SLUS891B February   2010  – November 2014 BQ24600

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 Handling Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Requirements
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Battery Voltage Regulation
      2. 7.3.2  Battery Current Regulation
      3. 7.3.3  Precharge
      4. 7.3.4  Charge Termination, Recharge, and Safety Timer
      5. 7.3.5  Power Up
      6. 7.3.6  Enable and Disable Charging
      7. 7.3.7  Automatic Internal Soft-Start Charger Current
      8. 7.3.8  Cycle-by-Cycle Charge Undercurrent Protection
      9. 7.3.9  Input Overvoltage Protection (ACOV)
      10. 7.3.10 Input Undervoltage Lock-Out (UVLO)
      11. 7.3.11 Battery Overvoltage Protection
      12. 7.3.12 Cycle-by-Cycle Charge Overcurrent Protection
      13. 7.3.13 Thermal Shutdown Protection
      14. 7.3.14 Temperature Qualification
      15. 7.3.15 Timer Fault Recovery
      16. 7.3.16 PG Output
      17. 7.3.17 CE (Charge Enable)
      18. 7.3.18 Inductor, Capacitor, and Sense Resistor Selection Guidelines
      19. 7.3.19 Charge Status Outputs
      20. 7.3.20 Battery Detection
        1. 7.3.20.1 Example
    4. 7.4 Device Functional Modes
      1. 7.4.1 Converter Operation
      2. 7.4.2 Synchronous and Non-Synchronous Operation
    5. 7.5 Application Information
    6. 7.6 Typical Application
      1. 7.6.1 Design Requirements
      2. 7.6.2 Detailed Design Procedure
        1. 7.6.2.1 Inductor Selection
        2. 7.6.2.2 Input Capacitor
        3. 7.6.2.3 Output Capacitor
        4. 7.6.2.4 Power MOSFET Selection
        5. 7.6.2.5 Input Filter Design
      3. 7.6.3 Application Curves
  8. 8 Power Supply Recommendations
  9. 9  Layout
    1. 9.1 Layout Guidelines
    2. 9.2 Layout Example
  10. 10Device and Documentation Support
    1. 10.1 Trademarks
    2. 10.2 Third-Party Products Disclaimer
    3. 10.3 Electrostatic Discharge Caution
    4. 10.4 Glossary
  11. 11Mechanical, Packaging, and Orderable Information

1 Features

  • 1.2-MHz NMOS-NMOS Synchronous Buck Converter
  • Stand-Alone Charger Support for Li-Ion or Li-Polymer
  • 5-V – 28-V VCC Input Voltage Range and Supports 1S-6S 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
  • Integration
    • Internal Loop Compensation
    • Internal Soft Start
  • Safety
    • Input Overvoltage Protection
    • Battery Thermistor Sense Hot/Cold Charge Suspend
    • Battery Detection
    • Built-In 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 Power Converter
  • 30-ns Driver Dead-Time and 99.5% Max. Effective Duty Cycle
  • 16-Pin 3.5-mm × 3.5-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

  • Portable Equipment Handle Terminals
  • Industrial and Medical Equipment
  • Power Tools Appliance
  • Mobile Internet Device, and Ultra-Mobile PC

3 Description

The bq24600 is a highly integrated Li-ion or Li-polymer switch-mode battery-charge controller. It offers a constant-frequency synchronous PWM controller with high-accuracy charge current and voltage regulation, charge preconditioning, termination, and charge status monitoring,

The bq24600 charges the battery in three phases: preconditioning, constant current, and constant voltage. Charge is terminated when the current reaches a minimum level. An internal charge timer provides a safety backup. The bq24600 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)
bq24600 VQFN (16) 3.50 mm x 3.50 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

Simplified Schematic

sch1_lus891.gif

4 Revision History

Changes from A Revision (October 2011) to B Revision

  • Changed Added Handling Rating table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Device and Documentation Go
  • Changed feature text From: "Supports 1-6 Battery Cells" To: "Supports 1S-6S Battery Cells"Go
  • Changed the Application list Go
  • Deleted the Table of Graphs from the Typical Characteristics section Go
  • Changed the Description of D3, D4 in Table 4 From: "LED diode, green, 2.1 V, 10 mΩ, Vishay-Dale, WSL2010R0100F" To:"LED diode, green, 2.1 V, 20 mA, LTST-C190GKT"Go

Changes from * Revision (February 2010) to A Revision

  • Changed descriptions of PH and BTST pins in Pin Description tableGo
  • Changed VHTF to VTCO in two places in Equation 5Go
  • Changed Equation 15Go