LM2672M-5.0 National Semiconductor, LM2672M-5.0 Datasheet

LM2672M-5.0

Manufacturer Part Number

LM2672M-5.0

Description

DC/DC Converter IC

Manufacturer

National Semiconductor

Datasheets

1.LM2672LDX-ADJ.pdf (26 pages)

2.LM2672M-5.0.pdf (26 pages)

3.LM2672N-12.pdf (22 pages)

Specifications of LM2672M-5.0

Input Voltage

40V

Output Current

Output Voltage

No. Of Pins

Mounting Type

Surface Mount

Voltage Regulator Type

Buck Switching

Supply Voltage Min

6.5V

Output Current Max

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LM2672M-5.0

Manufacturer:

Quantity:

4 000

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LM2672M-5.0

Manufacturer:

Quantity:

Company:

Meier Automation Equipment Co., Limited

Part Number:

LM2672M-5.0

Manufacturer:

NS/国半

Quantity:

20 000

Company:

H&T Electronics

Part Number:

LM2672M-5.0/NOPB

Quantity:

2 200

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LM2672

SIMPLE SWITCHER

Step-Down Voltage Regulator with Features

General Description

The LM2672 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 1A 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), fixed frequency oscillator, external shutdown,

soft-start, and frequency synchronization.

The LM2672 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 LM2672 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

12934

Power Converter High Efficiency 1A

To simplify the LM2672 buck regulator design procedure,

there exists computer design software, LM267X Made Sim-

ple version 6.0.

Features

■

Typical 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 1A 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

1293401

www.national.com

April 2007

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