LM2671MX-5.0 National Semiconductor, LM2671MX-5.0 Datasheet

LM2671MX-5.0

Manufacturer Part Number

LM2671MX-5.0

Description

IC,SMPS CONTROLLER,VOLTAGE-MODE,BIPOLAR/MOS,SOP,8PIN,PLASTIC

Manufacturer

National Semiconductor

Datasheets

1.LM2671LDX-ADJ.pdf (24 pages)

2.LM2671N-ADJ.pdf (26 pages)

3.LM2671MX-5.0.pdf (26 pages)

Specifications of LM2671MX-5.0

Rohs Compliant

Available stocks

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Meier Automation Equipment Co., Limited

Part Number:

LM2671MX-5.0

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NS/国半

Quantity:

20 000

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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 (>90%), the copper

traces on the printed circuit board are the only heat sinking

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 ±1.5% tolerance on out-

put voltage within specified input voltages and output load

conditions, and ±10% on the oscillator frequency. External

shutdown is included, featuring typically 50 μA stand-by cur-

rent. The output switch includes current limiting, as well as

thermal shutdown for full protection under fault conditions.

Typical Application

(Fixed Output Voltage Versions)

SIMPLE SWITCHER

Windows

is a registered trademark of Microsoft Corporation.

is a registered trademark of National Semiconductor Corporation

100042

Power Converter High Efficiency

To simplify the LM2671 buck regulator design procedure,

there exists computer design software, LM267X Made Sim-

ple (version 6.0).

Features

■

Applications

■

Efficiency up to 96%

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

Computer Design Software LM267X Made Simple

(version 6.0)

Simple and easy to design with

Requires only 5 external components

Uses readily available standard inductors

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

Adjustable version output voltage range: 1.21V to 37V

±1.5% max output voltage tolerance over line and load

conditions

Guaranteed 500mA output load current

0.25Ω DMOS Output Switch

Wide input voltage range: 8V to 40V

260 kHz fixed frequency internal oscillator

TTL shutdown capability, low power standby mode

Soft-start and frequency synchronization

Thermal shutdown and current limit protection

Simple High Efficiency (>90%) Step-Down (Buck)

Regulator

Efficient Pre-Regulator for Linear Regulators

10004201

www.national.com

April 2007

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