SLUS224F September   1994  – October 2017 UC1842A , UC1843A , UC1844A , UC1845A , UC2842A , UC2843A , UC2844A , UC2845A , UC3842A , UC3843A , UC3844A , UC3845A

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  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 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Pulse-by-Pulse Current Limiting
      2. 7.3.2 Current Sense Circuit
      3. 7.3.3 Error Amplifier Configuration
      4. 7.3.4 Undervoltage Lockout
      5. 7.3.5 Oscillator
    4. 7.4 Device Functional Modes
      1. 7.4.1 Normal Operation
      2. 7.4.2 Undervoltage Lockout (UVLO) Start-Up
      3. 7.4.3 UVLO Turnoff Mode
  8. Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Custom Design With WEBENCH® Tools
        2. 8.2.2.2 UC2842A Design Procedure
      3. 8.2.3 Application Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Development Support
        1. 11.1.1.1 Custom Design With WEBENCH® Tools
      2. 11.1.2 Device Nomenclature
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Related Links
    4. 11.4 Receiving Notification of Documentation Updates
    5. 11.5 Community Resources
    6. 11.6 Trademarks
    7. 11.7 Electrostatic Discharge Caution
    8. 11.8 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

Revision History

Changes from E Revision (October 2017) to F Revision

  • Added WEBENCH links in three places, Features, Application and Implementation and Device and Documentation Support.Go
  • Added copyright information to the Simplified Application Diagram Go
  • Changed operating free-air temperature of the UC284xA changed from 125°C to 85°C. Go
  • Changed operating free-air temperature of the UC384xA changed from -40°C to 0°C. Go
  • Changed operating free-air temperature of the UC384xA changed from 85°C to 70°C. Go
  • Changed the frequency (f) calculation to the correct equation.Go
  • Changed the COUT equation to the corrected equation. Go
  • Changed the LPM equation to the corrected equation.Go
  • Added GCO(f) definition and equation.Go
  • Changed the fRHPz equation to the corrected equation.Go

Changes from D Revision (July 2011) to E Revision

  • Added Applications section, Device Information table, Pin Configuration and Functions section, Specifications section, Detailed Description section, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information sectionGo
  • Deleted Ordering Information Table; see POA at the end of the datasheetGo

Changes from C Revision (August 2010) to D Revision

  • Changed Absolute Maximum ratings table with maximum negative voltage and GND pin notes.Go

Changes from B Revision (September 2009) to C Revision

  • Corrected ISINK voltage.Go