Datasheet > LM3489MMX

LM3489MMX

更新时间： 2024-11-23 03:15:11

品牌	Logo	应用领域
美国国家半导体 - NSC		控制器
页数	文件大小	规格书
15页	794K
描述
Hysteretic PFET Buck Controller with Enable Pin

阅读下载

中文翻译

获取价格

数据手册
替代型号

如果您发现信息不准确，欢迎纠错

LM3489MMX 数据手册

May 2006

LM3489

Hysteretic PFET Buck Controller with Enable Pin

n Wide 4.5V to 35V input range

n 1.239V to V_INadjustable output range

The LM3489 is a high efficiency PFET switching regulator

n High efficiency 93%

General Description

controller that can be used to quickly and easily develop a

1.3% ( 2% over temp) internal reference

small, cost effective, switching buck regulator for a wide

range of applications. The hysteretic control architecture

provides for simple design without any control loop stability

concerns using a wide variety of external components. The

PFET architecture also allows for low component count as

well as ultra-low dropout, 100% duty cycle operation. An-

other benefit is high efficiency operation at light loads without

an increase in output ripple. A dedicated Enable Pin provides

a shutdown mode drawing only 7µA. Leaving the Enable Pin

unconnected defaults to on.

n 100% duty cycle operation

n Maximum operation frequency 1MHz

n Current limit protection

n Dedicated enable pin (on if unconnected)

n Shutdown mode draws only 7µA supply current

n MSOP-8

Applications

n Set-Top Box

n DSL/Cable Modem

n PC/IA

n Auto PC

n TFT Monitor

n Battery Powered Portable Applications

n Distributed Power Systems

n Always On Power

n High Power LED Driver

Current limit protection can be implemented by measuring

the voltage across the PFET’s R_DS(ON), thus eliminating the

need for a sense resistor. A sense resistor may be used to

improve current limit accuracy if desired. The cycle-by-cycle

current limit can be adjusted with a single resistor, ensuring

safe operation over a range of output currents.

Features

n Easy to use control methodology

n No control loop compensation required

Typical Application Circuit

20186908

DS201869

www.national.com

12 3 4 5 6 7...15

中文翻译

下载PDF

LM3489MMX 替代型号

型号	品牌	替代类型	描述	数据表
LM3489MM	NSC	功能相似	Hysteretic PFET Buck Controller with Enable Pin

与LM3489MMX相关器件

型号	品牌	获取价格	描述	数据表
LM3489MMX/NOPB	TI	获取价格	具有使能引脚的滞环 PFET 降压控制器 \| DGK \| 8 \| -40 to 125
LM3489Q	NSC	获取价格	Hysteretic PFET Buck Controller with Enable Pin
LM3489-Q1	TI	获取价格	具有使能引脚的汽车级 4.5V 至 35V、滞环非同步 PFET 降压控制器
LM3489QMM	NSC	获取价格	Hysteretic PFET Buck Controller with Enable Pin
LM3489QMM/NOPB	TI	获取价格	具有使能引脚的汽车级 4.5V 至 35V、滞环非同步 PFET 降压控制器 \| DGK
LM3489QMMX	NSC	获取价格	Hysteretic PFET Buck Controller with Enable Pin
LM3489QMMX/NOPB	TI	获取价格	具有使能引脚的汽车级 4.5V 至 35V、滞环非同步 PFET 降压控制器 \| DGK
LM348D	TI	获取价格	QUADRUPLE OPERATIONAL AMPLIFIERS
LM348D	STMICROELECTRONICS	获取价格	FOUR UA741 QUAD BIPOLAR OPERATIONAL AMPLIFIERS
LM348D3	TI	获取价格	IC,OP-AMP,QUAD,BIPOLAR,SOP,14PIN,PLASTIC