Switch Mode Li+ Battery SMBus Charge Controller HB6288Outline
The HB6288 is a high-efficiency, synchronous battery charger, offering low component count for space-constraint, multi-chemistry battery charging applications.
The HB6288 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 HB6288 uses internal input current register or external ILIM pin to throttle down PWM modulation to reduce the charge current.
The HB6288 charges two, three or four series Li+ cells, and is available in a 20-pin, 4×4 mm2 QFN package.
Features
SMBus Host-Controlled NMOS-NMOS Synchronous Buck Converter with Programmable 615kHz, 750kHz, and 885kHz Switching Frequencies
Automatic NMOSFET 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% 20× 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
4×4 mm2 QFN-20 Package
Application
Portable Notebook Computers, UMPC, Ultra-Thin Notebook, and Netbook
Personal Digital Assistant
Handheld Terminal
Industrial and Medical Equipment
Portable Equipment
