LM2672

更新时间： 2024-09-29 00:01:07

品牌	Logo	应用领域
美国国家半导体 - NSC		转换器稳压器
页数	文件大小	规格书
26页	870K
描述
SIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage Regulator with Features

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LM2672 数据手册

February 2005

LM2672

SIMPLE SWITCHER^®Power Converter High Efficiency

1A Step-Down Voltage Regulator with Features

To simplify the LM2672 buck regulator design procedure,

there exists computer design software, LM267X Made

Simple version 1.0.

General Description

The LM2672 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 1A load current with

excellent line and load regulation. These devices are avail-

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

adjustable output version.

Features

n Efficiency up to 96%

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

n Computer Design Software LM267X Made Simple

version 1.0

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.

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

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 cop-

per traces on the printed circuit board are the only heat

sinking needed.

1.5% max output voltage tolerance over line and load

conditions

n Guaranteed 1A 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 Soft-start and frequency synchronization

n Thermal shutdown and current limit protection

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.

Typical Applications

Other features include a guaranteed 1.5% tolerance on

output voltage within specified input voltages and output

load conditions, and 10% on the oscillator frequency. Ex-

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.

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

Regulator

n Efficient Pre-Regulator for Linear Regulators

Typical Application (Fixed Output Voltage

Versions)

01293401

SIMPLE SWITCHER^®is a registered trademark of National Semiconductor Corporation.

Windows^®is a registered trademark of Microsoft Corporation.

DS012934

www.national.com

12 3 4 5 6 7...26

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与LM2672相关器件

型号	品牌	获取价格	描述	数据表
LM2672_01	NSC	获取价格	SIMPLE SWITCHER㈢ Power Converter High Efficie
LM2672_07	NSC	获取价格	SIMPLE SWITCHER㈢ Power Converter High Efficie
LM2672EP	NSC	获取价格	Enhanced Plastic SIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage Regu
LM2672LD-12	TI	获取价格	Power Converter High Efficiency 1A Step-Down Voltage Regulator with Features
LM2672LD-12	NSC	获取价格	SIMPLE SWITCHER㈢ Power Converter High Efficie
LM2672LD-3.3	TI	获取价格	Power Converter High Efficiency 1A Step-Down Voltage Regulator with Features
LM2672LD-3.3	NSC	获取价格	SIMPLE SWITCHER㈢ Power Converter High Efficie
LM2672LD-3.3/NOPB	TI	获取价格	IC,SMPS CONTROLLER,VOLTAGE-MODE,BIPOLAR/MOS,LLCC,16PIN,PLASTIC
LM2672LD-5.0	NSC	获取价格	SIMPLE SWITCHER㈢ Power Converter High Efficie
LM2672LD-5.0	TI	获取价格	Power Converter High Efficiency 1A Step-Down Voltage Regulator with Features

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