Datasheet
Table Of Contents
- Features
- Applications
- Description
- Absolute Maximum Ratings
- Operating Conditions
- LM2596-3.3 Electrical Characteristics
- LM2596-5.0 Electrical Characteristics
- LM2596-12 Electrical Characteristics
- LM2596-ADJ Electrical Characteristics
- All Output Voltage Versions Electrical Characteristics
- Typical Performance Characteristics
- Test Circuit and Layout Guidelines
- Application Information
- EXTERNAL COMPONENTS
- FEEDFORWARD CAPACITOR (Adjustable Output Voltage Version)
- OUTPUT CAPACITOR
- CATCH DIODE
- INDUCTOR SELECTION
- DISCONTINUOUS MODE OPERATION
- OUTPUT VOLTAGE RIPPLE AND TRANSIENTS
- OPEN CORE INDUCTORS
- THERMAL CONSIDERATIONS
- DELAYED STARTUP
- UNDERVOLTAGE LOCKOUT
- INVERTING REGULATOR
- INVERTING REGULATOR SHUTDOWN METHODS
- Revision History
LM2596
www.ti.com
SNVS124C –NOVEMBER 1999–REVISED APRIL 2013
LM2596 SIMPLE SWITCHER
®
Power Converter 150 kHz
3A Step-Down Voltage Regulator
Check for Samples: LM2596
1
FEATURES
DESCRIPTION
The LM2596 series of regulators are monolithic
23
• 3.3V, 5V, 12V, and Adjustable Output Versions
integrated circuits that provide all the active functions
• Adjustable Version Output Voltage Range,
for a step-down (buck) switching regulator, capable of
1.2V to 37V ±4% Max Over Line and Load
driving a 3A load with excellent line and load
Conditions
regulation. These devices are available in fixed output
voltages of 3.3V, 5V, 12V, and an adjustable output
• Available in TO-220 and TO-263 Packages
version.
• Ensured 3A Output Load Current
Requiring a minimum number of external
• Input Voltage Range Up to 40V
components, these regulators are simple to use and
• Requires Only 4 External Components
include internal frequency compensation , and a
• Excellent Line and Load Regulation
fixed-frequency oscillator.
Specifications
The LM2596 series operates at a switching frequency
• 150 kHz Fixed Frequency Internal Oscillator
of 150 kHz thus allowing smaller sized filter
• TTL Shutdown Capability
components than what would be needed with lower
frequency switching regulators. Available in a
• Low Power Standby Mode, I
Q
Typically 80 μA
standard 5-lead TO-220 package with several
• High Efficiency
different lead bend options, and a 5-lead TO-263
• Uses Readily Available Standard Inductors
surface mount package.
• Thermal Shutdown and Current Limit
A standard series of inductors are available from
Protection
several different manufacturers optimized for use with
the LM2596 series. This feature greatly simplifies the
APPLICATIONS
design of switch-mode power supplies.
• Simple High-Efficiency Step-Down (Buck)
Other features include a ensured ±4% tolerance on
Regulator
output voltage under specified input voltage and
output load conditions, and ±15% on the oscillator
• On-Card Switching Regulators
frequency. External shutdown is included, featuring
• Positive to Negative Converter
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.
(1)
(1) † Patent Number 5,382,918.
Typical Application
(Fixed Output Voltage Versions)
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2SIMPLE SWITCHER is a registered trademark of Texas Instruments.
3All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 1999–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.