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參數(shù)資料
| 型號： | LM3544MX-L |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Quad Port USB Power Distribution Switch and Over-Current Protection |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封裝： | SOIC-16 |
| 文件頁數(shù)： | 1/13頁 |
| 文件大小： | 349K |
| 代理商： | LM3544MX-L |
LM3544
Quad Port USB Power Distribution Switch and
Over-Current Protection
General Description
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.
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.
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,
High-Powered USB Functions, Low-Powered USB func-
tions, and Bus-Powered USB Hubs can all be powered off a
Root or Self-Powered USB Hub containing the LM3544.
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.
Features
n
90m
(typ.) High-Side MOSFET Switch
n
500mA Continuous Current per Port
n
7 ms Fault Flag Delay Filters Hot-Plug Events
n
Industry Standard Pin Order
n
Short Circuit Protection with Power-Saving Current
Foldback
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
n
Ambient Temperature Range: 40C to 85C
Applications
n
USB Root, Self-Powered, and Bus-Powered Hubs
n
USB Devices such as Monitors and Printers
n
General Purpose High Side Switch Applications
10120832
10120833
Functional Diagram
10120801
March 2001
L
2001 National Semiconductor Corporation
DS101208
www.national.com
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| LM3544MX-L/NOPB | 功能描述:電源開關(guān) IC - USB RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| LM3549 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Evaluation Kit high power LED driver with up to 700mA |
| LM3549SQ/NOPB | 功能描述:LED照明驅(qū)動器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| LM3549SQE/NOPB | 功能描述:LED照明驅(qū)動器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| LM3549SQEV/NOPB | 功能描述:LED 照明開發(fā)工具 LM3549SQ EVAL BOARD RoHS:否 制造商:Fairchild Semiconductor 產(chǎn)品:Evaluation Kits 用于:FL7732 核心: 電源電壓:120V 系列: 封裝: |
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