LM2674LD-12 NSC [National Semiconductor], LM2674LD-12 Datasheet

LM2674LD-12

Manufacturer Part Number

LM2674LD-12

Description

SIMPLE SWITCHER Power Converter High Efficiency 500 mA Step-Down Voltage Regulator

Manufacturer

NSC [National Semiconductor]

Datasheet

1.LM2674LD-12.pdf (26 pages)

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LM2674

SIMPLE SWITCHER

500 mA Step-Down Voltage Regulator

General Description

The LM2674 series of regulators are monolithic integrated

circuits built with a LMDMOS process. These regulators

provide all the active functions for a step-down (buck)

switching regulator, capable of driving a 500 mA load current

with excellent line and load regulation. These devices are

available in fixed output voltages of 3.3V, 5.0V, 12V, and an

adjustable output version.

Requiring a minimum number of external components, these

regulators are simple to use and include patented internal

frequency compensation (Patent Nos. 5,382,918 and

5,514,947) and a fixed frequency oscillator.

The LM2674 series operates at a switching frequency of

260 kHz, thus allowing smaller sized filter components than

what would be needed with lower frequency switching regu-

lators. Because of its very high efficiency (

per traces on the printed circuit board are the only heat

sinking needed.

A family of standard inductors for use with the LM2674 are

available from several different manufacturers. This feature

greatly simplifies the design of switch-mode power supplies

using these advanced ICs. Also included in the datasheet

are selector guides for diodes and capacitors designed to

work in switch-mode power supplies.

Other features include a guaranteed

output voltage within specified input voltages and output

load conditions, and

ternal shutdown is included, featuring typically 50 µA

stand-by current. The output switch includes current limiting,

as well as thermal shutdown for full protection under fault

conditions.

Typical Application

SIMPLE SWITCHER

Windows

is a registered trademark of Microsoft Corporation.

is a registered trademark of National Semiconductor Corporation.

10% on the oscillator frequency. Ex-

DS100041

1.5% tolerance on

90%), the cop-

Power Converter High Efficiency

To simplify the LM2674 buck regulator design procedure,

there exists computer design software, LM267X Made

Simple (version 6.0).

Features

n Efficiency up to 96%

n Available in SO-8, 8-pin DIP and LLP packages

n Computer Design Software LM267X Made Simple

n Simple and easy to design with

n Requires only 5 external components

n Uses readily available standard inductors

n 3.3V, 5.0V, 12V, and adjustable output versions

n Adjustable version output voltage range: 1.21V to 37V

n Guaranteed 500mA output load current

n 0.25Ω DMOS Output Switch

n Wide input voltage range: 8V to 40V

n 260 kHz fixed frequency internal oscillator

n TTL shutdown capability, low power standby mode

n Thermal shutdown and current limit protection

Typical Applications

n Simple High Efficiency (

n Efficient Pre-Regulator for Linear Regulators

n Positive-to-Negative Converter

(version 6.0)

conditions

Regulator

1.5% max output voltage tolerance over line and load

10004101

90%) Step-Down (Buck)

February 2005

www.national.com

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