SNVSAX6 June   2017 LM78M05-MIL

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 Recommended Operating Conditions
    3. 6.3 Thermal Information
    4. 6.4 Electrical Characteristics
    5. 6.5 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
    4. 7.4 Device Functional Modes
      1. 7.4.1 Normal Operation
      2. 7.4.2 Operation With Low Input Voltage
      3. 7.4.3 Operation in Self Protection
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Input Voltage
        2. 8.2.2.2 Output Current
        3. 8.2.2.3 Input Capacitor
        4. 8.2.2.4 Output Capacitor
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Thermal Considerations
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

8.1 Application Information

The LM78M05-MIL device is a fixed voltage regulator that needs no external feedback resistors in order to set the output voltage. Input. Output capacitors are not required for the device to be stable. However, input capacitance helps filter noise from the supply and output capacitance improves the transient response.

8.2 Typical Application

LM78M05-MIL typ_app_snvsax6.gif
CIN required if regulator input is more than 4 inches from input filter capacitor (or if no input filter capacitor is used).
COUT is optional for improved transient response.
Figure 11. Typical Application

8.2.1 Design Requirements

For this design example, use the parameters listed in Table 1 as the input parameters.

Table 1. Design Parameters

PARAMETER VALUE
CIN 0.33 µF
COUT 0.1 µF

8.2.2 Detailed Design Procedure

8.2.2.1 Input Voltage

Regardless of the output voltage option being used (5 V, 12 V, 15 V), the input voltage must be at least 2 V greater to ensure proper regulation (7 V, 14 V, 17 V).

8.2.2.2 Output Current

Depending on the input-output voltage differential, the output current must be limited to ensure maximum power dissipation is not exceeded. The graph in Figure 1 shows the appropriate current limit for a variety of conditions.

8.2.2.3 Input Capacitor

If no power supply filter capacitor is used or if the device is placed more than four inches away from the capacitor of the power supply, an additional capacitor placed at the input pin of the device helps bypass noise.

8.2.2.4 Output Capacitor

This device is designed to be stable with no output capacitance and can be omitted from the design if needed. However if large changes in load are expected, an output capacitor is recommended to improve the transient response.

8.2.3 Application Curves

LM78M05-MIL 1048420.png Figure 12. RθJA vs 2-oz Copper Area for PFM
LM78M05-MIL 1048421.png Figure 14. Maximum Allowable Power Dissipation vs 2-oz Copper Area for PFM
LM78M05-MIL 1048422.png Figure 13. Maximum Allowable Power Dissipation
vs Ambient Temperature for PFM