SNVS124D November 1999  – May 2016 LM2596

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Description (continued)
  6. Pin Configuration and Functions
  7. Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics - 3.3-V Version
    6. 7.6 Electrical Characteristics - 5-V Version
    7. 7.7 Electrical Characteristics - 12-V Version
    8. 7.8 Electrical Characteristics - Adjustable Voltage Version
    9. 7.9 Electrical Characteristics - All Output Voltage Versions
    10. 7.10Typical Characteristics
  8. Detailed Description
    1. 8.1Overview
    2. 8.2Functional Block Diagram
    3. 8.3Feature Description
      1. 8.3.1Delayed Start-Up
      2. 8.3.2Undervoltage Lockout
      3. 8.3.3Inverting Regulator
      4. 8.3.4Inverting Regulator Shutdown Methods
    4. 8.4Device Functional Modes
      1. 8.4.1Discontinuous Mode Operation
  9. Application and Implementation
    1. 9.1Application Information
      1. 9.1.1Input Capacitor (CIN)
      2. 9.1.2Feedforward Capacitor (CFF)
      3. 9.1.3Output Capacitor (COUT)
      4. 9.1.4Catch Diode
      5. 9.1.5Inductor Selection
      6. 9.1.6Output Voltage Ripple and Transients
      7. 9.1.7Open-Core Inductors
    2. 9.2Typical Applications
      1. 9.2.1LM2596 Fixed Output Series Buck Regulator
        1. 9.2.1.1Design Requirements
        2. 9.2.1.2Detailed Design Procedure
          1. 9.2.1.2.1Custom Design with WEBENCH Tools
          2. 9.2.1.2.2Inductor Selection (L1)
          3. 9.2.1.2.3Output Capacitor Selection (COUT)
          4. 9.2.1.2.4Catch Diode Selection (D1)
          5. 9.2.1.2.5Input Capacitor (CIN)
        3. 9.2.1.3Application Curves
      2. 9.2.2LM2596 Adjustable Output Series Buck Regulator
        1. 9.2.2.1Design Requirements
        2. 9.2.2.2Detailed Design Procedure
          1. 9.2.2.2.1Programming Output Voltage
          2. 9.2.2.2.2Inductor Selection (L1)
          3. 9.2.2.2.3Output Capacitor Selection (COUT)
          4. 9.2.2.2.4Feedforward Capacitor (CFF)
          5. 9.2.2.2.5Catch Diode Selection (D1)
          6. 9.2.2.2.6Input Capacitor (CIN)
        3. 9.2.2.3Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1Layout Guidelines
    2. 11.2Layout Examples
    3. 11.3Thermal Considerations
  12. 12Device and Documentation Support
    1. 12.1Custom Design with WEBENCH Tools
    2. 12.2Receiving Notification of Documentation Updates
    3. 12.3Community Resources
    4. 12.4Trademarks
    5. 12.5Electrostatic Discharge Caution
    6. 12.6Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • NDH|5
  • NEB|5
  • KTT|5
Orderable Information

1 Features

  • 3.3-V, 5-V, 12-V, and Adjustable Output Versions
  • Adjustable Version Output Voltage Range: 1.2-V to 37-V ± 4% Maximum Over Line and Load Conditions
  • Available in TO-220 and TO-263 Packages
  • 3-A Output Load Current
  • Input Voltage Range Up to 40 V
  • Requires Only 4 External Components
  • Excellent Line and Load Regulation Specifications
  • 150-kHz Fixed-Frequency Internal Oscillator
  • TTL Shutdown Capability
  • Low Power Standby Mode, IQ, Typically 80 μA
  • High Efficiency
  • Uses Readily Available Standard Inductors
  • Thermal Shutdown and Current-Limit Protection
  • Create a Custom Design Using the LM2596 with the WEBENCH Power Designer

2 Applications

  • Simple High-Efficiency Step-Down (Buck) Regulator
  • On-Card Switching Regulators
  • Positive to Negative Converter

3 Description

The LM2596 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 3-A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, and an adjustable output version.

Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation, and a fixed-frequency oscillator.

The LM2596 series operates at a switching frequency of 150 kHz, thus allowing smaller sized filter components than what would be required with lower frequency switching regulators. Available in a standard 7-pin TO-220 package with several different lead bend options, and a 7-pin TO-263 surface mount package.

Device Information(1)

PART NUMBERPACKAGEBODY SIZE (NOM)
LM2596TO-220 (7)14.986 mm × 10.16 mm
TO-263 (7)10.10 mm × 8.89 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application

LM2596 01258301.png
(Fixed Output Voltage Versions)