LM3743 datasheet(1/23 Pages) NSC

部件名	LM3743

功能描述	N-Channel FET Synchronous Buck Controller for Low Output Voltages

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制造商	NSC [National Semiconductor (TI)]

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LM3743

N-Channel FET Synchronous Buck Controller for Low

Output Voltages

General Description

The LM3743 is a voltage mode PWM buck controller which

implements synchronous rectification. It provides a low cost,

fault tolerant, and efficient point of load solution. To reduce

component count several parameters are fixed, such as

switching frequency and the short circuit protection level. For

example the LM3743 has an operating switching frequency

of 300 kHz or 1 MHz and a fixed 500 mV high side current

limit for switch node short-circuit protection. LM3743 is a

very fault tolerant IC with switch node short-circuit, output

undervoltage protection, and the ability to self recover after

the removal of the fault. It avoids the need to over design

components due to thermal runaway during a fault condition,

thus resulting in a lower cost solution. It employs a propri-

etary monotonic glitch free pre-bias start-up method suited

for FPGAs and ASIC logic devices. A 0.8V internal reference

with ±1.75% accuracy is ideal for sub-volt conversion. An

external programmable soft-start allows for tracking and tim-

ing flexibility. The driver features 1.6

Ω of pull-up resistance

and 1

Ω of pull-down drive resistance for high power density

and very efficient power processing.

Features

n

Input voltage from 3.0V to 5.5V

n

Output voltage adjustable down to 0.8V

n

Reference accuracy: ±1.75%, over full temperature and

input voltage range

n

Low-side sensing programmable current limit

n

Fixed high-side sensing for supplemental short-circuit

protection

n

Undervoltage protection

n

Hiccup mode protection eliminates thermal runaway

during fault conditions

n

Externally programmable soft-start with tracking

capability

n

Switching frequency options of 1 MHz or 300 kHz

n

Pre-bias start-up capability

n

MSOP-10 package

Applications

n

ASIC/FPGA/DSP core power

n

Broadband Communications

n

Multi-media Set Top Boxes

n

Networking Equipment

n

Printers/Scanners

n

Servers

n

Low Voltage Distributed Power

Typical Application

20177401

September 2006

DS201774

www.national.com

类似零件编号 - LM3743

制造商	部件名	数据表	功能描述
National Semiconductor ...	LM3743	602Kb / 28P	High-Performance Synchronous Buck Controller with Comprehensive Fault Protection Features
Texas Instruments	LM3743	1Mb / 38P	[Old version datasheet] High-Performance Synchronous Buck Controller with Comprehensive Fault Protection Features
National Semiconductor ...	LM3743MM-1000	602Kb / 28P	High-Performance Synchronous Buck Controller with Comprehensive Fault Protection Features
Texas Instruments	LM3743MM-1000/NOPB	1Mb / 38P	[Old version datasheet] High-Performance Synchronous Buck Controller with Comprehensive Fault Protection Features
National Semiconductor ...	LM3743MM-300	602Kb / 28P	High-Performance Synchronous Buck Controller with Comprehensive Fault Protection Features

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