LM22678

更新时间： 2024-11-25 05:42:03

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
16页	529K
描述
5A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Precision Enable

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LM22678 数据手册

December 18, 2009

LM22678

5A SIMPLE SWITCHER®, Step-Down Voltage Regulator

with Precision Enable

General Description

Features

The LM22678 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 5A

loads with excellent line and load regulation characteristics.

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

100 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 LM22678 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

TO-263 THIN (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

30076101

300761

www.national.com

12 3 4 5 6 7...16

中文翻译

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与LM22678相关器件

型号	品牌	获取价格	描述	数据表
LM22678_15	TI	获取价格	SIMPLE SWITCHER Step-Down Voltage Regulator With Features
LM22678-Q1	TI	获取价格	SIMPLE SWITCHER Step-Down Voltage Regulator With Features
LM22678QTJ-5.0	TI	获取价格	LM22678/LM22678Q 42V, 5A SIMPLE SWITCHER Step-Down Voltage Regulator with Features
LM22678QTJ-5.0/NOPB	TI	获取价格	SIMPLE SWITCHER Step-Down Voltage Regulator With Features
LM22678QTJ-ADJ	TI	获取价格	LM22678/LM22678Q 42V, 5A SIMPLE SWITCHER Step-Down Voltage Regulator with Features
LM22678QTJ-ADJ/NOPB	TI	获取价格	SIMPLE SWITCHER Step-Down Voltage Regulator With Features
LM22678QTJE-5.0	TI	获取价格	LM22678/LM22678Q 42V, 5A SIMPLE SWITCHER Step-Down Voltage Regulator with
LM22678QTJE-5.0/NOPB	TI	获取价格	5A SIMPLE SWITCHER, Step-Down Voltage Regulator with Precision Enable 7-TO-263 -40 to 125
LM22678QTJE-ADJ	TI	获取价格	LM22678/LM22678Q 42V, 5A SIMPLE SWITCHER Step-Down Voltage Regulator with Features
LM22678QTJE-ADJ/NOPB	TI	获取价格	5A SIMPLE SWITCHER, Step-Down Voltage Regulator with Precision Enable 7-TO-263 -40 to 125

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