LM2675

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SNVS129E – MAY 2004 – REVISED JUNE 2005

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

•

0.25

Ω 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.

2

SIMPLE SWITCHER is a registered trademark of Texas Instruments.

3

Windows is a registered trademark of Microsoft Corporation.

4

All 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.