Bq40370

Note: Values below are illustrative; always consult the exact bq40370 device datasheet for guaranteed numbers and conditions.

| Condition | CHG FET | DSG FET | Pack output | |-----------|---------|---------|--------------| | Normal operation | ON | ON | Enabled | | Overvoltage | OFF | ON | Disabled (can’t charge) | | Undervoltage | OFF | OFF (or ON if precharge) | Disabled | | Overcurrent (discharge) | OFF | OFF | Disabled | | Overtemperature | OFF | OFF | Disabled | bq40370

FETs are N-channel MOSFETs, driven with ~10V gate drive (from internal charge pump). Note: Values below are illustrative; always consult the

If the battery has been over-discharged below the UV threshold, the bq40370 enters Shutdown mode. Connecting a charger to the PACK+ pin with >9V typically "wakes" it up by activating the BATFET. If this fails, check the REG25 pin. If REG25 is 0V with >6V on BAT, the chip is physically dead. | Condition | CHG FET | DSG FET

Environmental tests:

Safety compliance:

The bq40370 is a Li-Ion / Li-Polymer battery pack manager with a CEDV (Compensated End of Discharge Voltage) gas gauge. It integrates:

It is designed for 2-series (2S) to 4-series (4S) battery packs, commonly used in:

Note: The bq40370 is a ROM-based device (firmware is fixed in ROM, not flash-programmable). Configuration is done via data flash parameters over I²C.