The bq24640 device 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 0 V with current set on the ISET pin.
When the super capacitor voltage reaches the programmed target voltage, charge current begins
The bq24640 enters a low-current sleep mode
(<15 µA) when the input voltage falls below the output capacitor voltage.
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.
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