Datasheet Texas Instruments BQ24721C — Datenblatt

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 APPLICATIONS 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 20Г— 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 DESCRIPTION
The bq24721 is a high efficiency synchronous battery
pack charger with high level of integration for portable
applications. This device implements a high
performance analog front-end that interfaces to the …