SLUSEC9B October 2020 – July 2024 BQ25618E , BQ25619E
PRODUCTION DATA
Refer to the PDF data sheet for device specific package drawings
The device deploys NVDC architecture with BATFET separating system from battery. The minimum system voltage is set by the SYS_MIN bits. Even with a fully depleted battery, the system is regulated above the minimum system voltage.
When the battery is below the minimum system voltage setting, the BATFET operates in linear mode (LDO mode), and the system is typically 180 mV above the minimum system voltage setting. As the battery voltage rises above the minimum system voltage, the BATFET is fully on and the voltage difference between the system and battery is the VDS of the BATFET.
When battery charging is disabled and above the minimum system voltage setting or charging is terminated, the system is always regulated at typically 50 mV above the battery voltage. The status register VSYS_STAT bit goes to 1 when the system is in minimum system voltage regulation.