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BQ40Z60: Charger Input Requirement

Jerry West
Intellectual 340 points
Part Number: BQ40Z60
Other Parts Discussed in Thread: BQSTUDIO

I am designing a portable instrument that is powered by 4 series LiPo cells producing 16.8 V. The cells are 9000 mAH. My requirement does not require rapid charge or discharge of the cells. My maximum discharge current is about 300 mA. I need to charge the cells in about 12 hours. The large cell capacity is to permit the instrument to operate in the field away from charging power for an extended period.

My question is can the bq40z60 charge the cell stack from 13.75 V cigarette lighter socket or must I implement a voltage boost circuit if charging from a car battery is needed in an emergency. Normally the instrument would be charged from an AC to DC p[owerr module at the operations base.

  • 0
    TI__Guru 73830 points
    The bq40z60 charger is an NVDC type buck charger, so the adapter voltage must be higher than the charging voltage.
  • 0 in reply to ThomasCosby
    Intellectual 340 points

    Please point me to the correct document. I have my BQ40Z60EVM working fine. I need to prepare a method for small quantity manufacturing
    (20 pcs / mo). What files do I need to extract from the EVM and load in my product? Does TI have any hardware I should purchase to make the calibration task easy?

    Jerry West

  • 0 in reply to Jerry West
    TI__Guru* 76230 points
    Hi Jerry,
    Pls reference attached document for calibration.
    www.ti.com/.../slua734a.pdf.

    Since you are just doing 20 boards per month i wouldn't recommend you purchase additional equipment. You can just calibrate and program one after the other using bqstudio. For programming, you extract your golden srec file from the unit you did learning on and use that to program the other devices before doing calibration of hte voltage, current and temperature.

    thanks
    Onyx