SNVS116E May   1998  – December 2014 LM3420

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 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 LM3420 Electrical Characteristics
    6. 6.6 LM3420A Electrical Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Parameter Measurement Information
    1. 7.1 Test Circuits
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Compensation
      2. 8.3.2 VREG External Voltage Trim
    4. 8.4 Device Functional Modes
      1. 8.4.1 Operation as Control Section
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application: Constant Current/Constant Voltage Li-Ion Battery Charger
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Compensation Capacitor
      3. 9.2.3 Application Curve
      4. 9.2.4 Other Application Circuits
        1. 9.2.4.1 Low Dropout Constant Current/Constant Voltage 2-Cell Charger
        2. 9.2.4.2 High-Efficiency Switching Regulator Constant Current/Constant Voltage 2-Cell Charger
        3. 9.2.4.3 Low Dropout Constant Current/Constant Voltage Li-Ion Battery Charger
        4. 9.2.4.4 High-Efficiency Switching Charger With High Side Current Sensing
        5. 9.2.4.5 Fast-Pulsed Constant Current 2-Cell Charger
        6. 9.2.4.6 MOSFET Low Dropout Charger
  10. 10Power Supply Recommendations
  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

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7 Parameter Measurement Information

7.1 Test Circuits

The test circuits shown in Figure 8, Figure 9 and Figure 10 can be used to measure and verify various LM3420 parameters. Test conditions are set by forcing the appropriate voltage at the VOUT Set test point and selecting the appropriate RL or IOUT as specified in LM3420 Electrical Characteristics. Use a DVM at the “measure” test points to read the data.

01235930.pngFigure 8. Circuit Used For Bode Plots
01235931.pngFigure 9. Circuit Used For Response Time
01235907.pngFigure 10. LM3420 Test Circuit