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LM2595
SNVS122C – MAY 1999 – REVISED MAY 2016
LM2595 SIMPLE SWITCHER® Power Converter 150-kHz 1-A Step-Down Voltage Regulator
1 Features
•1 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 Surface-Mount Packages • Ensured 1-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 85 μA • High Efficiency • Uses Readily Available Standard Inductors • Thermal Shutdown and Current-Limit Protection
2 Applications
• Simple High-Efficiency Step-Down (Buck) Regulator
• Efficient Preregulator for Linear Regulators • On-Card Switching Regulators • Positive-to-Negative Converter
3 Description
The LM2595 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1-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 fixedfrequency oscillator.
The LM2595 series operates at a switching frequency of 150 kHz, thus allowing smaller-sized filter components than what would be needed with lowerfrequency switching regulators. Available in a standard 5-pin TO-220 package with several different lead bend options, and a 5-pin TO-263 surface-mount package. Typically, for output voltages less than 12 V, and ambient temperatures less than 50°C, no heat sink is required.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM2595
TO-263 (5) TO-220 (5)
10.16 mm × 8.42 mm 14.986 mm × 10.16 mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.
Typical Application
(Fixed Output Voltage Versions)
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA.
LM2595
SNVS122C – MAY 1999 – REVISED MAY 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1 2 Applications ........................................................... 1 3 Description ............................................................. 1 4 Revision History..................................................... 2 5 Description (continued)......................................... 3 6 Pin Configuration and Functions ......................... 3 7 Specifications......................................................... 4
7.1 Absolute Maximum Ratings ..................................... 4 7.2 ESD Ratings.............................................................. 4 7.3 Recommended Operating Conditions....................... 4 7.4 Thermal Information .................................................. 4 7.5 Electrical Characteristics – 3.3 V .............................. 5 7.6 Electrical Characteristics – 5 V ................................. 5 7.7 Electrical Characteristics – 12 V ............................... 5 7.8 Electrical Characteristics – Adjustable...................... 6 7.9 Electrical Characteristics – All Output Voltage
Versions ..................................................................... 6 7.10 Typical Characteristics ............................................ 7 8 Detailed Description ............................................ 10
8.1 Overview ................................................................. 10 8.2 Functional Block Diagram ....................................... 10 8.3 Feature Description................................................. 10 8.4 Device Functional Modes........................................ 14 9 Application and Implementation ........................ 15 9.1 Application Information............................................ 15 9.2 Typical Applications ................................................ 23 10 Power Supply Recommendations ..................... 31 11 Layout................................................................... 31 11.1 Layout Guidelines ................................................. 31 11.2 Layout Examples................................................... 31 11.3 Thermal Considerations ........................................ 32 12 Device and Documentation Support ................. 34 12.1 Community Resources.......................................... 34 12.2 Trademarks ............................................................