LM2576T-ADJ Datasheet, PDF (1/37 Pages) Texas Instruments – LM2576/LM2576HV Series SIMPLE SWITCHER® 3A Step-Down Voltage Regulator

LM2576, LM2576HV
www.ti.com
SNVS107C – JUNE 1999 – REVISED APRIL 2013
LM2576/LM2576HV Series SIMPLE SWITCHER^® 3A Step-Down Voltage Regulator
Check for Samples: LM2576, LM2576HV
FEATURES
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•23 3.3V, 5V, 12V, 15V, and Adjustable Output
Versions
• Adjustable Version Output Voltage
Range,1.23V to 37V (57V for HV Version) ±4%
Max Over Line and Load Conditions
• Specified 3A Output Current
• Wide Input Voltage Range, 40V Up to 60V for
HV Version
• Requires Only 4 External Components
• 52 kHz Fixed Frequency Internal Oscillator
• TTL Shutdown Capability, Low Power Standby
Mode
• High Efficiency
• Uses Readily Available Standard Inductors
• Thermal Shutdown and Current Limit
Protection
• P+ Product Enhancement Tested
APPLICATIONS
• Simple High-Efficiency Step-Down (Buck)
Regulator
• Efficient Pre-Regulator for Linear Regulators
• On-Card Switching Regulators
• Positive to Negative Converter (Buck-Boost)
DESCRIPTION
The LM2576 series of regulators are monolithic
integrated circuits that provide all the active functions
for a step-down (buck) switching regulator, capable of
driving 3A load with excellent line and load regulation.
These devices are available in fixed output voltages
of 3.3V, 5V, 12V, 15V, 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 LM2576 series offers a high-efficiency
replacement for popular three-terminal linear
regulators. It substantially reduces the size of the
heat sink, and in some cases no heat sink is
required.
A standard series of inductors optimized for use with
the LM2576 are available from several different
manufacturers. This feature greatly simplifies the
design of switch-mode power supplies.
Other features include a specified ±4% tolerance on
output voltage within specified input voltages and
output load conditions, and ±10% on the oscillator
frequency. External shutdown is included, featuring
50 μA (typical) standby current. The output switch
includes cycle-by-cycle current limiting, as well as
thermal shutdown for full protection under fault
conditions.
TYPICAL APPLICATION
(Fixed Output Voltage Versions)
Figure 1.
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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.
SIMPLE SWITCHER is a registered trademark of Texas Instruments.
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All other trademarks are the property of their respective owners.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 1999–2013, Texas Instruments Incorporated