SLUSBT8 July   2014

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Application Information
  5. 5 Revision History
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 Handling Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Requirements
    7. 7.7 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Power Down
      2. 8.3.2 Power-On Reset
    4. 8.4 Device Functional Modes
      1. 8.4.1 Operation
        1. 8.4.1.1 Input Overvoltage Protection
        2. 8.4.1.2 Input Overcurrent Protection
        3. 8.4.1.3 Battery Overvoltage Protection
        4. 8.4.1.4 Thermal Protection
        5. 8.4.1.5 Enable Function
        6. 8.4.1.6 Fault Indication
  9. 9 Application and Implementation
    1. 9.1 Typical Application Circuit
      1. 9.1.1 Design Requirements
        1. 9.1.1.1 Selection of RILIM
        2. 9.1.1.2 Selection of RBAT
        3. 9.1.1.3 Selection of R(CE), R(FAULT), and R(PU)
        4. 9.1.1.4 Selection of Input and Output Bypass Capacitors
      2. 9.1.2 Detailed Design Procedures
        1. 9.1.2.1 Powering Accessories
      3. 9.1.3 Application Curves
  10. 10Power Supply Requirements
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Trademarks
    2. 12.2 Electrostatic Discharge Caution
    3. 12.3 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • Provides Protection for Three Variables:
    • Input Overvoltage, with Rapid Response in < 1 μs
    • User-Programmable Overcurrent with Current Limiting
    • Battery Overvoltage
  • 30 V Maximum Input Voltage
  • Supports up to 0.3 A Input Current
  • Robust Against False Triggering Due to Current Transients
  • Thermal Shutdown
  • Enable Input
  • Status Indication – Fault Condition

2 Applications

  • Mobile Phones and Smart Phones
  • PDAs
  • MP3 Players
  • Low-Power Handheld Devices
  • Bluetooth™ Headsets

3 Description

The bq24311 is a highly integrated circuit designed to protect Li-ion batteries from charging circuit failures. The IC continuously monitors the input voltage, input current, and battery voltage. The input overvoltage protection immediately removes power from the charging circuit by turning off an internal switch. The input protection limits the system current at the user-programmable value, and if the overcurrent persists, switches the pass element OFF after a blanking period. Additionally, the IC also monitors its own die temperature and switches off if it becomes too hot.

The IC can be controlled by a processor and also provides status information about fault conditions to the host.

Device Information

PART NUMBER PACKAGE BODY SIZE (NOM)
bq24311 WSON (8) 2.00mm x 2.00mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

4 Application Information

typ_sch_lusbt8.gif