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BQ25710: Peak power mode condition

Evan Wang
Genius 9530 points
Part Number: BQ25710

Hi All,

I have some questions about the Peak Power Mode triggered condition. 

For the register 0x31[13:12], what is the condition of the below parameter:

1. 0x31[13]: Enable Peak Power Mode triggered by input current overshoot.

Is the Input current overshoot level equal to ILIM1?

2. 0x31[12]: Enable Peak Power Mode triggered by system voltage under-shoot.

what is the voltage under-shoot level?

Thank you for your help.

BR

Evan

  • +1
    TI__Genius 11385 points

    Hi Evan,

    Thanks for reaching out.

    1. Usually adapter can supply current higher than DC rating for a few milliseconds to tens of milliseconds. The charger employs two-level input current limit, or peak power mode, to fully utilize the overloading capability and minimize battery discharge during CPU turbo mode. Peak power mode is enabled in REG0x31[13:12]. The DC current limit, or ILIM1, is the same as adapter DC current, set in REG0x3F(). The overloading current, or ILIM2, is set in REG0x33[15:11], as a percentage of ILIM1.

    When the charger detects input current surge and battery discharge due to load transient (both the adapter and battery support the system together), or when the charger detects the system voltage starts to drop due to load transient (only the adapter supports the system), the charger will first apply ILIM2 for TOVLD in REG0x31[15:14], and then ILIM1 for up to TMAX – TOVLD time. TMAX is programmed in REG0x31[9:8]. After TMAX, if the load is still high, another peak power cycle starts. Charging is disabled during TMAX,; once TMAX, expires, charging continues. If TOVLD is programmed to be equal to TMAX, then peak power mode is always on.

    2. It should be the minimum system voltage set in register 0x3E.

    Thanks and I hope this helps,

    Peng

    *If my answer solves your question, please press "This Resolved My Issue" on the thread.