SLUSET3 December 2022 BQ28Z620
PRODUCTION DATA
The BQ28Z620 device manages its supply voltage dynamically according to operating conditions. When VVC2 > VSWITCHOVER– + VHYS, the AFE connects an internal switch to BAT and uses this pin to supply power to its internal 1.8-V LDO, which subsequently powers all device logic and flash operations. Once VC2 decreases to VVC2 < VSWITCHOVER–, the AFE disconnects its internal switch from VC2 and connects another switch to PACK, allowing sourcing of power from a charger (if present). An external capacitor connected to PBI provides a momentary supply voltage to help guard against system brownouts due to transient short-circuit or overload events that pull VC2 below VSWITCHOVER–.