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LM2671M-ADJ

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
27页	945K
描述
SIMPLE SWITCHER Power Converter High Efficiency 500mA Step-Down Voltage Regulator with Features

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LM2671M-ADJ 数据手册

February 2005

LM2671

SIMPLE SWITCHER^®Power Converter High Efficiency

500mA Step-Down Voltage Regulator with Features

To simplify the LM2671 buck regulator design procedure,

there exists computer design software, LM267X Made

Simple (version 6.0).

General Description

The LM2671 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 500mA 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.

Features

n Efficiency up to 96%

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

n Computer Design Software LM267X Made Simple

(version 6.0)

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 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 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 500mA 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 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.

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)

10004201

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

Windows^®is a registered trademark of Microsoft Corporation.

DS100042

www.national.com

12 3 4 5 6 7...27

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LM2671M-ADJ 替代型号

型号	品牌	替代类型	描述	数据表
LM2674M-ADJ/NOPB	TI	功能相似	LM2674 SIMPLE SWITCHERÂ® Power Converter High
LM2674MX-5.0/NOPB	TI	功能相似	LM2674 SIMPLE SWITCHERÂ® Power Converter High
LM2594MX-5.0/NOPB	TI	功能相似	LM2594/LM2594HV SIMPLE SWITCHERÂ® Power Conve

与LM2671M-ADJ相关器件

型号	品牌	获取价格	描述	数据表
LM2671M-ADJ/NOPB	TI	获取价格	LM2671 SIMPLE SWITCHER Power Converter High Efficiency 500mA Step-Down Voltage Regulator
LM2671MX-12	TI	获取价格	LM2671 SIMPLE SWITCHER Power Converter High Efficiency 500mA Step-Down Voltage
LM2671MX-12	NSC	获取价格	SIMPLE SWITCHER Power Converter High Efficiency 500mA Step-Down Voltage Regulator with Fea
LM2671MX-12/NOPB	TI	获取价格	LM2671 SIMPLE SWITCHER Power Converter High Efficiency 500mA Step-Down Voltage Regulator
LM2671MX-3.3	TI	获取价格	LM2671 SIMPLE SWITCHER Power Converter High Efficiency 500mA Step-Down Voltage
LM2671MX-3.3	NSC	获取价格	SIMPLE SWITCHER Power Converter High Efficiency 500mA Step-Down Voltage Regulator with Fea
LM2671MX-3.3/NOPB	TI	获取价格	LM2671 SIMPLE SWITCHER Power Converter High Efficiency 500mA Step-Down Voltage Regulator
LM2671MX-33	TI	获取价格	LM2671 SIMPLE SWITCHER Power Converter High Efficiency 500mA Step-Down Voltage
LM2671MX-5.0	TI	获取价格	LM2671 SIMPLE SWITCHER Power Converter High Efficiency 500mA Step-Down Voltage
LM2671MX-5.0	NSC	获取价格	SIMPLE SWITCHER Power Converter High Efficiency 500mA Step-Down Voltage Regulator with Fea

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