LM22677TJ-5.0

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		稳压器开关
页数	文件大小	规格书
16页	391K
描述
5A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Synchronization or Adjustable Switching Frequency

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LM22677TJ-5.0 数据手册

December 18, 2009

LM22677

5A SIMPLE SWITCHER®, Step-Down Voltage Regulator

with Synchronization or Adjustable Switching Frequency

General Description

Features

The LM22677 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 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 LM22677 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.

±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

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

30074101

300741

www.national.com

12 3 4 5 6 7...16

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与LM22677TJ-5.0相关器件

型号	品牌	获取价格	描述	数据表
LM22677TJ-5.0/NOPB	TI	获取价格	LM22677/-Q1 42-V, 5-A SIMPLE SWITCHERÂ®, Step
LM22677TJ-ADJ	NSC	获取价格	5A SIMPLE SWITCHER®, Step-Down Voltage Regula
LM22677TJ-ADJ/NOPB	TI	获取价格	LM22677/-Q1 42-V, 5-A SIMPLE SWITCHERÂ®, Step
LM22677TJE-5.0	NSC	获取价格	5A SIMPLE SWITCHER®, Step-Down Voltage Regula
LM22677TJE-5.0/NOPB	TI	获取价格	LM22677/-Q1 42-V, 5-A SIMPLE SWITCHERÂ®, Step
LM22677TJE-ADJ	NSC	获取价格	5A SIMPLE SWITCHER®, Step-Down Voltage Regula
LM22677TJE-ADJ/NOPB	TI	获取价格	LM22677/-Q1 42-V, 5-A SIMPLE SWITCHERÂ®, Step
LM22678	NSC	获取价格	5A SIMPLE SWITCHER®, Step-Down Voltage Regula
LM22678	TI	获取价格	LM22678/LM22678Q 42V, 5A SIMPLE SWITCHER Step-Down Voltage Regulator with Features
LM22678_15	TI	获取价格	SIMPLE SWITCHER Step-Down Voltage Regulator With Features

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