SLUSG05 March   2025 UC2843L-Q1 , UC2844L-Q1 , UC2845L-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison
  6. 5 Pin Configuration and Functions
  7. 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
  8. 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
  9. 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 (UC284xL-Q1) Design Procedure
      3. 8.2.3 Application Curves
      4. 8.2.4 Power Supply Recommendations
      5. 8.2.5 Layout
        1. 8.2.5.1 Layout Guidelines
        2. 8.2.5.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Device Nomenclature
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

3 Description

The UC284xL-Q1 control device is an automotive-grade pin-for-pin compatible improved version of the UC284xAQ/UC284xA-Q1 families. Providing the necessary features to control current-mode or switched-mode power supplies, this device provides improved features: higher VCC range at 36V, lower start-up current at 0.25mA, tighter operating current tolerance at 15mA max, and faster response on cycle-by-cycle current protection at 100ns. Output driver of UC284xL-Q1 is improved with shorter rise and fall time at 75ns max to reduce switching loss, and stronger driver capabilities with lower output low level farther from the FETs threshold voltage.

Package Information
PART NUMBER PACKAGE(1) PACKAGE SIZE(2)
UC284xL-Q1 D (SOIC, 8) 4.9mm × 6mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.
(2) The package size (length × width) is a nominal value and includes pins, where applicable.
UC2843L-Q1 UC2844L-Q1 UC2845L-Q1 Typical Automotive Application Typical Automotive Application