bq2408x 750-mA Single-Chip Li-Ion and Li-Pol Charge Management IC With Thermal Regulation

1 Features

• Ideal for Low-Dropout Designs for Single-Cell Li-Ion or Li-Pol Packs in Space Limited Applications
• Integrated Power FET and Current Sensor for up to 750-mA Charge Applications
• Reverse Leakage Protection Prevents Battery Drainage
• ±0.5% Voltage Regulation Accuracy
• Thermal Regulation Maximizes Charge Rate
• Charge Termination by Minimum Current and Time
• Precharge Conditioning With Safety Timer
• Status Outputs for LED or System Interface Indicate Charge, Fault, and Power Good Outputs
• Short-Circuit and Thermal Protection
• Automatic Sleep Mode for Low Power Consumption
• Small 3×3 mm MLP Package
• Selectable Battery Insertion and Battery Absent Detection
• Input Overvoltage Protection
  • 6.5 V and 10.5 V Options

2 Applications

• PDA, MP3 Players, Digital Cameras
• Internet Appliances and Handheld Devices

3 Description

The bq2408x series are highly integrated Li-Ion and Li-Pol linear chargers, targeted at space-limited portable applications. The bq2408x series offers a variety of protection features and functional options, while still implementing a complete charging system in a small package. The battery is charged in three phases: conditioning, constant or thermally regulated current, and constant voltage. Charge is terminated based on minimum current. An internal programmable charge timer provides a backup protection feature for charge termination and is dynamically adjusted during the thermal regulation phase. The bq2408x automatically restarts the charge if the battery voltage falls below an internal threshold; sleep mode is set when the external input supply is removed. Multiple versions of this device family enable easy design of the bq2408x in cradle chargers or in the end equipment, while using low cost or high-end AC adapters.

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

Typical Application Circuit

4 Revision History

Changes from D Revision (August 2009) to E 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

5 Device Options