LM3485MM

更新时间： 2024-11-25 22:51:55

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	372K
描述
Hysteretic PFET Buck Controller

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LM3485MM 数据手册

May 2002

LM3485

Hysteretic PFET Buck Controller

n 4.5V to 35V wide input range

n 1.242V to V_INadjustable output range

n High Efficiency 93%

General Description

The LM3485 is a high efficiency PFET switching regulator

controller that a system designer can use to quickly and

easily develop a small, low cost, switching buck regulator for

a wide range of applications. The use of a hysteretic control

scheme provides for simple design without any control loop

stability concerns using a wide variety of external compo-

nents. The PFET architecture also allows for low component

count as well as ultra-low dropout operation. Another benefit

is high efficiency operation at light loads without an increase

in output ripple. Current limit protection circuit is provided by

measuring the voltage across the PFET’s R_DSONthus elimi-

nating a costly sense resistor. The current limit can be ad-

justed allowing for designs at various output currents and

costs.

1.3% ( 2% over temp) internal reference

n 100% duty cycle

n Maximum operating frequency 1MHz

n Current limit protection

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

Features

n Easy to use control methodology

n No control loop compensation required

Typical Application Circuit

20034608

DS200346

www.national.com

12 3 4 5 6 7...15

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与LM3485MM相关器件

型号	品牌	获取价格	描述	数据表
LM3485MM/NOPB	NSC	获取价格	IC SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO8, PLASTIC, MSOP-8, Switching Re
LM3485MM/NOPB	TI	获取价格	4.5 至 35V 滞环非同步 PFET 降压控制器 \| DGK \| 8 \| -40 to
LM3485MM-NOPB	TI	获取价格	Hysteretic PFET Buck Controller
LM3485MMX	NSC	获取价格	Hysteretic PFET Buck Controller
LM3485MMX	TI	获取价格	Hysteretic PFET Buck Controller
LM3485MMX/NOPB	NSC	获取价格	IC SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO8, PLASTIC, MSOP-8, Switching Re
LM3485MMX/NOPB	TI	获取价格	4.5 至 35V 滞环非同步 PFET 降压控制器 \| DGK \| 8 \| -40 to
LM3485MMX-NOPB	TI	获取价格	Hysteretic PFET Buck Controller
LM3485MWC	NSC	获取价格	IC,SMPS CONTROLLER,VOLTAGE-MODE,DIE
LM3485MWC	TI	获取价格	IC,SMPS CONTROLLER,VOLTAGE-MODE,DIE