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.