The BQ24640RVAT is a highly integrated Switched-mode Super Capacitor Charge Controller. The device offers a constant-frequency synchronous PWM controller with high accuracy charge current, voltage regulation and charge status monitoring. The bq24640 charges a super capacitor in two phases: constant current and constant voltage (CC/CV). The device can charge super capacitors from 0V with current set on the ISET pin. When the super capacitor voltage reaches the programmed target voltage, charge current begins tapering down. The bq24640 has an input CE pin to enable and disable charge and the STAT and PG output pins report charge and adapter status. The TS pin on the bq24640 monitors the temperature of the capacitor and suspends charge during hot and cold conditions.
● 600kHz NMOS-NMOS synchronous buck controller
● Over 90% Efficiency for up to 10A charge current
● Accuracy - ±0.5% Charge voltage regulation and ±3% Charge current regulation
● High integration internal loop compensation and internal digital soft start
● Input overvoltage protection
● Capacitor temperature sensing hot and cold charge suspend
● Thermal shutdown
● 30ns Driver dead time and 99.5% Maximum effective duty cycle
● Automatic sleep mode for low power consumption
