SLUSEK7 September 2024 BQ25773
PRODUCTION DATA
Refer to the PDF data sheet for device specific package drawings
When the converter starts up, the BQ25773 reads CELL_BATPRES pin configuration and sets CHARGE_VOLTAGE() and SYSOVP threshold ( 2s – 12 V, 3s – 17 V, 4s – 22 V and 5s – 27V ). Set SYSOVP_MAX=1b can force SYSOVP threshold to be maximum 27V neglecting CELL_BATPRES pin setting. Before CHARGE_VOLTAGE() is written by the host, the battery configuration will follow CELL_BATPRES pin setting. When SYSOVP happens, the device shuts off the converter. FAULT_SYSOVP status bit is set to 1 and latched to 1b. CHRG_OK pin is latched low accordingly until host clear the status bit. The user can clear this status latch-off by either writing 0 to the FAULT_SYSOVP status bit or removing and plugging in the adapter again. After latch-off is cleared, the converter starts again.
During buck HS MOSFET short, SYSOVP is the critical protection to prevent next stage VR power stage from high input voltage. This is implemented through CHRG_OK pin pull down to cut off input source after SYSOVP triggered.