SNVS113F December   1999  – May 2016 LM3411

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 Electrical Characteristics: 3.3-V Version
    6. 6.6 Electrical Characteristics: 5-V Version
    7. 6.7 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagrams
    3. 8.3 Feature Description
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1  LM3411 Typical Application
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Compensation
          2. 9.2.1.2.2 Test Circuit
        3. 9.2.1.3 Application Curves
      2. 9.2.2  Isolated 250-mA Flyback Switching Regulator
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
      3. 9.2.3  Isolated 1.5-A Flyback Switching Regulator
        1. 9.2.3.1 Design Requirements
        2. 9.2.3.2 Detailed Design Procedure
      4. 9.2.4  Precision 1-A Buck Regulator
        1. 9.2.4.1 Design Requirements
        2. 9.2.4.2 Detailed Design Procedure
      5. 9.2.5  Negative Input, Negative or Positive Output Flyback Regulator
        1. 9.2.5.1 Design Requirements
        2. 9.2.5.2 Detailed Design Procedure
      6. 9.2.6  Precision 5-V, 1-A Low Dropout Regulator
        1. 9.2.6.1 Design Requirements
        2. 9.2.6.2 Detailed Design Procedure
      7. 9.2.7  3.3-V, 0.5-A Low Dropout Regulator
        1. 9.2.7.1 Design Requirements
        2. 9.2.7.2 Detailed Design Procedure
      8. 9.2.8  Precision Positive Voltage Regulator With Accurate Current Limit
        1. 9.2.8.1 Design Requirements
        2. 9.2.8.2 Detailed Design Procedure
      9. 9.2.9  Precision Negative Voltage Regulator
        1. 9.2.9.1 Design Requirements
        2. 9.2.9.2 Detailed Design Procedure
      10. 9.2.10 4.7-V Power ON Detector With Hysteresis
        1. 9.2.10.1 Detailed Design Procedure
      11. 9.2.11 ±50-mV External Trim
        1. 9.2.11.1 Detailed Design Procedure
      12. 9.2.12 250-mA Shunt Regulator
        1. 9.2.12.1 Design Requirements
        2. 9.2.12.2 Detailed Design Procedure
      13. 9.2.13 Voltage Detector
        1. 9.2.13.1 Detailed Design Procedure
      14. 9.2.14 Overvoltage Crowbar
        1. 9.2.14.1 Detailed Design Procedure
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Community Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

1 Features

  • Fixed Voltages of 3.3 V and 5 V With Initial Tolerance of ±1% for Standard Grade and ±0.5% for A Grade
  • Custom Voltages Available (3 V to 17 V)
  • Wide Output Current Range (20 μA to 15 mA)
  • Low Temperature Coefficient
  • Available in 5-Pin SOT-23 Surface-Mount Package (Tape and Reel)

2 Applications

  • Secondary Controller for Isolated DC-DC PWM Switching Regulators Systems
  • Use With LDO Regulator for High-Precision, Fixed-Output Regulators
  • Precision Monitoring Applications
  • Use With Many Types of Regulators to Increase Precision and Improve Performance

3 Description

The LM3411 is a low-power fixed-voltage (3.3 V or
5 V) precision shunt regulator designed specifically for driving an optoisolator to provide feedback isolation in a switching regulator.

The LM3411 circuitry includes an internally compensated operational amplifier, a bandgap reference, NPN output transistor, and voltage setting resistors.

A trimmed precision bandgap reference with temperature drift curvature correction provides a ensured 1% precision over the operating temperature range (A grade version). The inverting input of the amplifier is externally accessible for loop frequency compensation when used as part of a larger servo system. The output is an open-emitter NPN transistor capable of driving up to 15 mA of load current.

Because of its small die size, the LM3411 has been made available in the subminiature 5-pin SOT-23 surface-mount package. This package is ideal for use in space-critical applications.

Although its main application is to provide a precision output voltage (no trimming required) and maintain very good regulation in isolated DC-DC converters, it can also be used with other types of voltage regulators or power semiconductors to provide a precision output voltage without precision resistors or trimming.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
LM3411 SOT-23 (5) 2.90 mm × 1.60 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application Schematic

LM3411 01198701.gif

LM3411 Functional Diagram

LM3411 01198702.gif