LM3674 DC-DC Converter Datasheet

LM3674 Datasheet, PDF, Equivalent


Part Number

LM3674

Description

600-mA Step-Down DC-DC Converter

Manufacture

etcTI

Total Page 27 Pages
Datasheet
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LM3674
SNVS405G – DECEMBER 2005 – REVISED APRIL 2015
LM3674 2-MHz, 600-mA Step-Down DC-DC Converter in SOT-23
1 Features
1 Input Voltage Range From 2.7 V to 5.5 V
• 600-mA Maximum Load Current
• Available in Fixed and Adjustable Output Voltages
Ranging From 1 V to 3.3 V
• Operates From a Single Li-Ion Cell Battery
• Internal Synchronous Rectification for High
Efficiency
• Internal Soft-Start
• 0.01-µA Typical Shutdown Current
• 2-MHz PWM Fixed Switching Frequency (typical)
• Current Overload Protection and Thermal
Shutdown Protection
2 Applications
• Mobile Phones
• PDAs
• MP3 Players
• Portable Instruments
• W-LAN
• Digital Still Cameras
• Portable Hard Disk Drives
3 Description
The LM3674 step-down DC-DC converter is
optimized for powering low-voltage circuits from a
single Li-Ion cell battery and input voltage rails from
2.7 V to 5.5 V. It provides up to 600-mA load current
over the entire input voltage range. There are several
fixed output voltages and adjustable output voltage
versions.
The device offers superior features and performance
for mobile phones and similar portable systems.
During the Pulse Width Modulation (PWM) mode, the
device operates at a fixed-frequency of 2 MHz
(typical). Internal synchronous rectification provides
high efficiency during the PWM mode operation. In
shutdown mode, the device turns off and reduces
battery consumption to 0.01 µA (typical).
The LM3674 is available in a 5-pin SOT-23 package.
A high switching frequency of 2 MHz (typical) allows
use of only three tiny external surface-mount
components, an inductor and two ceramic capacitors.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM3674
SOT-23 (5)
2.90 mm × 1.60 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Circuit
VIN
2.7V to 5.5V
CIN
4.7 2F
VIN
1
L1:2.2 2H
SW
5
LM3674
GND
2
EN
3
FB
4
VOUT
COUT
10 2F
Typical Application Circuit for Adjustable Voltage
Option
VIN
2.7V to 5.5V
CIN: 4.7 2F
VIN
1
L1: 2.2 2H
SW
5
LM3674-
GND ADJ
2
C1
EN
3
FB
4
R1
VOUT
COUT: 10 2F
C2 R2
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.

LM3674
LM3674
SNVS405G – DECEMBER 2005 – REVISED APRIL 2015
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 Dissipation Ratings ................................................... 4
6.6 Electrical Characteristics .......................................... 5
6.7 Typical Characteristics .............................................. 6
7 Detailed Description .............................................. 9
7.1 Overview ................................................................... 9
7.2 Functional Block Diagram ......................................... 9
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 ................................................ 12
9 Power Supply Recommendations...................... 17
10 Layout................................................................... 17
10.1 Layout Guidelines ................................................. 17
10.2 Layout Example .................................................... 18
11 Device and Documentation Support ................. 19
11.1 Device Support...................................................... 19
11.2 Trademarks ........................................................... 19
11.3 Electrostatic Discharge Caution ............................ 19
11.4 Glossary ................................................................ 19
12 Mechanical, Packaging, and Orderable
Information ........................................................... 19
4 Revision History
Changes from Revision F (May 2013) to Revision G
Page
• Added Pin Configuration and Functions section, 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 "in leaded (Pb) and lead-free (no Pb) versions" ....................................................................................................... 1
Changes from Revision E (April 2013) to Revision F
Page
• Changed layout of National Data Sheet to TI format ........................................................................................................... 18
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Product Folder Links: LM3674
Copyright © 2005–2015, Texas Instruments Incorporated


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community Reference Design LM3674 SNV S405G – DECEMBER 2005 – REVISED APR IL 2015 LM3674 2-MHz, 600-mA Step-Down DC-DC Converter in SOT-23 1 Features 1 Input Voltage Range From 2.7 V to 5 .5 V • 600-mA Maximum Load Current Available in Fixed and Adjustable Out put Voltages Ranging From 1 V to 3.3 V • Operates From a Single Li-Ion Cell Battery • Internal Synchronous Rectif ication for High Efficiency • Interna l Soft-Start • 0.01-µA Typical Shutd own Current • 2-MHz PWM Fixed Switchi ng Frequency (typical) • Current Over load Protection and Thermal Shutdown Pr otection 2 Applications • Mobile Phon es • PDAs • MP3 Players • Portabl e Instruments • W-LAN • Digital Sti ll Cameras • Portable Hard Disk Drive s 3 Description The LM3674 step-down D C-DC converter is optimized for powerin g low-voltage circuits from a single Li -Ion cell battery and input voltage rails from 2.7 V to 5.5 V. It provides up to 600-mA load current.
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