1 Features

• 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 I_q
  • < 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.

1. For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application Schematic

4 Revision History

Changes from B Revision (October 2011) to C Revision

• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information sectionGo

Changes from A Revision (May 2010) to B Revision

• Changed descriptions of PH and BTST pinsGo
• Added added text, equations and illustrations from Inductor Selection to PCB LayoutGo
• Corrected equation for caclulating voltage ripple on output capacitorGo