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BQ25601: As BQ25601 has no input source, can SW pin be set to offer no output if only connected to the battery?

Annie Liu
Genius 10295 points
Part Number: BQ25601

Hi,

I designed a color-changing lamp circuit. It works well in normal use, but in shut-down state (still connected to the battery), SW also offers output. My STAT status pin is connected to VSYS, triode is on from the color-changing lamp circuit and continuous power consumption. According to the specification, it should be related to the content of the 8.4.2 section, which has been copied here. Is there a solution?

According to the specification, it seems OK to connect the STAT pin with the REGN pin. Is there any hidden trouble if doing so?


  • 0
    TI__Genius 16245 points
    Annie,
    Based on your description, do you need Battery completely disconnect to SYS if there is no AC adaptor?
    And are your host alive during battery only condition? Can I2C interface workable during battery only condition as well?
    Thanks
  • 0 in reply to Paul Yeh
    TI__Genius 16245 points
    Annie,
    if all your answer is yes, then I will suggest you program BQ25601 enter shipping mode to complete turn off BATFET.

    8.3.8.1 BATFET Disable Mode (Shipping Mode)
    To extend battery life and minimize power when system is powered off during system idle, shipping, or storage,
    the device can turn off BATFET so that the system voltage is zero to minimize the battery leakage current. When
    the host set BATFET_DIS bit, the charger can turn off BATFET immediately or delay by tSM_DLY as configured by
    BATFET_DLY bit.

    Thanks