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BQ25798: Dead battery behavior

Part Number: BQ25798

Tool/software:

Hi, when using the back-to-back FETs to control the input to VBUS, when the battery is in deep discharge and the internal battery protection circuit has detached the cells from the output (BAT & BATP essentially floating) and cannot power the BQ25798, then a power adapter is attached and drives VAC1, is the chip able to power on and turn on the AC1 FETs (ACDRV1) to start trickle charging the battery? Or, is this unrecoverable without opening the case and bootstrapping the battery separately?

  • I found my own answer in the datasheet: "When VVBUS < VVBUS_UVLOZ, VBAT < VBAT_UVLOZ and a voltage higher than VAC_PRESENT is present at either VAC1 or VAC2, the device will be powered from VAC1 or VAC2, depending on which comes first."