LM2674N-5.0 National Semiconductor, LM2674N-5.0 Datasheet

LM2674N-5.0

Manufacturer Part Number

LM2674N-5.0

Description

DC/DC Converter IC

Manufacturer

National Semiconductor

Datasheets

1.LM2674LDX-5.0.pdf (26 pages)

2.LM2674N-5.0.pdf (22 pages)

Specifications of LM2674N-5.0

Input Voltage

40V

Output Current

500mA

Output Voltage

No. Of Pins

Mounting Type

Through Hole

Voltage Regulator Type

Switching

Output Current Max

500mA

Peak Reflow Compatible (260 C)

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

LM2674N-5.0

Manufacturer:

Quantity:

20 000

Current page: 1 of 22
Download datasheet (441Kb)

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 pro-

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

regulator, capable of driving a 500 mA load current with ex-

cellent 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 sink-

ing 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 .

Features

n Efficiency up to 96%

n Available in SO-8 and 8-pin DIP 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 0.25

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

conditions

Regulator

1.5% max output voltage tolerance over line and load

DMOS Output Switch

DS100041-1

90%) Step-Down (Buck)

September 1998

www.national.com

Related parts for LM2674N-5.0

Related keywords

LM2674N-5.0 datasheet
LM2674N-5.0 data sheet
LM2674N-5.0 pdf datasheet
LM2674N-5.0 component
LM2674N-5.0 part
LM2674N-5.0 distributor
LM2674N-5.0 RoHS
LM2674N-5.0 datasheet download