SHUTDOWN mode is the lowest power mode of the BQ77307, which can be used for shipping or long-term storage. In this mode, the device loses all register state information, the internal logic is powered down, and the protection FETs are all disabled, so no voltage is provided at the battery pack terminals. All protections are disabled, and no communications are supported. When the device exits SHUTDOWN, the BQ77307 reads parameters stored in OTP (which is programmed by TI), which effectively sets the default values for settings. After device power-up, settings can then be changed by the host writing device registers, if the device has not been SEALED by default.

The device can be configured to enter SHUTDOWN mode automatically based on the minimum top-of-stack voltage, the minimum cell voltage, the maximum TS thermistor temperature, or an excessive die temperature. The shutdown based on cell voltage does not apply to cell input pins not used for actual cells.

When the device is wakened from SHUTDOWN, it requires approximately 10 ms for the internal circuitry to power up, load settings from OTP memory, perform an initial evaluation of conditions relative to enabled protections, and then enable FETs if conditions and settings allow.

The BQ77307 integrates a hardware overtemperature detection circuit, which determines when the die temperature passes an excessive temperature of approximately 120°C. If this detector triggers, the device automatically begins the sequence to enter SHUTDOWN, based on the configuration setting.

The BQ77307 wakes from SHUTDOWN if a voltage is applied at the TS or VC0 pins above a level of approximately 1.2 V. If the shutdown sequence has been initiated, but the device detects the wakeup criteria (either the TS or VCO pin voltage detected high) is present, then the device stays in a "soft shutdown" state until the wakeup criteria is removed (meaning both the TS and VCO pin voltages must be detected low). While in "soft shutdown," FETs and protections are disabled. The device exits "soft shutdown" when conditions allow the device to continue into SHUTDOWN mode. The host can stop the entry into SHUTDOWN mode with a command, and the device restarts operation with a full reset.