SNOS641I October   1999  – July 2025 LM4041-N , LM4041-N-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
    1.     Pin Functions
    2.     Pin Functions: ADJ Pinouts
  6. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  Recommended Operating Conditions
    4. 5.4  Thermal Information
    5. 5.5  LM4041-N LM4041-N-Q1 1.2 Electrical Characteristics (Industrial Temperature Range)
    6. 5.6  LM4041-N LM4041-N-Q1 1.2 Electrical Characteristics (Industrial Temperature Range)
    7. 5.7  LM4041-N LM4041-N-Q1 1.2 Electrical Characteristics (Extended Temperature Range)
    8. 5.8  LM4041-N LM4041-N-Q1 ADJ (Adjustable) Electrical Characteristics (Industrial Temperature Range)
    9. 5.9  LM4041-N LM4041-N-Q1 ADJ (Adjustable) Electrical Characteristics (Extended Temperature Range)
    10. 5.10 Typical Characteristics
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Shunt Regulator
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curve
      2. 8.2.2 Adjustable Shunt Regulator
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detail Design Procedure
      3. 8.2.3 Bounded Amplifier
        1. 8.2.3.1 Design Requirements
        2. 8.2.3.2 Detail Design Procedure
        3. 8.2.3.3 Application Curve
      4. 8.2.4 Voltage Level Detector
        1. 8.2.4.1 Design Procedure
        2. 8.2.4.2 Detail Design Procedure
      5. 8.2.5 Precision Current Sink and Source
        1. 8.2.5.1 Design Requirements
        2. 8.2.5.2 Detailed Design Procedure
      6. 8.2.6 100mA Current Source
        1. 8.2.6.1 Design Requirements
        2. 8.2.6.2 Detailed Design Procedure
      7. 8.2.7 LM4041 in Clamp Circuits
        1. 8.2.7.1 Design Requirements
        2. 8.2.7.2 Detailed Design Procedure
      8. 8.2.8 Floating Current Detector
        1. 8.2.8.1 Design Requirement
        2. 8.2.8.2 Detailed Design Procedure
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Receiving Notification of Documentation Updates
    2. 9.2 Support Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

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

8.2.3.2 Detail Design Procedure

With amplifier rails of ±15V, the output can be bound to ±11.5V with the LM4041-NLM4041-N-Q1 adjustable set for 10V and two nominal diode voltage drops of 0.7V.

Equation 9. VOUTBOUND = 2 × VFWD + VZ
Equation 10. VOUTBOUND = 1.4V + 10V

Select RS = 15kΩ to keep LR low. Calculate LR to confirm RS selection.

Use Equation 11, but in this case, take the negative supply into account.

Equation 11. lR = (VIN – VOUT) /R
Equation 12. lR = (VIN+ – VIN – VOUT) / R = (30V – 10V) / (RS1 + RS2) = 20V / 30kΩ = 0.667mA

This is an acceptable value for lR that does not draw excessive current, but prevents the part from being starved for current.