LM22674

更新时间： 2024-11-09 05:41:59

品牌	Logo	应用领域
美国国家半导体 - NSC		稳压器
页数	文件大小	规格书
14页	553K
描述
500 mA SIMPLE SWITCHER®, Step-Down Voltage Regulator with Precision Enable

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LM22674 数据手册

December 18, 2009

LM22674

500 mA SIMPLE SWITCHER®, Step-Down Voltage

Regulator with Precision Enable

General Description

Features

The LM22674 series of regulators are monolithic integrated

circuits which provide all of the active functions for a step-

down (buck) switching regulator capable of driving up to 500

mA loads with excellent line and load regulation characteris-

tics. High efficiency (>90%) is obtained through the use of a

low ON-resistance N-channel MOSFET. The series consists

of a fixed 5V output and an adjustable version.

Wide input voltage range: 4.5V to 42V

■

Internally compensated voltage mode control

Stable with low ESR ceramic capacitors

200 mΩ N-channel MOSFET

Output voltage options:

-ADJ (outputs as low as 1.285V)

-5.0 (output fixed to 5V)

The SIMPLE SWITCHER^®concept provides for an easy to

use complete design using a minimum number of external

components and National’s WEBENCH^®design tool.

National’s WEBENCH^®tool includes features such as exter-

nal component calculation, electrical simulation, thermal sim-

ulation, and Build-It boards for easy design-in. The switching

clock frequency is provided by an internal fixed frequency os-

cillator which operates at 500 kHz. The LM22674 series also

has built in thermal shutdown, current limiting and an enable

control input that can power down the regulator to a low 25

µA quiescent current standby condition.

±1.5% feedback reference accuracy

Switching frequency of 500 kHz

-40°C to 125°C operating junction temperature range

Precision enable pin

■

Integrated boot diode

Integrated soft-start

Fully WEBENCH^®enabled

Step-down and inverting buck-boost applications

Package

PSOP-8 (Exposed Pad)

■

Applications

Industrial Control

■

Telecom and Datacom Systems

Embedded Systems

Automotive Telematics and Body Electronics

Conversions from Standard 24V, 12V and 5V Input Rails

■

Simplified Application Schematic

30076901

300769

www.national.com

12 3 4 5 6 7...14

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与LM22674相关器件

型号	品牌	获取价格	描述	数据表
LM22674_15	TI	获取价格	LM22674/-Q1 42 V, 500 mA SIMPLE SWITCHERÂ® St
LM22674MR-5.0	NSC	获取价格	500 mA SIMPLE SWITCHER®, Step-Down Voltage Re
LM22674MR-5.0/NOPB	TI	获取价格	LM22674/LM22674-Q1 42V, 500 mA SIMPLE SWITCHE
LM22674MR-ADJ	NSC	获取价格	500 mA SIMPLE SWITCHER®, Step-Down Voltage Re
LM22674MR-ADJ/NOPB	TI	获取价格	LM22674/LM22674-Q1 42V, 500 mA SIMPLE SWITCHE
LM22674MRE-5.0	NSC	获取价格	500 mA SIMPLE SWITCHER®, Step-Down Voltage Re
LM22674MRE-5.0/NOPB	TI	获取价格	LM22674/LM22674-Q1 42V, 500 mA SIMPLE SWITCHE
LM22674MRE-ADJ	NSC	获取价格	500 mA SIMPLE SWITCHER®, Step-Down Voltage Re
LM22674MRE-ADJ/NOPB	TI	获取价格	LM22674/LM22674-Q1 42V, 500 mA SIMPLE SWITCHE
LM22674MRX-5.0	NSC	获取价格	500 mA SIMPLE SWITCHER®, Step-Down Voltage Re

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