LM22672

更新时间： 2024-09-16 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
18页	423K
描述
1A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Features

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LM22672 数据手册

December 18, 2009

LM22672

1A SIMPLE SWITCHER®, Step-Down Voltage Regulator

with Features

General Description

Features

The LM22672 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 1A

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

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 switching frequency

can also be adjusted with an external resistor or synchronized

to an external clock up to 1MHz. It is also possible to self-

synchronize multiple regulators to share the same switching

frequency. The LM22672 series also has built in thermal shut-

down, current limiting and an enable control input that can

power down the regulator to a low 25 µA quiescent current

standby condition. An adjustable soft-start feature is provided

by selecting an appropriate external soft-start capacitor.

±1.5% feedback reference accuracy

■

Switching frequency of 500 kHz, adjustable between 200

kHz and 1 MHz

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

Precision enable pin

■

Integrated boot diode

Adjustable 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

30076701

300767

www.national.com

12 3 4 5 6 7...18

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与LM22672相关器件

型号	品牌	获取价格	描述	数据表
LM22672_15	TI	获取价格	SIMPLE SWITCHERÂ® Step-Down Voltage Regulator
LM22672MR-5.0	NSC	获取价格	1A SIMPLE SWITCHER®, Step-Down Voltage Regula
LM22672MR-5.0/NOPB	TI	获取价格	SIMPLE SWITCHERÂ® Step-Down Voltage Regulator
LM22672MR-ADJ	NSC	获取价格	1A SIMPLE SWITCHER®, Step-Down Voltage Regula
LM22672MR-ADJ/NOPB	TI	获取价格	SIMPLE SWITCHERÂ® Step-Down Voltage Regulator
LM22672MRE-5.0	NSC	获取价格	1A SIMPLE SWITCHER®, Step-Down Voltage Regula
LM22672MRE-5.0/NOPB	TI	获取价格	SIMPLE SWITCHERÂ® Step-Down Voltage Regulator
LM22672MRE-ADJ	NSC	获取价格	1A SIMPLE SWITCHER®, Step-Down Voltage Regula
LM22672MRE-ADJ/NOPB	TI	获取价格	SIMPLE SWITCHERÂ® Step-Down Voltage Regulator
LM22672MRX-5.0	NSC	获取价格	1A SIMPLE SWITCHER®, Step-Down Voltage Regula

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