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Original question:

BQ27427: GPOUT Configuration - Fuel Gauge in Shutdown, System Voltage off in Ship mode

BQ27427: Leakage via GPOUT pin in shipping mode

TonyMotegi
Prodigy 140 points
Part Number: BQ27427

Tool/software:

We have a design where our BQ27427 is always in circuit, even during shipping mode. The product is an IoT device with a small battery and needs to be very efficient at all times. We believe that when our device is off, we are leaking current via the 10K resistor connected between VDD (B3) and GPOUT (A1) as per the datasheet recommended design. Note this GPOUT pin is also connected to an MCU GPIO, which is powered down. The datasheet says this pin should not be left floating, so please advise an implementation where we can reduce leakage current? Why is such a low value (10K) required? Could we use a 1M instead?

  • 0
    TI__Mastermind 27475 points

    Hello,

    This question this question has been assigned and will be reviewed when possible, in the meantime please attach your .gg file.

    Thank you,
    Alan

  • 0
    TI__Guru 62556 points

    You can use a 1.8M instead. It's actually better to use a 1.8M instead of a 10k because the LDO output relies on the capacitor on VDD, which has to be 2.2uF at 1.8V (not just rated, but actual capacitance must be at least 2.2uF at 1.8V, which usually means a capacitor rated at 10V minimum).