SLUS811A November 2008  – June 2015

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Simplified Schematic
  5. Revision History
  6. Pin Configuration and Functions
  7. Specifications
    1. 7.1Absolute Maximum Ratings
    2. 7.2ESD Ratings
    3. 7.3Recommended Operating Conditions
    4. 7.4Thermal Information
    5. 7.5Electrical Characteristics
    6. 7.6Typical Characteristics
  8. Detailed Description
    1. 8.1Overview
    2. 8.2Functional Block Diagram
    3. 8.3Feature Description
      1. 8.3.1Input Overvoltage Protection
      2. 8.3.2Input Overcurrent Protection
      3. 8.3.3Battery Overvoltage Protection
      4. 8.3.4Thermal Protection
      5. 8.3.5Enable Function
      6. 8.3.6Fault Indication
    4. 8.4Device Functional Modes
      1. 8.4.1OPERATION Mode
      2. 8.4.2POWER-DOWN Mode
      3. 8.4.3POWER-ON RESET Mode
  9. Application and Implementation
    1. 9.1Application Information
      1. 9.1.1Powering Accessories
    2. 9.2Typical Application
      1. 9.2.1Design Requirements
      2. 9.2.2Detailed Design Procedure
        1. 9.2.2.1Selection of RBAT
        2. 9.2.2.2Selection of RCE, RFAULT, and RPU
        3. 9.2.2.3 Selection of Input and Output Bypass Capacitors
      3. 9.2.3Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1Layout Guidelines
    2. 11.2Layout Example
  12. 12Device and Documentation Support
    1. 12.1Community Resources
    2. 12.2Trademarks
    3. 12.3Electrostatic Discharge Caution
    4. 12.4Glossary
  13. 13Mechanical, Packaging, and 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
  • Maximum Input Voltage of 30 V
  • Supports up to 1.5-A Input Current
  • Robust Against False Triggering Due to Current Transients
  • Thermal Shutdown
  • Enable Input
  • Status Indication – Fault Condition
  • Available in Space-Saving Small 8 Lead 2 × 2 WSON

2 Applications

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

3 Description

The bq24314A device is a highly integrated circuit (IC) designed to provide protection to Li-ion batteries from failures of the charging circuit. The device continuously monitors the input voltage, the input current, and the battery voltage. In case of an input overvoltage condition, the device immediately removes power from the charging circuit by turning off an internal switch. In the case of an overcurrent condition, it limits the system current at the threshold value, and if the overcurrent persists, switches the pass element OFF after a blanking period. Additionally, the device also monitors its own die temperature and switches off if it exceeds 140°C. The input overcurrent threshold is user-programmable.

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

Device Information(1)

PART NUMBERPACKAGEBODY SIZE (NOM)
bq24314AWSON (8)2.00 mm × 2.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

4 Simplified Schematic

bq24314A typ_sch_lus811.gif