LM3671-Q1 DC-DC Converter Datasheet

LM3671-Q1 Datasheet, PDF, Equivalent


Part Number

LM3671-Q1

Description

600-mA Step-Down DC-DC Converter

Manufacture

etcTI

Total Page 30 Pages
Datasheet
Download LM3671-Q1 Datasheet


LM3671-Q1
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LM3671, LM3671-Q1
SNVS294S – NOVEMBER 2004 – REVISED MAY 2016
LM3671/-Q1 2-MHz, 600-mA Step-Down DC-DC Converter
1 Features
1 LM3671-Q1 is Qualified for Automotive
Applications
• AEC Q100-Qualified With the Following Results
– Device Temperature Grade 1: –40°C to
+125°C Ambient Operating Temperature
Range
• 16-µA Typical Quiescent Current
• 600-mA Maximum Load Capability
• 2-MHz PWM Fixed Switching Frequency (Typical)
• Automatic PFM-PWM Mode Switching
• Internal Synchronous Rectification for High
Efficiency
• Internal Soft Start
• 0.01-µA Typical Shutdown Current
• Operates from a Single Li-Ion Cell Battery
• Only Three Tiny Surface-Mount External
Components Required (One Inductor, Two
Ceramic Capacitors)
• Current Overload and Thermal Shutdown
Protection
• Available in Fixed Output Voltages and Adjustable
Version
2 Applications
• Mobile Phones
• PDAs
• MP3 Players
• W-LAN
• Portable Instruments
• Digital Still Cameras
• Portable Hard Disk Drives
• Automotive
• Portable Medical Equipment
• Handheld Transaction Terminals
• Wireless Home-Automation Equipment
3 Description
The LM3671 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
different fixed voltage output options available as well
as an adjustable output voltage version range from
1.1 V to 3.3 V.
The device offers superior features and performance
for mobile phones and similar portable systems.
Automatic intelligent switching between PWM low-
noise and PFM low-current mode offers improved
system control. 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).
A high-switching frequency of 2 MHz (typical) allows
use of tiny surface-mount components. Only three
external surface-mount components, an inductor, and
two ceramic capacitors, are required.
Device Information(1)
PART NUMBER PACKAGE
BODY SIZE
LM3671
USON (6) 2.00 mm × 2.00 mm (NOM)
LM3671
LM3671-Q1
SOT-23 (5)
DSBGA (5)
2.90 mm × 1.60 mm (NOM)
1.413 mm × 1.083 mm (MAX)
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Typical Application Circuit: Fixed-Voltage
Typical Application Circuit: ADJ
VIN
2.7V to 5.5V
CIN
4.7 PF
VIN
1
5
LM3671
GND
2
L1: 2.2 PH
SW
EN
3
FB
4
VOUT
COUT
10 PF
VIN
2.7V to 5.5V
CIN
4.7 PF
VIN
GND
15
LM3671-
ADJ
2
L1: 2.2 PH
SW
C1
EN
3
FB
4
C2
VOUT
COUT
R1 10 PF
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.

LM3671-Q1
LM3671, LM3671-Q1
SNVS294S – NOVEMBER 2004 – REVISED MAY 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: LM3671 .............................................. 4
6.3 ESD Ratings: LM3671-Q1 ........................................ 4
6.4 Recommended Operating Conditions....................... 5
6.5 Thermal Information .................................................. 5
6.6 Dissipation Ratings ................................................... 5
6.7 Electrical Characteristics........................................... 6
6.8 Typical Characteristics .............................................. 7
7 Detailed Description ............................................ 12
7.1 Overview ................................................................. 12
7.2 Functional Block Diagram ....................................... 12
7.3 Feature Description................................................. 13
7.4 Device Functional Modes........................................ 13
8 Application and Implementation ........................ 16
8.1 Application Information............................................ 16
8.2 Typical Application .................................................. 16
9 Power Supply Recommendations...................... 20
10 Layout................................................................... 21
10.1 Layout Guidelines ................................................. 21
10.2 Layout Example .................................................... 22
10.3 DSBGA Package Assembly and Use ................... 22
11 Device and Documentation Support ................. 23
11.1 Device Support...................................................... 23
11.2 Documentation Support ........................................ 23
11.3 Related Links ........................................................ 23
11.4 Community Resources.......................................... 23
11.5 Trademarks ........................................................... 23
11.6 Electrostatic Discharge Caution ............................ 23
11.7 Glossary ................................................................ 23
12 Mechanical, Packaging, and Orderable
Information ........................................................... 24
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision R (November 2014) to Revision S
Page
• Added top nav icon for TI Design .......................................................................................................................................... 1
• Added several new "Applications" ......................................................................................................................................... 1
• moved storage temperature to Abs Max table ...................................................................................................................... 4
• Changed Handling Ratings to ESD Ratings .......................................................................................................................... 4
• Changed RθJA for USON from 165°C/W to 174.7°C/W; for SOT-23 from 130°C/W to 165.7°C/W, and for DSBGA
from 85°C/W to 181.0°C/W; added additional thermal values ............................................................................................... 5
• Changed RθJA values in Dissipation Ratings table ................................................................................................................. 5
Changes from Revision Q (November 2013) to Revision R
Page
• Added Device Information and Handling Rating tables, Feature Description, Device Functional Modes, Application
and Implementation, Power Supply Recommendations, Layout, Device and Documentation Support, and
Mechanical, Packaging, and Orderable Information sections; moved some curves to Application Curves section ............. 1
Changes from Revision O (April 2013) to Revision P
Page
• Changed layout of National Semiconductor Data Sheet to TI format .................................................................................. 22
2 Submit Documentation Feedback
Copyright © 2004–2016, Texas Instruments Incorporated
Product Folder Links: LM3671 LM3671-Q1


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community Reference Design LM3671, LM 3671-Q1 SNVS294S – NOVEMBER 2004 – REVISED MAY 2016 LM3671/-Q1 2-MHz, 600- mA Step-Down DC-DC Converter 1 Feature s •1 LM3671-Q1 is Qualified for Autom otive Applications • AEC Q100-Qualifi ed With the Following Results – Devic e Temperature Grade 1: –40°C to +125 °C Ambient Operating Temperature Range • 16-µA Typical Quiescent Current 600-mA Maximum Load Capability • 2 -MHz PWM Fixed Switching Frequency (Typ ical) • Automatic PFM-PWM Mode Switch ing • Internal Synchronous Rectificat ion for High Efficiency • Internal So ft Start • 0.01-µA Typical Shutdown Current • Operates from a Single Li-I on Cell Battery • Only Three Tiny Sur face-Mount External Components Required (One Inductor, Two Ceramic Capacitors) • Current Overload and Thermal Shutd own Protection • Available in Fixed O utput Voltages and Adjustable Version 2 Applications • Mobile Phones • PDAs • MP3 Players • W-LAN • P.
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