Datasheet > LM3544

LM3544

更新时间： 2024-11-13 22:51:55

品牌	Logo	应用领域
美国国家半导体 - NSC		开关
页数	文件大小	规格书
13页	351K
描述
Quad Port USB Power Distribution Switch and Over-Current Protection

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LM3544 数据手册

March 2001

LM3544

Quad Port USB Power Distribution Switch and

Over-Current Protection

General Description

Features

n 90mΩ (typ.) High-Side MOSFET Switch

n 500mA Continuous Current per Port

The LM3544 is a quad high-side power switch that is an

excellent choice for use in Root, Self-Powered and

Bus-Powered USB (Universal Serial Bus) Hubs. Indepen-

dent port enables, flag signals to alert USB controllers of

error conditions, controlled start-up in hot-plug events, and

short circuit protection all satisfy USB requirements.

n 7 ms Fault Flag Delay Filters Hot-Plug Events

n Industry Standard Pin Order

n Short Circuit Protection with Power-Saving Current

Foldback

The LM3544 accepts input voltages between 2.7V and 5.5V.

The Enable logic inputs, available in active-high and

active-low versions, can be powered off any voltage in the

2.7V to 5.5V range. The LM3544 limits the continuous

current through a single port to 1.25A (max.) when it is

shorted to ground.

n Thermal Shutdown Protection

n Undervoltage Lockout

n Recognized by UL and Nemko CB

n Input Voltage Range: 2.7V to 5.5V

n 5µA Maximum Standby Supply Current

n 16-Pin SOIC Package

The low on-state resistance of the LM3544 switches ensures

the LM3544 will satisfy USB voltage drop requirements,

even when current through a switch reaches 500 mA. Thus,

n Ambient Temperature Range: −40˚C to 85˚C

High-Powered USB Functions, Low-Powered USB func- Applications

tions, and Bus-Powered USB Hubs can all be powered off a

Root or Self-Powered USB Hub containing the LM3544.

n USB Root, Self-Powered, and Bus-Powered Hubs

n USB Devices such as Monitors and Printers

n General Purpose High Side Switch Applications

Added features of the LM3544 include current foldback to

reduce power consumption in current overload conditions,

thermal shutdown to prevent device failure caused by

high-current overheating, and undervoltage lockout to keep

switches from operating if the input voltage is below

acceptable levels.

10120832

10120833

Functional Diagram

10120801

DS101208

www.national.com

12 3 4 5 6 7...13

中文翻译

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与LM3544相关器件

型号	品牌	获取价格	描述	数据表
LM3544M-H	NSC	获取价格	Quad Port USB Power Distribution Switch and Over-Current Protection
LM3544M-H/NOPB	TI	获取价格	2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16, LEAD FREE, SOIC-16
LM3544M-L	NSC	获取价格	Quad Port USB Power Distribution Switch and Over-Current Protection
LM3544M-L	TI	获取价格	4 通道、0.5A 负载、2.7-5.5V、90mΩ USB 电源开关 \| D \| 16
LM3544M-L/NOPB	TI	获取价格	4 通道、0.5A 负载、2.7-5.5V、90mΩ USB 电源开关 \| D \| 16
LM3544MX-H	NSC	获取价格	Quad Port USB Power Distribution Switch and Over-Current Protection
LM3544MX-H/NOPB	TI	获取价格	2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16, SOIC-16
LM3544MX-L	NSC	获取价格	Quad Port USB Power Distribution Switch and Over-Current Protection
LM3544MX-L	TI	获取价格	2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16, SOIC-16
LM3544MX-L/NOPB	TI	获取价格	4 通道、0.5A 负载、2.7-5.5V、90mΩ USB 电源开关 \| D \| 16

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