1 Features
1• Battery Thermistor Sense for JEITA Guideline
Compatible Charger
• 600-kHz NMOS-NMOS Synchronous Buck
Converter
• Stand-Alone Charger Support for Li-Ion or Li-
Polymer
• 5-V–28-V VCC Input Operating Range and
Supports 1 to 6 Battery Cells
• Up to 10-A Charge Current and Adapter Current
• High-Accuracy Voltage and Current Regulation
– ±0.5% Charge Voltage Accuracy
– ±3% Charge Current Accuracy
– ±3% Adapter Current Accuracy
• Integration
– Automatic System Power Selection From
Adapter or Battery
– Internal Loop Compensation
– Internal Soft-Start
– Dynamic Power Management
• Safety Protection
– Input Overvoltage Protection
– Battery Detection
– Reverse Protection Input FET
– Programmable Safety Timer
– Charge Overcurrent Protection
– Battery Short Protection
– Battery Overvoltage Protection
– Thermal Shutdown
• Status Outputs
– Adapter Present
– Charger Operation Status
• Charge Enable Pin
• 6-V Gate Drive for Synchronous Buck Converter
• 30-ns Driver Dead-Time and 99.5% Maximum
Effective Duty Cycle
• 24-Pin, 4-mm × 4-mm QFN Package
• Energy Star Low Quiescent Current Iq
– < 15-μA Off-State Battery Discharge Current
– < 1.5-mA Off-State Input Quiescent Current

2 Applications
• Netbooks, Mobile Internet Devices, and Ultra-
Mobile PCs
• Industrial and Medical Equipment
• Personal Digital Assistants
• Handheld Terminals
• Portable Equipment

3 Description
The bq2461x device is a highly integrated, Japan
Electronic Information Technology Association
(JEITA) guideline-compatible, Li-ion or Li-polymer switched-mode battery charge controller. The device
offers a constant-frequency synchronous switching
PWM controller with high-accuracy charge current
and voltage regulation, charge preconditioning, termination, adapter current regulation, and charge
status monitoring
The bq2461x charges the battery in three phases: preconditioning, constant current, and constant
voltage. Charge is terminated when the current
reaches a minimum user-selectable level. A
programmable charge timer provides a safety backup. The bq2461x automatically restarts the
charge cycle if the battery voltage falls below an
internal threshold, and enters a low quiescent current
sleep mode when the input voltage falls below the battery voltage.