The bq24725 is a high-efficiency, synchronous battery charger, offering low component count for space-constraint, multi-chemistry battery charging applications.
●The bq24725 uses two charge pumps to separately drive n-channel MOSFETs (ACFET, RBFET and BATFET) for automatic system power source selection.
●SMBus controlled input current, charge current, and charge voltage DACs allow for high regulation accuracies that can be programmed by the system power management micro-controller.
●The bq24725 uses internal input current register or external ILIM pin to throttle down PWM modulation to reduce the charge current.
●The bq24725 charges two, three or four series Li+ cells, and is available in a 20-pin, 3.5 × 3.5 mm2 QFN package.
● SMBus Host-Controlled NMOS-NMOS Synchronous Buck Converter with
●Programmable 615kHz, 750kHz, and 885kHz Switching Frequencies
● Automatic N-channel MOSFET Selection of System Power Source from
●Adapter or Battery Driven by Internal Charge Pumps
● Enhanced Safety Features for Over Voltage Protection, Over Current
●Protection, Battery, Inductor and MOSFET Short Circuit Protection
● Programmable Input Current, Charge Voltage, Charge Current Limits
● ±0.5% Charge Voltage Accuracy up to 19.2V
● ±3% Charge Current Accuracy up to 8.128A
● ±3% Input Current Accuracy up to 8.064A
● ±2% 20x Adapter Current or Charge Current Amplifier
●Output Accuracy
● Programmable Battery Depletion Threshold, and Battery LERAN Function
● Programmable Adapter Detection and Indicator
● Integrated Soft Start
● Integrated Loop Compensation
● Real Time System Control on ILIM pin to Limit Charge Current
● AC Adapter Operating Range 9V-24V
● 5µA Off-State Battery Discharge Current
● 20-pin 3.5 × 3.5 mm2 QFN Package
● APPLICATIONS
● Portable Notebook Computers, UMPC, Ultra-Thin Notebook, and Netbook
● Personal Digital Assistant
● Handheld Terminal
● Industrial and Medical Equipment
● Portable Equipment
●PowerPAD is a trademark of Texas Instruments.
