Datasheet > LM27241MTC

LM27241MTC

更新时间： 2024-11-12 22:51:55

品牌	Logo	应用领域
美国国家半导体 - NSC		移动系统控制器
页数	文件大小	规格书
27页	1331K
描述
Synchronous Buck Regulator Controller for Mobile Systems

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LM27241MTC 数据手册

May 2005

LM27241

Synchronous Buck Regulator Controller for Mobile

Systems

General Description

Features

n Input voltage range from 5.5V to 28V

n Forced-PWM or Pulse-skip modes

n Lossless bottom-side FET current sensing

n Adaptive duty cycle clamping

The LM27241 is an adjustable 200kHz-500kHz single chan-

nel voltage-mode controlled high-speed synchronous buck

regulator controller. It is ideally suited for battery powered

applications such as laptop and notebook computers. The

LM27241 requires only N-channel FETs for both the upper

and lower positions of the synchronous stage. It features line

feedforward to improve the response to input transients. At

very light loads, the user can choose between the high-

efficiency Pulse-skip mode or the constant frequency

Forced-PWM mode. Lossless current limiting without the use

of external sense resistor is made possible by sensing the

voltage drop across the bottom FET. A unique adaptive duty

cycle clamping technique is incorporated to significantly re-

duce peak currents under abnormal load conditions. The

input voltage range is 5.5V to 28V while the output voltage is

adjustable down to 0.6V.

n High current N-channel FET drivers

n Low shutdown supply currents

n Reference voltage accurate to within 1.5%

n Output voltage adjustable down to 0.6V

n Power Good flag and Chip Enable

n Under-voltage lockout

n Over-voltage/Under-voltage protection

n Soft-start and Soft-shutdown

n Switching frequency adjustable 200kHz-500kHz

Applications

Standard supervisory and control features include soft-start,

power good, output under-voltage and over-voltage protec-

tion, under-voltage lockout, soft-shutdown and enable.

n Notebook Chipset Power Supplies

n Low Output Voltage High Efficiency Buck Regulators

Typical Application

See Figure 17 for Expanded View

20120104

DS201201

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与LM27241MTC相关器件

型号	品牌	获取价格	描述	数据表
LM27241MTCX	NSC	获取价格	Synchronous Buck Regulator Controller for Mobile Systems
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LM2724ALDX	NSC	获取价格	High Speed 3A Synchronous MOSFET Driver
LM2724ALDX/NOPB	TI	获取价格	3.2A HALF BRDG BASED MOSFET DRIVER, DSO8, LLP-8
LM2724AM	NSC	获取价格	High Speed 3A Synchronous MOSFET Driver
LM2724AM/NOPB	ROCHESTER	获取价格	3.2 A HALF BRDG BASED MOSFET DRIVER, PDSO8, SO-8
LM2724AMX	NSC	获取价格	High Speed 3A Synchronous MOSFET Driver