LM2675
www.ti.com
SNVS129E –MAY 2004–REVISED JUNE 2005
LM2675 SIMPLE SWITCHER
®
Power Converter High Efficiency 1A Step-Down Voltage
Regulator
Check for Samples: LM2675
1
FEATURES
DESCRIPTION
The LM2675 series of regulators are monolithic
234
• Efficiency up to 96%
integrated circuits built with a LMDMOS process.
• Available in 8-pin SOIC and PDIP Packages
These regulators provide all the active functions for a
and a 16-pin WSON Package
step-down (buck) switching regulator, capable of
• Computer Design Software LM267X Made
driving a 1A load current with excellent line and load
regulation. These devices are available in fixed output
Simple (version 6.0)
voltages of 3.3V, 5.0V, 12V, and an adjustable output
• Simple and Easy to Design with
version.
• Requires Only 5 External Components
Requiring a minimum number of external
• Uses Readily Available Standard Inductors
components, these regulators are simple to use and
• 3.3V, 5.0V, 12V, and Adjustable Output
include patented internal frequency compensation
Versions
(Patent Nos. 5,382,918 and 5,514,947) and a fixed
frequency oscillator.
• Adjustable Version Output Voltage Range:
1.21V to 37V
The LM2675 series operates at a switching frequency
• ±1.5% Max Output Voltage Tolerance Over of 260 kHz, thus allowing smaller sized filter
components than what would be needed with lower
Line and Load Conditions
frequency switching regulators. Because of its very
• Ensured 1A Output Load Current
high efficiency (>90%), the copper traces on the
• 0.25Ω DMOS Output Switch
printed circuit board are the only heat sinking needed.
• Wide Input Voltage Range: 8V to 40V
A family of standard inductors for use with the
• 260 kHz Fixed Frequency Internal Oscillator
LM2675 are available from several different
manufacturers. This feature greatly simplifies the
• TTL Shutdown Capability, Low Power Standby
design of switch-mode power supplies using these
Mode
advanced ICs. Also included in the datasheet are
• Thermal Shutdown and Current Limit
selector guides for diodes and capacitors designed to
Protection
work in switch-mode power supplies.
Other features include a ensured ±1.5% tolerance on
TYPICAL APPLICATIONS
output voltage within specified input voltages and
• Simple High Efficiency (>90%) Step-Down
output load conditions, and ±10% on the oscillator
(Buck) Regulator
frequency. External shutdown is included, featuring
typically 50 μA stand-by current. The output switch
• Efficient Pre-Regulator for Linear Regulators
includes current limiting, as well as thermal shutdown
• Positive-to-Negative Converter
for full protection under fault conditions.
To simplify the LM2675 buck regulator design
procedure, there exists computer design software,
LM267X Made Simple version 6.0.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2SIMPLE SWITCHER is a registered trademark of Texas Instruments.
3Windows is a registered trademark of Microsoft Corporation.
4All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2004–2005, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
