LM2734

更新时间： 2024-11-04 22:51:55

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
22页	455K
描述
Thin SOT23 1A Load Step-Down DC-DC Regulator

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中文翻译

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数据手册

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LM2734 数据手册

October 2004

LM2734

Thin SOT23 1A Load Step-Down DC-DC Regulator

General Description

Features

n Thin SOT23-6 package

n 3.0V to 20V input voltage range

n 0.8V to 18V output voltage range

n 1A output current

The LM2734 regulator is a monolithic, high frequency, PWM

step-down DC/DC converter in a 6-pin Thin SOT23 package.

It provides all the active functions to provide local DC/DC

conversion with fast transient response and accurate regu-

lation in the smallest possible PCB area.

n 550kHz (LM2734Y) and 1.6MHz (LM2734X)

switching frequencies

n 300mΩ NMOS switch

With a minimum of external components and online design

™

support through WEBENCH , the LM2734 is easy to use.

The ability to drive 1A loads with an internal 300mΩ NMOS

switch using state-of-the-art 0.5µm BiCMOS technology re-

sults in the best power density available. The world class

control circuitry allows for on-times as low as 13ns, thus

supporting exceptionally high frequency conversion over the

entire 3V to 20V input operating range down to the minimum

output voltage of 0.8V. Switching frequency is internally set

to 550kHz (LM2734Y) or 1.6MHz (LM2734X), allowing the

use of extremely small surface mount inductors and chip

capacitors. Even though the operating frequencies are very

high, efficiencies up to 90% are easy to achieve. External

shutdown is included, featuring an ultra-low stand-by current

of 30nA. The LM2734 utilizes current-mode control and in-

ternal compensation to provide high-performance regulation

over a wide range of operating conditions. Additional fea-

tures include internal soft-start circuitry to reduce inrush

current, pulse-by-pulse current limit, thermal shutdown, and

output over-voltage protection.

n 30nA shutdown current

n 0.8V, 2% internal voltage reference

n Internal soft-start

n Current-Mode, PWM operation

n WEBENCH online design tool

Applications

n Local Point of Load Regulation

n Core Power in HDDs

n Set-Top Boxes

n Battery Powered Devices

n USB Powered Devices

n DSL Modems

n Notebook Computers

Typical Application Circuit

Efficiency vs Load Current

V_IN= 5V, V_OUT= 3.3V

20102301

20102345

™

WEBENCH is a trademark of Transim.

DS201023

www.national.com

12 3 4 5 6 7...22

中文翻译

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与LM2734相关器件

型号	品牌	获取价格	描述	数据表
LM27341	NSC	获取价格	2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization
LM27341	TI	获取价格	1.5A - 具有频率同步的宽输入范围降压稳压器
LM27341_10	NSC	获取价格	2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization
LM27341_15	TI	获取价格	LM27341/LM27342/LM27341-Q1/LM27342-Q1 2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regul
LM27341MY	NSC	获取价格	2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization
LM27341MY/NOPB	TI	获取价格	LM27341/LM27342/LM27341-Q1/LM27342-Q1 2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regul
LM27341MYX	NSC	获取价格	2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization
LM27341MYX/NOPB	TI	获取价格	1.5A - Wide Input Range Buck Regulator with Frequency Synchronization 10-MSOP-PowerPAD -40
LM27341-Q1	TI	获取价格	LM27341/LM27342/LM27341-Q1/LM27342-Q1 2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regul
LM27341QMY	NSC	获取价格	2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization

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