SNVS754M January   2000  – February 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
    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

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7.2.4 Other Application Circuits

Figure 7-5 to Figure 7-9 show application circuit examples using the LM78Lxx devices. Customers must fully validate and test these circuits before implementing a design based on these examples.

LM78L Adjustable Output Regulator Circuit
VO = 5V + (5V / R1 + IQ) × R2*
* The 5V represents the fixed output voltage of the LM78L05. If using one of the other LM78Lxx devices, use that fixed output voltage value when calculating VO.
IQ < 5V / (3 × R1)
Load regulation (LR) of LM78L05 ≅ (R1 + R2) / R1
Figure 7-5 Adjustable Output Regulator Circuit
LM78L Current Regulator Circuit
IOUT = (VO / R1) + IQ
IQ = 1.5mA over line and load changes
Figure 7-6 Current Regulator Circuit
LM78L 5V, 500mA Regulator With Short-Circuit Protection Circuit
*Solid tantalum
**Heat sink Q1
***Optional: Improves ripple rejection and transient response.
Load Regulation = 0.6%, IL = 0mA to 250mA pulsed with tON = 50ms.
Figure 7-7 5V, 500mA Regulator With Short-Circuit Protection Circuit
LM78L ±15V, 100mA Dual Power Supply Circuit
*Solid tantalum
Figure 7-8 ±15V, 100mA Dual Power Supply Circuit
LM78L Variable Output Regulator Circuit (0.5V to 18V)
*Solid tantalum
VO = VG + 5V, R1 = (–VIN / IQ(LM78L05))
VO = 5V (R2 / R4) for (R2 + R3) = (R4 + R5)
A 0.5V output corresponds to (R2 / R4) = 0.1, (R3 / R4) = 0.9
Figure 7-9 Variable Output Regulator Circuit (0.5V to 18V)