Datasheet
LM2595
www.ti.com
SNVS122B –MAY 1999–REVISED APRIL 2013
LM2595 SIMPLE SWITCHER
®
Power Converter 150 kHz 1A Step-Down Voltage Regulator
Check for Samples: LM2595
1
FEATURES
DESCRIPTION
The LM2595 series of regulators are monolithic
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• 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 1A 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 (Surface
version.
Mount) Packages
• Ensured 1A Output Load Current
Requiring a minimum number of external
components, these regulators are simple to use and
• Input Voltage Range Up to 40V
include internal frequency compensation†, and a
• Requires Only 4 External Components
fixed-frequency oscillator.
• Excellent Line and Load Regulation
The LM2595 series operates at a switching frequency
Specifications
of 150 kHz thus allowing smaller sized filter
• 150 kHz Fixed Frequency Internal Oscillator
components than what would be needed with lower
• TTL Shutdown Capability frequency switching regulators. Available in a
standard 5-lead TO-220 package with several
• Low Power Standby Mode, I
Q
Typically 85 μA
different lead bend options, and a 5-lead TO-263
• High Efficiency
surface mount package. Typically, for output voltages
• Uses Readily Available Standard Inductors
less than 12V, and ambient temperatures less than
50°C, no heat sink is required.
• Thermal Shutdown and Current Limit
Protection
A standard series of inductors are available from
several different manufacturers optimized for use with
APPLICATIONS
the LM2595 series. This feature greatly simplifies the
design of switch-mode power supplies.
• Simple High-Efficiency Step-Down (Buck)
Regulator
Other features include an ensured ±4% tolerance on
output voltage under specified input voltage and
• Efficient Pre-Regulator for Linear Regulators
output load conditions, and ±15% on the oscillator
• On-Card Switching Regulators
frequency. External shutdown is included, featuring
• Positive to Negative Converter
typically 85 μA stand-by 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.
† Patent Number 5,382,918.
Typical Application
(Fixed Output Voltage Versions)
Connection Diagrams
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2SIMPLE SWITCHER, Switchers Made Simple are registered trademarks 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.