Voltage Regulator. LM2676S-12 Datasheet

LM2676S-12 Regulator. Datasheet pdf. Equivalent

LM2676S-12 Datasheet
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Part LM2676S-12
Description High Efficiency 3-A Step-Down Voltage Regulator
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LM2676
SNVS031L – APRIL 2000 – REVISED JUNE 2020
LM2676 SIMPLE SWITCHER® High Efficiency 3-A Step-Down Voltage Regulator
1 Features
1 New product available: LMR33630 36-V, 3-A, 400-
kHz synchronous converter
• Efficiency up to 94%
• Simple and easy to design with (using off-the-shelf
external components)
• 150-mΩ DMOS output switch
• 3.3-V, 5-V, 12-V Fixed output and adjustable
(1.2 V to 37 V) versions
• 50-µA Standby current when switched OFF
• ±2% Maximum output tolerance over full line and
load conditions
• Wide input voltage range: 8 V to 40 V
• 260-KHz Fixed frequency internal oscillator
• –40 to 125°C Operating junction temperature
range
2 Applications
Communication module
Electricity meter
Calling button operating panel
Motor drives
3 Description
The LM2676 series of regulators are monolithic
integrated circuits which provide all of the active
functions for a step-down (buck) switching regulator
capable of driving up to 3-A loads with excellent line
and load regulation characteristics. High efficiency
(>90%) is obtained through the use of a low ON-
resistance DMOS power switch. The series consists
of fixed output voltages of 3.3-V, 5-V, and 12-V and
an adjustable output version.
The SIMPLE SWITCHER® concept provides for a
complete design using a minimum number of external
components. A high fixed frequency oscillator
(260 kHz) allows the use of physically smaller sized
components. A family of standard inductors for use
with the LM2676 are available from several
manufacturers to greatly simplify the design process.
The LM2676 series also has built-in thermal
shutdown, current limiting and an ON/OFF control
input that can power down the regulator to a low
50µA quiescent current standby condition. The
output voltage is ensured to a ±2% tolerance. The
clock frequency is controlled to within a ±11%
tolerance.
The new product, LMR33630, offers reduced BOM
cost, higher efficiency, and an 85% reduction in
solution size among many other features. See the
Device Comparison Table to compare specs. Start a
WEBENCH Design with LMR33630.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TO-263 (7)
10.10 mm × 8.89 mm
LM2676
TO-220 (7)
14.986 mm × 10.16 mm
VSON (14)
6.00 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application
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.



Texas Instruments LM2676S-12
LM2676
SNVS031L – APRIL 2000 – REVISED JUNE 2020
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 .................................................. 5
6.5 Electrical Characteristics: LM2676 – 3.3 V ............... 5
6.6 Electrical Characteristics: LM2676 – 5 V .................. 5
6.7 Electrical Characteristics: LM2676 – 12 B ................ 6
6.8 Electrical Characteristics: LM2676 – Adjustable....... 6
6.9 Electrical Characteristics – All Output Voltage
Versions ..................................................................... 6
6.10 Typical Characteristics ............................................ 7
7 Detailed Description ............................................ 10
7.1 Overview ................................................................. 10
7.2 Functional Block Diagram ....................................... 10
7.3 Feature Description................................................. 10
7.4 Device Functional Modes........................................ 11
8 Application and Implementation ........................ 12
8.1 Application Information............................................ 12
8.2 Typical Applications ................................................ 15
9 Power Supply Recommendations...................... 27
10 Layout................................................................... 27
10.1 Layout Guidelines ................................................. 27
10.2 Layout Example .................................................... 29
11 Device and Documentation Support ................. 30
11.1 Documentation Support ........................................ 30
11.2 Receiving Notification of Documentation Updates 30
11.3 Support Resources ............................................... 30
11.4 Trademarks ........................................................... 30
11.5 Electrostatic Discharge Caution ............................ 30
11.6 Glossary ................................................................ 30
12 Mechanical, Packaging, and Orderable
Information ........................................................... 30
12.1 DAP (VSON Package) .......................................... 30
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision K (June 2016) to Revision L
Page
• Added information about the LMR33630 ............................................................................................................................... 1
Changes from Revision J (April 2013) to Revision K
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
• Removed all references to Computer Design Software LM267X Made Simple (Version 6.0).............................................. 1
Changes from Revision I (April 2013) to Revision J
Page
• Changed layout of National Data Sheet to TI format ........................................................................................................... 26
2
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Texas Instruments LM2676S-12
www.ti.com
5 Pin Configuration and Functions
KTW Package
7-Pin TO-263
Top View
Not to scale
LM2676
SNVS031L – APRIL 2000 – REVISED JUNE 2020
Not to scale
NDZ Package
7-Pin TO-220
Top View
7
6
5
4
3
2
1
ON/OFF
FB
NC
GND
CB
Input
Switch_output
NHM Package
14-Pin VSON
Top View
NC 1
Input 2
Input 3
CB 4
NC 5
NC 6
FB 7
14
13
12
DAP 11
10
9
8
Switch_output
Switch_output
Switch_output
NC
NC
GND
ON/OFF
DAP connect to pin 9
Not to scale
NAME
Switch
output
Input
CB
GND
FB
ON/OFF
NC
Pin Functions
PIN
TO-263,
TO-220
VSON
I/O
DESCRIPTION
1
12, 13, 14
O
Source pin of the internal high-side FET. This is a switching node. Attached this pin to an
inductor and the cathode of the external diode.
Supply input pin to collector pin of high-side FET. Connect to power supply and input
2
2, 3
I bypass capacitors CIN. Path from VIN pin to high frequency bypass CIN and GND must be
as short as possible.
3
4
I
Boot-strap capacitor connection for high-side driver. Connect a high-quality 100-nF
capacitor from CB to VSW Pin.
4
9
Power ground pins. Connect to system ground. Ground pins of CIN and COUT. Path to CIN
must be as short as possible.
6
7
I
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.
7
8
I
Enable input to the voltage regulator. High = ON and low = OFF. Pull this pin high or float
to enable the regulator.
5
1, 5, 6, 10, 11 — No connect pins
Copyright © 2000–2020, Texas Instruments Incorporated
Product Folder Links: LM2676
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