Описание
The bq24640 is highly integrated switch-mode super capacitor charge controller. It offers a constant- frequency synchronous PWM controller with high accuracy charge current and voltage regulation, and charge status monitoring. The bq24640 charges super capacitor in two phases: constant current and constant voltage. The charge starts from down to 0V with current set on ISET pin. The charge current starts tapering down, when the voltage on VFB reaches an internal reference. The bq24640 enters a low-current sleep mode (<15µA) when the input voltage falls below the output capacitor voltage. The bq24640 has input CE pin to enable and disable charge, and two output pins, STAT and PG, to report charge and adapter status. The bq24640 has TS pin to monitor the temperature of the capacitor and suspend charge during HOT/COLD conditions.
- ±0.5% Charge Voltage Regulation
- ±3% Charge Current Regulation
- Internal Loop Compensation
- Internal Digital Soft Start
- Input Over-Voltage Protection
- Capacitor Temperature Sensing Hot/Cold Charge Suspend
- Thermal Shutdown
- Adapter Present
- Charger Operation Status
- <15µA Off-State Super Capacitor Discharge Current
- <1.5mA Off-State Input Quiescent Current
- Memory Backup System
- Industrial UPS system and Power Transient Buffering
- Bridge Power to Buffer the Battery
