SLUS894B January   2010  – July 2015

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 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  Battery Voltage Regulation
      2. 8.3.2  Battery Current Regulation
      3. 8.3.3  Precharge
      4. 8.3.4  Input Adapter Current Regulation
      5. 8.3.5  Charge Termination, Recharge, and Safety Timer
      6. 8.3.6  Power Up
      7. 8.3.7  Enable and Disable Charging
      8. 8.3.8  System Power Selector
      9. 8.3.9  Automatic Internal Soft-Start Charger Current
      10. 8.3.10 Converter Operation
      11. 8.3.11 Synchronous and Non-Synchronous Operation
      12. 8.3.12 Cycle-By-Cycle Charge Undercurrent Protection
      13. 8.3.13 Input Overvoltage Protection (ACOV)
      14. 8.3.14 Input Undervoltage Lockout (UVLO)
      15. 8.3.15 Battery Overvoltage Protection
      16. 8.3.16 Cycle-By-Cycle Charge Overcurrent Protection
      17. 8.3.17 Thermal Shutdown Protection
      18. 8.3.18 Temperature Qualification
      19. 8.3.19 Timer Fault Recovery
      20. 8.3.20 PG Output
      21. 8.3.21 CE (Charge Enable)
      22. 8.3.22 Charge Status Outputs
      23. 8.3.23 Battery Detection
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Inductor Selection
        2. 9.2.2.2 Input Capacitor
        3. 9.2.2.3 Output Capacitor
        4. 9.2.2.4 Power MOSFET Selection
        5. 9.2.2.5 Input Filter Design
        6. 9.2.2.6 Inductor, Capacitor, and Sense Resistor Selection Guidelines
        7. 9.2.2.7 Typical System Circuit Component List
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

1 Features

  • 300-kHz NMOS-NMOS Synchronous Buck Converter
  • Stand-Alone Charger Specifically for Lithium Phosphate
  • 5-V–28-V VCC Input Operating Range, Supports 1–7 Battery Cells
  • 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 (DPM)
  • Safety Protection
    • Input Overvoltage Protection
    • Battery Thermistor Sense Suspend Charge at Hot/Cold and Automatically ICHARGE/8 at Hot/Cold or Warm/Cool
    • 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 99.95% Max. 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

  • Power Tool and Portable Equipment
  • Personal Digital Assistants
  • Handheld Terminals
  • Industrial and Medical Equipment
  • Netbook, Mobile Internet Device, and Ultra-Mobile PC

3 Description

The bq24630 is a highly integrated lithium phosphate 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 bq24630 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 bq24630 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.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
bq24630 VQFN (24) 4.00 mm × 4.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Simplified Schematic

bq24630 drawing_slus894.gif

4 Revision History

Changes from A Revision (October 2011) to B 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
  • Added text, equations and illustrations from Inductor Selection to PCB LayoutGo

Changes from * Revision (January 2010) to A Revision