQ2407x family of devices with a different Vout(reg) configuration. In the BQ24072 datasheet there is a device comparison table on page 6 and you will want to refer to the Vout(reg) column. For example, BQ24073 is very similar, but Vout(reg) is 4.4V rather than Vbat + 225mV on BQ24072.

    Best Regards,

    Garrett