Voltage Regulator. LM2576S-12 Datasheet

LM2576S-12 Regulator. Datasheet pdf. Equivalent

LM2576S-12 Datasheet
Recommendation LM2576S-12 Datasheet
Part LM2576S-12
Description 3-A Step-Down Voltage Regulator
Feature LM2576S-12; LM2576, LM2576HV SNVS107F – JUNE 1999 – REVISED MAY 2021 LM2576xx Series SIMPLE SWITCHER® 3-A Step-D.
Manufacture etcTI
Datasheet
Download LM2576S-12 Datasheet





Texas Instruments LM2576S-12
LM2576, LM2576HV
SNVS107F – JUNE 1999 – REVISED MAY 2021
LM2576xx Series SIMPLE SWITCHER® 3-A Step-Down Voltage Regulator
1 Features
• Newer products available:
LMR33630 36-V, 3-A, 400-kHz synchronous
converter
LM76003 60-V, 3.5-A, 2.2-MHz synchronous
converter
• 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 four 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 using the LMR33630 or
LM76003 with the WEBENCH® Power Designer
2 Applications
Motor drives
Merchant network and server PSU
Appliances
Test and measurement equipment
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.
The new product, LMR33630, offers reduced BOM
cost, higher efficiency, and an 85% reduction in
solution size among many other features. The
LM76003 requires very few external components and
has a pinout designed for simple, optimum PCB
layout for EMI and thermal performance. See the
device comparison table to compare specs.
Device Information
PART NUMBER(1)
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
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.



Texas Instruments LM2576S-12
LM2576, LM2576HV
SNVS107F – JUNE 1999 – REVISED MAY 2021
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................................25
10 Layout...........................................................................26
10.1 Layout Guidelines................................................... 26
10.2 Layout Example...................................................... 27
10.3 Grounding............................................................... 27
10.4 Heat Sink and Thermal Considerations.................. 27
11 Device and Documentation Support..........................29
11.1 Device Support........................................................29
11.2 Documentation Support.......................................... 30
11.3 Support Resources................................................. 30
11.4 Receiving Notification of Documentation Updates.. 30
11.5 Trademarks............................................................. 30
11.6 Electrostatic Discharge Caution.............................. 30
11.7 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 E (June 2020) to Revision F (May 2021)
Page
• Added information for the LM76003 promotion.................................................................................................. 1
• Updated the numbering format for tables, figures, and cross-references throughout the document. ................1
Changes from Revision D (January 2016) to Revision E (June 2020)
Page
• Added information about the LMR33630............................................................................................................ 1
Changes from Revision C (April 2013) to Revision D (January 2016)
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 (April 2013)
Page
• Changed layout of National Data Sheet to TI format.......................................................................................... 3
2
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Copyright © 2021 Texas Instruments Incorporated



Texas Instruments LM2576S-12
www.ti.com
5 Pin Configuration and Functions
LM2576, LM2576HV
SNVS107F – JUNE 1999 – REVISED MAY 2021
Figure 5-1. KC Package 5-Pin TO-220 Top View
Figure 5-2. KTT Package 5-PIN DDPAK/TO-263 Top
View
Figure 5-3. DDPAK/TO-263 (S) Package 5-Lead
Surface-Mount Package Top View
PIN
NO.
NAME
1
VIN
2
OUTPUT
3
GROUND
4
FEEDBACK
5
ON/OFF
TAB
(1) I = INPUT, O = OUTPUT
I/O(1)
I
O
I
I
Table 5-1. Pin Functions
DESCRIPTION
Supply input pin to collector pin of high-side transistor. Connect to power supply and input
bypass capacitors CIN. Path from VIN pin to high frequency bypass CIN and GND must be as
short as possible.
Emitter pin of the power transistor. This is a switching node. Attached this pin to an inductor
and the cathode of the external diode.
Ground pin. Path to CIN must be as short as possible.
Feedback sense input pin. Connect to the midpoint of feedback divider to set VOUT for ADJ
version or connect this pin directly to the output capacitor for a fixed output version.
Enable input to the voltage regulator. High = OFF and low = ON. Connect to GND to enable
the voltage regulator. Do not leave this pin float.
Connected to GND. Attached to heatsink for thermal relief for TO-220 package or put a
copper plane connected to this pin as a thermal relief for DDPAK package.
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Product Folder Links: LM2576 LM2576HV
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