bq24721

bq24721 bq24721C www.ti.com.................................................................................................................................................. SLUS683F – NOVEMBER 2005 – REVISED APRIL 2009 ADVANCED MULTI-CHEMISTRY AND MULTI-CELL SYNCHRONOUS SWITCH-MODE CHARGER AND SYSTEM POWER SELECTOR FEATURES 1 2 High Efficiency NMOS-NMOS Synchronous Buck Converter With User-Selectable 300 kHz or 500 kHz frequency bq24721C Offers Softer Turn-On, Stronger Turn-Off SBS-Like(1) SMBus Interface for Control and Status Communications With Host Programmable Battery Voltage, Charge Current, and AC Adapter Current via SBS-Like SMBus Interface 0.4% Charge Voltage Regulation Accuracy 3% Charge Current Regulation Accuracy 3% Adapter Current Regulation Accuracy Dynamic Power Management (DPM) 2% Accuracy Integrated Charge and AC Adapter 20× Current Amplifier Output 3-Cell and 4-Cell Li-Ion Voltage Regulation 9 V, 12 V–14.4 V, 16 V–19.2 V Battery Pack Voltage Operating Range 0 V–19.2 V AC Adapter Operating Range 8 V–28 V 99.5% Max Duty Cycle Internal Soft Start Integrated 5% 5-V LDO When AC Adapter Applied 6-V Drive Supply Voltage for Increased Efficiency Reverse Battery to Adapter Discharge Protection Battery/Adapter to System Power Selector Function Charge and Adapter Overcurrent Protection Battery Thermistor Sense, TS, Comparators Available in 32-Pin 5x5-mm QFN Package (1) SBS-Like interface is not 100% SBS compliant. SBS-Like inter...