LM2677 Regulator Datasheet

LM2677 Datasheet, PDF, Equivalent


Part Number

LM2677

Description

High Efficiency 5-A Step-Down Voltage Regulator

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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LM2677
SNVS077J – MAY 2004 – REVISED JUNE 2016
LM2677 SIMPLE SWITCHER® High Efficiency 5-A Step-Down Voltage Regulator with Sync
1 Features
1 Efficiency up to 92%
• Simple and Easy to Design Using Off-the-Shelf
External Components
• 100-mΩ DMOS Output Switch
• 3.3-V, 5-V, and 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
• External Sync Clock Capability (280 kHz to
400 kHz)
• 260-kHz Fixed Frequency Internal Oscillator
40°C to 125°C Operating Junction Temperature
Range
2 Applications
• Simple to Design, High Efficiency (> 90%) Step-
Down Switching Regulators
• Efficient System Preregulator for Linear Voltage
Regulators
• Battery Chargers
• Communications and Radio Equipment Regulator
With Synchronized Clock Frequency
3 Description
The LM2677 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 5-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. The switching clock frequency can be
provided by an internal fixed frequency oscillator
(260 kHz) or from an externally provided clock in the
range of 280 kHz to 400 kHz, which allows the use of
physically smaller-sized components. A family of
standard inductors for use with the LM2677 are
available from several manufacturers to greatly
simplify the design process. The external Sync clock
provides direct and precise control of the output ripple
frequency for consistent filtering or frequency
spectrum positioning.
The LM2677 series also has built-in thermal
shutdown, current-limiting, and an ON/OFF control
input that can power down the regulator to a low
50-μA quiescent-current standby condition. The
output voltage is ensured to a ±2% tolerance.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TO-263 (7)
10.16 mm × 8.69 mm
LM2677
TO-220 (7)
10.16 mm × 8.94 mm
VSON (14)
6.10 mm × 5.10 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application
Feedback
0.01 PF
Input
Voltage
8V to 40V
3 x 15 PF/50V
+++
VIN
0.47 PF
LM2677 - 5.0
Boost
1 k:
Switch
Ground Output
L
22 PH
6TQ045S
Output
Voltage
5V/5A
2 x 180 PF, 16V
Optional External
Sync Clock
(280 kHz to 400 kHz)
100 pF
1
Copyright © 2016, Texas Instruments Incorporated
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.

LM2677
LM2677
SNVS077J – MAY 2004 – REVISED JUNE 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 .................................................. 5
6.5 Electrical Characteristics – 3.3 V .............................. 5
6.6 Electrical Characteristics – 5 V ................................. 5
6.7 Electrical Characteristics – 12 V ............................... 6
6.8 Electrical Characteristics – 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 Application .................................................. 16
9 Power Supply Recommendations...................... 25
10 Layout................................................................... 25
10.1 Layout Guidelines ................................................. 25
10.2 Layout Example .................................................... 26
11 Device and Documentation Support ................. 27
11.1 Documentation Support ........................................ 27
11.2 Receiving Notification of Documentation Updates 27
11.3 Community Resources.......................................... 27
11.4 Trademarks ........................................................... 27
11.5 Electrostatic Discharge Caution ............................ 27
11.6 Glossary ................................................................ 27
12 Mechanical, Packaging, and Orderable
Information ........................................................... 27
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision I (June 2012) to Revision J
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
• Deleted Manufacturers' Contact Numbers tables................................................................................................................. 18
2 Submit Documentation Feedback
Product Folder Links: LM2677
Copyright © 2004–2016, Texas Instruments Incorporated


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM2677 SNVS077J – MAY 2004 – REVISED JUNE 2016 LM2677 SIMPLE SW ITCHER® High Efficiency 5-A Step-Down Voltage Regulator with Sync 1 Features •1 Efficiency up to 92% • Simple a nd Easy to Design Using Off-the-Shelf E xternal Components • 100-mΩ DMOS Out put Switch • 3.3-V, 5-V, and 12-V Fix ed Output and Adjustable (1.2 V to 37 V ) Versions • 50-μA Standby Current W hen Switched OFF • ±2% Maximum Outpu t Tolerance Over Full Line and Load Con ditions • Wide Input Voltage Range: 8 V to 40 V • External Sync Clock Capa bility (280 kHz to 400 kHz) • 260-kHz Fixed Frequency Internal Oscillator −40°C to 125°C Operating Junction Temperature Range 2 Applications • S imple to Design, High Efficiency (> 90% ) StepDown Switching Regulators • Eff icient System Preregulator for Linear V oltage Regulators • Battery Chargers • Communications and Radio Equipment Regulator With Synchronized Clock Frequency 3 Description The L.
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