LM2576 Regulator Datasheet

LM2576 Datasheet PDF, Equivalent


Part Number

LM2576

Description

3-A Step-Down Voltage Regulator

Manufacture

etcTI

Total Page 30 Pages
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LM2576, LM2576HV
SNVS107D – JUNE 1999 – REVISED MAY 2016
LM2576xx Series SIMPLE SWITCHER® 3-A Step-Down Voltage Regulator
1 Features
1 3.3-V, 5-V, 12-V, 15-V, and Adjustable Output
Versions
• Adjustable Version Output Voltage Range,1.23 V
to 37 V (57 V for HV Version) ±4% Maximum Over
Line and Load Conditions
• Specified 3-A Output Current
• Wide Input Voltage Range: 40 V Up to 60 V 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
• Create a Custom Design with WEBENCH Tools
• 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 (Buck-Boost)
3 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 3-A load with excellent line and load
regulation. These devices are available in fixed output
voltages of 3.3 V, 5 V, 12 V, 15 V, and an adjustable
output version.
Requiring a minimum number of external
components, these regulators are simple to use and
include fault protection 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 ±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.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM2576
LM2576HV
TO-220 (5)
10.16 mm × 8.51 mm
DDPAK/TO-263 (5) 10.16 mm × 8.42 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Fixed Output Voltage Version Typical Application Diagram
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.

LM2576
LM2576, LM2576HV
SNVS107D – JUNE 1999 – REVISED MAY 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ..................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics: 3.3 V ................................ 5
6.6 Electrical Characteristics: 5 V ................................... 5
6.7 Electrical Characteristics: 12 V ................................. 5
6.8 Electrical Characteristics: 15 V ................................. 6
6.9 Electrical Characteristics: Adjustable Output
Voltage ....................................................................... 6
6.10 Electrical Characteristics: All Output Voltage
Versions ..................................................................... 6
6.11 Typical Characteristics ............................................ 8
7 Detailed Description ............................................ 12
7.1 Overview ................................................................. 12
7.2 Functional Block Diagram ....................................... 12
7.3 Feature Description................................................. 12
7.4 Device Functional Modes........................................ 14
8 Application and Implementation ........................ 15
8.1 Application Information............................................ 15
8.2 Typical Applications ................................................ 19
9 Power Supply Recommendations...................... 24
10 Layout................................................................... 25
10.1 Layout Guidelines ................................................. 25
10.2 Layout Example .................................................... 26
10.3 Grounding ............................................................. 26
10.4 Heat Sink and Thermal Considerations ................ 26
11 Device and Documentation Support ................. 28
11.1 Custom Design with WEBENCH Tools................. 28
11.2 Receiving Notification of Documentation Updates 28
11.3 Device Support .................................................... 28
11.4 Documentation Support ........................................ 29
11.5 Related Links ........................................................ 29
11.6 Community Resources.......................................... 29
11.7 Trademarks ........................................................... 29
11.8 Electrostatic Discharge Caution ............................ 29
11.9 Glossary ................................................................ 30
12 Mechanical, Packaging, and Orderable
Information ........................................................... 30
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision C (April 2013) to Revision D
Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section. ................................................................................................. 1
• Moved the thermal resistance data from the Electrical Characteristics: All Output Voltage Versions table to the
Thermal Information table....................................................................................................................................................... 4
Changes from Revision B (April 2013) to Revision C
Page
• Changed layout of National Data Sheet to TI format ............................................................................................................. 3
2 Submit Documentation Feedback
Copyright © 1999–2016, Texas Instruments Incorporated
Product Folder Links: LM2576 LM2576HV


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity LM2576, LM2576HV SNVS107D – J UNE 1999 – REVISED MAY 2016 LM2576xx Series SIMPLE SWITCHER® 3-A Step-Down Voltage Regulator 1 Features •1 3.3- V, 5-V, 12-V, 15-V, and Adjustable Outp ut Versions • Adjustable Version Outp ut Voltage Range,1.23 V to 37 V (57 V f or HV Version) ±4% Maximum Over Line a nd Load Conditions • Specified 3-A Ou tput Current • Wide Input Voltage Ran ge: 40 V Up to 60 V for HV Version • Requires Only 4 External Components • 52-kHz Fixed-Frequency Internal Oscill ator • TTL-Shutdown Capability, Low-P ower Standby Mode • High Efficiency Uses Readily Available Standard Indu ctors • Create a Custom Design with W EBENCH Tools • Thermal Shutdown and C urrent Limit Protection 2 Applications • Simple High-Efficiency Step-Down (B uck) Regulator • Efficient Preregulat or for Linear Regulators • On-Card Sw itching Regulators • Positive-to-Negative Converter (Buck-Boost) 3 Description The LM2576 series.
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