SNVS754L January   2000  – June 2020 LM78L

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
    1.     Package Options
  3. 3 Description
    1.     Fixed Output Regulator Circuit
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information
    5. 7.5  Electrical Characteristics — LM78L05
    6. 7.6  Electrical Characteristics — LM78L09
    7. 7.7  Electrical Characteristics — LM78L12
    8. 7.8  Electrical Characteristics — LM78L15
    9. 7.9  Electrical Characteristics — LM78L62
    10. 7.10 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Load Regulation
      2. 8.3.2 Protection
    4. 8.4 Device Functional Modes
      1. 8.4.1 Normal Operation
      2. 8.4.2 Shutdown
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Fixed Output Regulator
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Input Capacitor
          2. 9.2.1.2.2 Output Capacitor
        3. 9.2.1.3 Application Curve
      2. 9.2.2 Other Application Circuits
  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 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

9.2.2 Other Application Circuits

Figure 10 to Figure 14 show application circuit examples using the LM78Lxx devices. Customers must fully validate and test these circuits before implementing a design based on these examples. Unless otherwise noted, the design procedures in Fixed Output Regulator are applicable to these designs.

LM78L 774409.png
VO = 5 V + (5 V / R1 + IQ) × R2*
* The 5 V 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 < 5 V / (3 × R1)
Load regulation (LR) of LM78L05 ≈ (R1 + R2) / R1
Figure 10. Adjustable Output Regulator Circuit
LM78L 774410.png
IOUT = (VO / R1) + IQ
IQ = 1.5 mA over line and load changes
Figure 11. Current Regulator Circuit
LM78L 774411.png
*Solid tantalum
**Heat sink Q1
***Optional: Improves ripple rejection and transient response.
Load Regulation = 0.6%, IL = 0 mA to 250 mA pulsed with tON = 50 ms.
Figure 12. 5-V, 500-mA Regulator With Short-Circuit Protection Circuit
LM78L 774412.png
*Solid tantalum
Figure 13. ±15-V, 100-mA Dual Power Supply Circuit
LM78L 774413.png
*Solid tantalum
VO = VG + 5 V, R1 = (–VIN / IQ(LM78L05))
VO = 5 V (R2 / R4) for (R2 + R3) = (R4 + R5)
A 0.5-V output will correspond to (R2 / R4) = 0.1, (R3 / R4) = 0.9
Figure 14. Variable Output Regulator Circuit (0.5 V to 18 V)