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bq76930: 10s1p design change to 10s2p design

HS FAE Germany
Mastermind 32210 points
Part Number: BQ76930
Other Parts Discussed in Thread: BQ78350, BQ78350-R1

Hello, customer plans a design with 10s1p with bq76930 and bq78350. Now he thinks to change to 10s2p. Does he consider something with it?

Regards, Holger

  • 0
    TI__Guru 54715 points

    Hi Holger,

    A 2p battery instead of a 1p battery might be used because the system needs more current or because it needs more capacity (run time).   The 2p battery may use lower power but higher capacity cells than the 1p battery and deliver about the same current capability so the current limits of the battery may not be higher for the 2p vs 1p.  Or the system may need higher current so the limits may be higher.  Often the 2 aspects will come together and while the current limits may not be higher the battery can deliver a higher instantaneous current.  Certainly the design should consider both peak and continuous current and power capability of the board, sense resistor and FETs.  If current is higher the sense resistor may need to be adjusted to keep the levels in the dynamic range of the bq76930 inputs.  Thresholds are configured in the bq78350-R1.  Depending on the current and power levels scaling may be needed.  Refer to the bq78350-R1 technical reference manual for configuration details.

    The presentation at this post may helpful: e2e.ti.com/.../1923729