LM2743

更新时间： 2024-11-24 22:51:47

品牌	Logo	应用领域
美国国家半导体 - NSC		稳压器控制器
页数	文件大小	规格书
23页	648K
描述
N-Channel FET Synchronous Buck Regulator Controller for Conversion from 3.3V

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LM2743 数据手册

April 2004

LM2743

N-Channel FET Synchronous Buck Regulator Controller

for Conversion from 3.3V

General Description

Features

n MOSFET input voltage (V_IN) from 1V to 16V (Note 2)

n IC input voltage (V_CC) from 3V to 6V

n Output voltage adjustable down to 0.6V

n Power good flag and output enable

n Output over-voltage and under-voltage flag

n FB voltage: 2% over temperature

n Current limit without series sense resistor

n Adjustable soft start

The LM2743 is a high-speed, N-Channel synchronous buck

regulator controller with a 2%, 0.6V feedback reference volt-

age intended to make down conversion from 3.3V to as low

as 0.6V easy. A fixed-frequency voltage-mode PWM control

architecture is used, that is adjustable from 50kHz to 2MHz

through an external resistor. This wide range of PWM fre-

quencies gives the power supply designer the flexibility to

make tradeoffs among component size, cost, noise and

efficiency. The power MOSFETs can run on a separate 1V to

16V (Input Voltage, V_IN) (Note 2) rail while the regulator is

biased from a 3V to 6V (IC Input Voltage, V_CC), 2mA rail. A

power-good flag, precision shutdown threshold and soft start

features make power supply tracking and sequencing easy.

The LM2743 employs output under-voltage and over-voltage

flag, and current limit. Current limit is achieved by monitoring

the voltage drop across the on resistance of the low-side

MOSFET. The adaptive non-overlapping MOSFET gate driv-

ers help avoid potential shoot-through problems while main-

taining high efficiency. Both high-side and low-side MOS-

FETs are the lower cost N-Channel type, and the IC can

accept a bootstrap structure to saturate the high-side MOS-

FET for highest efficiency.

n Tracking and sequencing with shutdown and soft start

pins

n Switching frequency from 50 kHz to 2 MHz

n TSSOP-14 package

Applications

n 3.3V Buck Regulation

n Set-Top Boxes/ Home Gateways

n Core Logic Regulators

n High-Efficiency Buck Regulation

Typical Application

20095201

DS200952

www.national.com

12 3 4 5 6 7...23

中文翻译

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与LM2743相关器件

型号	品牌	获取价格	描述	数据表
LM2743_14	TI	获取价格	Low Voltage N-Channel MOSFET Synchronous Buck Regulator Controller
LM2743MTC	TI	获取价格	LM2743 Low Voltage N-Channel MOSFET Synchronous Buck Regulator Controller
LM2743MTC	NSC	获取价格	N-Channel FET Synchronous Buck Regulator Controller for Conversion from 3.3V
LM2743MTC/NOPB	NSC	获取价格	暂无描述
LM2743MTC/NOPB	TI	获取价格	LM2743 Low Voltage N-Channel MOSFET Synchronous Buck Regulator Controller
LM2743MTCX	TI	获取价格	LM2743 Low Voltage N-Channel MOSFET Synchronous Buck Regulator Controller
LM2743MTCX	NSC	获取价格	N-Channel FET Synchronous Buck Regulator Controller for Conversion from 3.3V
LM2743MTCX/NOPB	NSC	获取价格	IC SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PDSO14, ROHS COMPLIANT, PLASTIC, TSS
LM2743MTCX/NOPB	TI	获取价格	LM2743 Low Voltage N-Channel MOSFET Synchronous Buck Regulator Controller
LM2744	NSC	获取价格	Low Voltage N-Channel MOSFET Synchronous Buck Regulator Controller with External Reference

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