Texas Instruments BQ24721RHBRG4

Description
The bq24721 is a highly efficient synchronous battery pack charger with a high level of integration for portable applications. It features a high-performance analog front-end that interfaces with the system power management microcontroller through a simplified SBS-like SMBus interface.

Features
High efficiency NMOS-NMOS synchronous buck converter with user-selectable 300 kHz or 500 kHz frequency
SBS-like 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, and 3% adapter current regulation accuracy
Dynamic power management (DPM) with 2% accuracy integrated charge and AC adapter 20x current amplifier output
3-cell and 4-cell Li-Ion voltage regulation
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

Applications
Portable notebook computers
Portable DVD players
Webpads, PC tablets