Datasheet > LM3489Q

LM3489Q

更新时间： 2024-11-23 05:42:03

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
16页	354K
描述
Hysteretic PFET Buck Controller with Enable Pin

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LM3489Q 数据手册

June 23, 2008

LM3489/LM3489Q

Hysteretic PFET Buck Controller with Enable Pin

High efficiency 93%

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General Description

±1.3% (±2% over temp) internal reference

The LM3489 is a high efficiency PFET switching regulator

100% duty cycle operation

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controller that can be used to quickly and easily develop a

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 ar-

chitecture also allows for low component count as well as

ultra-low dropout, 100% duty cycle operation. Another 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.

Maximum operation frequency > 1MHz

Current limit protection

Dedicated enable pin (on if unconnected)

Shutdown mode draws only 7µA supply current

MSOP-8

LM3489 is AEC-Q100 Grade 1 qualified

Applications

Set-Top Box

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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 op-

eration over a range of output currents.

DSL/Cable Modem

PC/IA

Auto PC

TFT Monitor

Battery Powered Portable Applications

Distributed Power Systems

Features

Always On Power

Easy to use control methodology

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High Power LED Driver

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No control loop compensation required

Automotive

Wide 4.5V to 35V input range

1.239V to V_INadjustable output range

Typical Application Circuit

20186908

201869

www.national.com

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与LM3489Q相关器件

型号	品牌	获取价格	描述	数据表
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
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LM3489QMMX	NSC	获取价格	Hysteretic PFET Buck Controller with Enable Pin
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