LM2671N-ADJ National Semiconductor, LM2671N-ADJ Datasheet

LM2671N-ADJ

Manufacturer Part Number

LM2671N-ADJ

Description

Voltage Regulator IC

Manufacturer

National Semiconductor

Datasheets

1.LM2671LDX-ADJ.pdf (24 pages)

2.LM2671N-ADJ.pdf (26 pages)

3.LM2671N-ADJ.pdf (22 pages)

Specifications of LM2671N-ADJ

Output Current

500mA

No. Of Pins

Peak Reflow Compatible (260 C)

Leaded Process Compatible

Mounting Type

Through Hole

Package / Case

8 Lead

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

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LM2671

SIMPLE SWITCHER

500mA Step-Down Voltage Regulator with Features

General Description

The LM2671 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 500mA 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), fixed frequency oscillator, external shutdown,

soft-start, and frequency synchronization.

The LM2671 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 LM2671 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-

(Fixed Output Voltage Versions)

DS100042

1.5% tolerance on

90%), the cop-

Power Converter High Efficiency

DS100042-1

To simplify the LM2671 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 Soft-start and frequency synchronization

n Thermal shutdown and current limit protection

Typical Applications

n Simple High Efficiency (

n Efficient Pre-Regulator for Linear Regulators

conditions

Regulator

1.5% max output voltage tolerance over line and load

DMOS Output Switch

90%) Step-Down (Buck)

September 1998

www.national.com

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