SLCS146G February   2005  – July 2024

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 Functional Block Diagram
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 Recommended Operating Conditions
    3. 6.3 LM4041x12I Electrical Characteristics
    4. 6.4 LM4041x12I Electrical Characteristics
    5. 6.5 LM4041x12Q Electrical Characteristics
    6. 6.6 LM4041xI (Adjustable Version) Electrical Characteristics
    7. 6.7 LM4041xI (Adjustable Version) Electrical Characteristics
    8. 6.8 LM4041xQ (Adjustable Version) Electrical Characteristics
    9. 6.9 Typical Characteristics
  8. 7 Application Information
    1. 7.1 Output Capacitor
    2. 7.2 SOT-23 and SC-70 Pin Connections
    3. 7.3 Adjustable Version
    4. 7.4 Cathode and Load Currents
  9. 8 Device and Documentation Support
    1. 8.1 Receiving Notification of Documentation Updates
    2. 8.2 Trademarks
    3. 8.3 Electrostatic Discharge Caution
    4. 8.4 Support Resources
    5. 8.5 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

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

7.4 Cathode and Load Currents

In a typical shunt regulator configuration (see Figure 7-4), an external resistor, RS, is connected between the supply and the cathode of the LM4041. RS must be set properly, this sets the total current available to supply the load (IL) and bias the LM4041 (IZ). In all cases, IZ must stay within a specified range for proper operation of the reference. Taking into consideration one extreme in the variation of the load and supply voltage (maximum IL and minimum VS), RS must be small enough to supply the minimum IZ required for operation of the regulator, as given by data sheet parameters. At the other extreme, maximum VS and minimum IL, RS must be large enough to limit IZ to less than the maximum recommended rating of 12mA.

RS is calculated as shown in Equation 1.

Equation 1. LM4041
LM4041 Shunt RegulatorFigure 7-4 Shunt Regulator