Features
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3.3V, 5V, 12V, and adjustable output versions |
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Adjustable version output voltage range, 1.2V to 37V ±4% max over line and load conditions |
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Available in TO-220 and TO-263 packages |
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Guaranteed 3A output load current |
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Input voltage range up to 40V |
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Requires only 4 external components |
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Excellent line and load regulation specifications |
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150 kHz fixed frequency internal oscillator |
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TTL shutdown capability |
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Low power standby mode, IQ typically 80 µA |
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High efficiency |
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Uses readily available standard inductors |
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Thermal shutdown and current limit protection |
General 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 3A load with excellent line and load regulation. More...
Applications
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Simple high-efficiency step-down (buck) regulator |
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On-card switching regulators |
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Positive to negative converter |
Package Availability, Models, Samples & Pricing
General 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 3A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, 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 needed with lower frequency switching regulators. Available in a standard 5-lead TO-220 package with several different lead bend options, and a 5-lead TO-263 surface mount package.
A standard series of inductors are available from several different manufacturers optimized for use with the LM2596 series. This feature greatly simplifies the design of switch-mode power supplies.
Other features include a guaranteed ±4% tolerance on output voltage under specified input voltage and output load conditions, and ±15% on the oscillator frequency. External shutdown is included, featuring typically 80 µA standby current. Self protection features include a two stage frequency reducing current limit for the output switch and an over temperature shutdown for complete protection under fault conditions.
Application Notes
| Title |
Size in Kbytes |
Date |
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| AN-1061: Application Note 1061 Power Conversion in Line-Powered Equipment |
188 Kbytes |
1-Oct-02 |
View Online |
Download |
Receive via Email |
AN-1061 (Japanese): Application Note 1061 Power Conversion in Line-Powered Equipment
 |
215 Kbytes |
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| AN-1081: Application Note 1081 A Low Cost, Low Parts-Count DC/DC Converter with Multiple Outputs |
74 Kbytes |
26-Sep-02 |
View Online |
Download |
Receive via Email |
| AN-1082: Application Note 1082 Adjust or Synchronize LM2586/88 Switching Frequency |
50 Kbytes |
18-Sep-02 |
View Online |
Download |
Receive via Email |
| AN-1118: Application Note 1118 Simple Regulator Provides ±12V from 5V Source |
51 Kbytes |
30-Sep-02 |
View Online |
Download |
Receive via Email |
| AN-1149: Application Note 1149 Layout Guidelines for Switching Power Supplies |
113 Kbytes |
26-Sep-02 |
View Online |
Download |
Receive via Email |
AN-1149 (Japanese): Application Note 1149 Layout Guidelines for Switching Power Supplies
|
90 Kbytes |
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| AN-1197: Application Note 1197 Selecting Inductors for Buck Converters |
371 Kbytes |
1-Oct-02 |
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AN-1197 (Japanese): Application Note 1197 Selecting Inductors for Buck Converters
|
304 Kbytes |
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| AN-1229: Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines |
229 Kbytes |
1-Oct-02 |
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AN-1229 (Japanese): Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines
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304 Kbytes |
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| AN-1246: Application Note 1246 Stresses in Wide Input DC-DC Converters |
272 Kbytes |
26-Sep-02 |
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AN-1246 (Japanese): Application Note 1246 Stresses in Wide Input DC-DC Converters
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224 Kbytes |
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| AN-556: Application Note 556 Introduction to Power Supplies |
159 Kbytes |
25-Sep-02 |
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AN-556 (Japanese): Application Note 556 Introduction to Power Supplies
|
171 Kbytes |
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Typical Application
click for larger image
Parametric Table expand
Parametric Table collapse
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Typical Performance
*click for larger image
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WEBENCH Live Simulation!
LM2596 WEBENCH® Custom
Design/Analyze/Build It/Test It |
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Also Recommended
| LM2676 |
Higher Switching Frequency, Smaller Package |
| LM2673 |
Higher Switching Freq. W/ Soft Start And Prog. Current Limit |
| LM2670 |
Higher Switching Freq. W/ Freq. Synchronization And Enable Pin |
| LM2599 |
LM2596 W/ Error Flag, Soft Start And Shutdown Pin |
| LM2678 |
Higher Current (5A) And Higher Switching Freq. |
| LM2650 |
3A Synchronous Step-Down Regulator | 
Additional Resources
Online Seminars
Design Tools (see below)
Application Notes (see below)
Block Diagram
click for larger image
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