SLUS920A July   2009  – July 2015

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  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 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  Battery Voltage Regulation
      2. 8.3.2  Battery Current Regulation
      3. 8.3.3  Input Adapter Current Regulation
      4. 8.3.4  Adapter Detect and Power Up
      5. 8.3.5  Enable and Disable Charging
      6. 8.3.6  System Power Selector
      7. 8.3.7  Battery Learn Cycles
      8. 8.3.8  Automatic Internal Soft-Start Charger Current
      9. 8.3.9  Converter Operation
      10. 8.3.10 Synchronous and Non-Synchronous Operation
      11. 8.3.11 High Accuracy IADAPT Using Current Sense Amplifier (CSA)
      12. 8.3.12 Input Overvoltage Protection (ACOV)
      13. 8.3.13 Input Undervoltage Lockout (UVLO)
      14. 8.3.14 AC Lowvoltage (ACLOWV)
      15. 8.3.15 Battery Overvoltage Protection
      16. 8.3.16 Battery Shorted (Battery Undervoltage) Protection
      17. 8.3.17 Charge Overcurrent Protection
      18. 8.3.18 Thermal Shutdown Protection
      19. 8.3.19 Adapter Detected Status Register (ACGOOD Pin)
    4. 8.4 Device Functional Modes
      1. 8.4.1 Input Overpower Protection (ACOP)
        1. 8.4.1.1 Conditions For ACOP Latch Off
  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 Input Capacitance Calculation
        2. 9.2.2.2 Inductor Selection
        3. 9.2.2.3 Input Capacitor
        4. 9.2.2.4 Output Capacitor
        5. 9.2.2.5 Power MOSFET Selection
      3. 9.2.3 Application Curve
  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

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

1 Features

  • NMOS-NMOS Synchronous Buck Converter with 300 kHz Frequency and >95% Efficiency
  • 30-ns Minimum Driver Dead-time and 99.5% Maximum Effective Duty Cycle
  • High-Accuracy Voltage and Current Regulation
    • ±0.5% Charge Voltage Accuracy
    • ±3% Charge Current Accuracy
    • ±3% Adapter Current Accuracy
    • ±2% Input Current Sense Amp Accuracy
  • Integration
    • Automatic System Power Selection From AC/DC Adapter or Battery
    • Internal Loop Compensation
    • Internal Soft Start
  • Safety
    • Programmable Input Overvoltage Protection (OVP)
    • Fast Dynamic Power Management (DPM)
    • Programmable Inrush Adapter Power (ACOP) and Overcurrent (ACOC) Limits
    • Reverse-Conduction Protection Input FET
  • Supports Two, Three, or Four Li+ Cells
  • 8 – 24 V AC/DC-Adapter Operating Range
  • Analog Inputs with Ratiometric Programming via Resistors or DAC/GPIO Host Control
    • Charge Voltage (4-4.512 V/cell)
    • Charge Current (up to 10 A, with 10-mΩ)
    • Adapter Current Limit (DPM)
  • Status and Monitoring Outputs
    • Adapter Present with Programmable Voltage Threshold
    • Current Drawn from Input Source
  • Battery Learn Cycle Control
  • Charge Enable
  • 28-pin, 5x5-mm VQFN package
  • Energy Star Low Iq
    • < 10 μA Off-State Battery Discharge Current
    • < 1.5 mA Off-State Input Quiescent Current

2 Applications

  • Notebook, Netbook and Ultra-Mobile Computers
  • Portable Data Capture Terminals
  • Portable Printers
  • Medical Diagnostics Equipment
  • Battery Bay Chargers
  • Battery Back-up Systems

3 Description

The bq24753A is a high-efficiency, synchronous battery charger with integrated compensation and system power selector logic, offering low component count for space-constrained Li-Ion and Li-Polymer battery charging applications. Ratiometric charge current and voltage programming allows for high regulation accuracies, and can be either hardwired with resistors or programmed by the system power-management microcontroller using a DAC or GPIOs.

The bq24753A charges two, three, or four series Li+ cells, supporting up to 10 A of charge current, and is available in a 28-pin, 5x5-mm thin VQFN package.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
bq24753A VQFN (28) 5.00 mm × 5.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Simplified Schematic

bq24753A bq24753A_Datasheet_drawings_slus920.gif

4 Revision History

Changes from * Revision (July 2009) to A 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 to the VREF pin description - Do not apply an external voltage source on this pin.Go
  • Added 4 Cell to Figure 14 internal text.Go
  • Changed the Functional Block DiagramGo
  • Deleted bullet - Regulators are at 80% of final voltageGo