LM3673 DC-DC Converter Datasheet

LM3673 Datasheet, PDF, Equivalent


Part Number

LM3673

Description

350-mA Step-Down DC-DC Converter

Manufacture

etcTI

Total Page 28 Pages
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LM3673
SNVS434M – JULY 2006 – REVISED NOVEMBER 2016
LM3673 2-MHz, 350-mA Step-Down DC-DC Converter
1 Features
1 16-µA Typical Quiescent Current
• 350-mA Maximum Load Capability
• 2-MHz PWM Fixed Switching Frequency (Typical)
• Automatic PFM/PWM Mode Switching
• Available in Fixed and Adjustable Output Voltages
• Internal Synchronous Rectification for High
Efficiency
• Internal Soft Start
• 0.01-µA Typical Shutdown Current
• Operates From a Single Li-Ion Cell Battery
• Current Overload and Thermal Shutdown
Protection
• Only Three Tiny Surface-Mount External
Components Required (One Inductor, Two
Ceramic Capacitors)
2 Applications
• Mobile Phones
• PDAs
• MP3 Players
• W-LAN
• Portable Instruments
• Digital Still Cameras
• Portable Hard Disk Drives
3 Description
The LM3673 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 350-mA load current
over the entire input voltage range. There are several
different fixed voltage output options available, as
well as an adjustable output voltage version ranging
from 1.1 V to 3.3 V.
The device offers superior features and performance
for mobile phones and similar portable systems. The
LM3673 uses intelligent automatic switching between
pulse width modulation (PWM) and pulse frequency
modulation (PFM) for better efficiency. During PWM
mode, the device operates at a fixed-frequency of
2 MHz (typical). Hysteretic PFM mode extends the
battery life by reducing the quiescent current to 16 µA
(typical) during light load and standby operation.
Internal synchronous rectification provides high
efficiency during PWM mode operation. In shutdown
mode, the device turns off and reduces battery
consumption to 0.01 µA (typical).
The LM3673 is available in a tiny 5-pin DSBGA
package. A high switching frequency of 2 MHz
(typical) allows the use of three tiny surface-mount
components: an inductor and two ceramic capacitors.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (MAX)
LM3673
DSBGA (5)
1.413 mm × 1.083 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
VIN
2.7 V to 5.5 V
CIN
4.7 µF
Typical Application Circuit
VIN
1
L1: 2.2 µH
5 SW
LM3673
GND
2
EN 3
4 FB
VOUT
COUT
10 µF
Typical Application Circuit for ADJ Version
VIN
2.7 V to 5.5 V
CIN
4.7 µF
VIN
1
5
LM3673-
GND ADJ
2
L1: 2.2 µH
SW
C1
R1
VOUT
COUT
10 µF
EN 3
4 FB 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.

LM3673
LM3673
SNVS434M – JULY 2006 – REVISED NOVEMBER 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Voltage Options ..................................................... 3
6 Pin Configuration and Functions ......................... 3
7 Specifications......................................................... 4
7.1 Absolute Maximum Ratings ...................................... 4
7.2 ESD Ratings.............................................................. 4
7.3 Recommended Operating Ratings ........................... 4
7.4 Thermal Information .................................................. 4
7.5 Electrical Characteristics........................................... 5
7.6 Typical Characteristics .............................................. 6
8 Detailed Description .............................................. 9
8.1 Overview ................................................................... 9
8.2 Functional Block Diagram ......................................... 9
8.3 Feature Description................................................. 10
8.4 Device Functional Modes........................................ 11
9 Application and Implementation ........................ 13
9.1 Application Information............................................ 13
9.2 Typical Applications ................................................ 13
10 Power Supply Recommendations ..................... 19
11 Layout................................................................... 20
11.1 Layout Guidelines ................................................. 20
11.2 Layout Example .................................................... 21
11.3 DSBGA Package Assembly and Use ................... 21
12 Device and Documentation Support ................. 22
12.1 Device Support...................................................... 22
12.2 Documentation Support ........................................ 22
12.3 Receiving Notification of Documentation Updates 22
12.4 Community Resources.......................................... 22
12.5 Trademarks ........................................................... 22
12.6 Electrostatic Discharge Caution ............................ 22
12.7 Glossary ................................................................ 22
13 Mechanical, Packaging, and Orderable
Information ........................................................... 22
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision L (October 2015) to Revision M
Page
• Changed Figure 16 so that "Nfet on drains conductor..." says "Nfet on drains inductor..." ................................................. 12
Changes from Revision K (April 2013) to Revision L
Page
• Added Device Information and Pin Configuration and Functions sections, ESD Ratings table, Feature Description,
Device Functional Modes, Application and Implementation, Power Supply Recommendations, Layout, Device and
Documentation Support, and Mechanical, Packaging, and Orderable Information sections ................................................. 1
• Deleted Dissipation Ratings table - obsolete info................................................................................................................... 4
Changes from Revision J (April 2013) to Revision K
Page
• Changed layout of National Data Sheet to TI format ........................................................................................................... 20
2 Submit Documentation Feedback
Product Folder Links: LM3673
Copyright © 2006–2016, Texas Instruments Incorporated


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM3673 SNVS434M – JULY 200 6 – REVISED NOVEMBER 2016 LM3673 2-MH z, 350-mA Step-Down DC-DC Converter 1 Features •1 16-µA Typical Quiescent Current • 350-mA Maximum Load Capabil ity • 2-MHz PWM Fixed Switching Frequ ency (Typical) • Automatic PFM/PWM Mo de Switching • Available in Fixed and Adjustable Output Voltages • Interna l Synchronous Rectification for High Ef ficiency • Internal Soft Start • 0. 01-µA Typical Shutdown Current • Ope rates From a Single Li-Ion Cell Battery • Current Overload and Thermal Shutd own Protection • Only Three Tiny Surf ace-Mount External Components Required (One Inductor, Two Ceramic Capacitors) 2 Applications • Mobile Phones • PD As • MP3 Players • W-LAN • Portab le Instruments • Digital Still Camera s • Portable Hard Disk Drives 3 Desc ription The LM3673 step-down DC-DC conv erter is optimized for powering low voltage circuits from a single Li-Ion cell battery and input voltage .
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