SNVS754O January   2000  – August 2026 LM78L

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  Thermal Information
    4. 5.4  Recommended Operating Conditions
    5. 5.5  Electrical Characteristics: LM78L33 (New Chip Only)
    6. 5.6  Electrical Characteristics: LM78L05 (Legacy and New Chip)
    7. 5.7  Electrical Characteristics: LM78L06 (New Chip Only)
    8. 5.8  Electrical Characteristics: LM78L09 (Legacy Chip Only)
    9. 5.9  Electrical Characteristics: LM78L12 (Legacy and New Chip)
    10. 5.10 Electrical Characteristics: LM78L15 (Legacy and New Chip)
    11. 5.11 Electrical Characteristics: LM78L62 (Legacy Chip Only)
    12. 5.12 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Load Regulation
      2. 6.3.2 Protection
      3. 6.3.3 Current Limit
    4. 6.4 Device Functional Modes
      1. 6.4.1 Normal Operation
      2. 6.4.2 Dropout Operation
      3. 6.4.3 Shutdown
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Applications
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Input Capacitor
        2. 7.2.2.2 Output Capacitor
        3. 7.2.2.3 Power Dissipation (PD)
        4. 7.2.2.4 Estimating Junction Temperature
        5. 7.2.2.5 Overload Recovery
        6. 7.2.2.6 Reverse Current
        7. 7.2.2.7 Polarity Reversal Protection
      3. 7.2.3 Application Curve
      4. 7.2.4 Other Application Circuits
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Evaluation Module
      2. 8.1.2 Device Nomenclature
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 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

7.2.2.7 Polarity Reversal Protection

In many applications, a voltage regulator powers a load that is not connected to ground, but instead, is connected to a voltage source of the opposite polarity (for example, operational amplifiers, level-shifting circuits, and so on). During start-up and short-circuit events, this connection can lead to polarity reversal of the regulator output and can damage the internal components of the regulator.

To avoid polarity reversal on the regulator output, use external protection to protect the device.

Figure 7-3 shows one approach for protecting the device.

LM78L Example Circuit for Polarity Reversal Protection Using a Schottky Diode Figure 7-3 Example Circuit for Polarity Reversal Protection Using a Schottky Diode