LM3691 DC-DC Converter Datasheet

LM3691 Datasheet, PDF, Equivalent


Part Number

LM3691

Description

1-A Step-Down DC-DC Converter

Manufacture

etcTI

Total Page 29 Pages
Datasheet
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LM3691
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LM3691
SNVS506J – MAY 2008 – REVISED DECEMBER 2015
LM3691 High-Accuracy, Miniature 1-A Step-Down DC-DC Converter
for Portable Applications
1 Features
1 Input Voltage: 2.3 V to 5.5 V
• Output Voltage: 0.75 V to 3.3 V
• ±1% DC Output Voltage Precision
• 4-MHz Switching Frequency
• 64-μA (typical) Quiescent Current in ECO Mode
• 1-A Maximum Load Capability
• Automatic ECO/PWM Mode Switching
• MODE Pin to Select ECO/Forced PWM Mode
• Current Overload and Thermal Shutdown
Protections
• Only Three Tiny Surface-Mount External
Components Required (Solution Size Less Than
15 mm2)
2 Applications
• Mobile Phones
• Hand-Held Radios
• MP3 Players
• Portable Hard Disk Drives
Typical Application Circuit
VIN
2.3 V to 5.5 V
CIN
IN A2
B2
SW
EN A1 LM3691 C1 FB
VOUT
COUT
GND C2
B1 MODE
3 Description
The LM3691 step-down DC-DC converter is
optimized for powering ultra-low-voltage circuits from
a single Li-Ion cell or 3 cell NiMH/NiCd batteries. It
provides up to 1-A load current over an input voltage
range from 2.3 V to 5.5 V. There are several different
fixed voltage output options available.
The LM3691 has a mode-control pin that allows the
user to select Forced PWM mode or ECO mode that
changes modes between gated PWM mode and
PWM automatically, depending on the load. In ECO
mode, the device offers superior efficiency and very
low IQ under light load conditions. ECO mode extends
the battery life through reduction of the quiescent
current during light load conditions and system
standby.
The LM3691 is available in a 6-pin DSBGA package.
Only three external surface-mount components, a
1-μH inductor, a 4.7-μF input capacitor, and a 4.7-μF
output capacitor, are required.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (MAX)
LM3691
DSBGA (6)
1.59 mm × 1.295 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Efficiency vs. Output Current
(VOUT = 1.8 V, ECO Mode)
100
80
60 VIN = 2.3V
VIN = 3.6V
40
VIN = 4.2V
20
0
0.1 1 10 100 1000
OUTPUT CURRENT (mA)
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.

LM3691
LM3691
SNVS506J – MAY 2008 – REVISED DECEMBER 2015
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 ......................... 4
7 Specifications......................................................... 5
7.1 Absolute Maximum Ratings ...................................... 5
7.2 ESD Ratings.............................................................. 5
7.3 Recommended Operating Conditions....................... 5
7.4 Thermal Information .................................................. 5
7.5 Electrical Characteristics .......................................... 6
7.6 Typical Characteristics .............................................. 7
8 Detailed Description ............................................ 14
8.1 Overview ................................................................. 14
8.2 Functional Block Diagram ....................................... 14
8.3 Feature Description................................................. 15
8.4 Device Functional Modes........................................ 16
9 Application and Implementation ........................ 17
9.1 Application Information............................................ 17
9.2 Typical Application ................................................. 17
10 Power Supply Recommendations ..................... 20
11 Layout................................................................... 21
11.1 Layout Guidelines ................................................. 21
11.2 Layout Example .................................................... 22
11.3 DSBGA Package Assembly and Use ................... 22
12 Device and Documentation Support ................. 23
12.1 Device Support...................................................... 23
12.2 Documentation Support ........................................ 23
12.3 Community Resources.......................................... 23
12.4 Trademarks ........................................................... 23
12.5 Electrostatic Discharge Caution ............................ 23
12.6 Glossary ................................................................ 23
13 Mechanical, Packaging, and Orderable
Information ........................................................... 23
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision I (May 2013) to Revision J
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
Changes from Revision H (April 2013) to Revision I
Page
• Changed layout of National Data Sheet to TI format ........................................................................................................... 22
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Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM3691 SNVS506J – MAY 2008 – REVISED DECEMBER 2015 LM3691 High- Accuracy, Miniature 1-A Step-Down DC-DC Converter for Portable Applications 1 Features •1 Input Voltage: 2.3 V to 5.5 V • Output Voltage: 0.75 V to 3.3 V • ±1% DC Output Voltage Precision • 4-MHz Switching Frequency • 64- A (typical) Quiescent Current in ECO M ode • 1-A Maximum Load Capability • Automatic ECO/PWM Mode Switching • M ODE Pin to Select ECO/Forced PWM Mode Current Overload and Thermal Shutdow n Protections • Only Three Tiny Surfa ce-Mount External Components Required ( Solution Size Less Than 15 mm2) 2 Appli cations • Mobile Phones • Hand-Held Radios • MP3 Players • Portable Ha rd Disk Drives Typical Application Cir cuit VIN 2.3 V to 5.5 V CIN IN A2 B2 SW EN A1 LM3691 C1 FB VOUT COUT GND C2 B1 MODE 3 Description The LM3691 step-down DC-DC converter is optimized for powering ultra-low-voltage circuits from a single Li-I.
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