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参数资料
| 型号： | LM3544MX-H/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封装： | SOIC-16 |
| 文件页数： | 1/13页 |
| 文件大小： | 785K |
| 代理商： | LM3544MX-H/NOPB |
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. Independent
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 accept-
able levels.
Features
n
Compatible with USB1.1 and USB 2.0
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
5A 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
April 2005
LM3544
Quad
Port
USB
Power
Distribution
Switch
and
Over-Current
Protection
2005 National Semiconductor Corporation
DS101208
www.national.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM3544MX-L | 功能描述:电源开关 IC - USB RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| LM3544MX-L/NOPB | 功能描述:电源开关 IC - USB RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| LM3549 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Evaluation Kit high power LED driver with up to 700mA |
| LM3549SQ/NOPB | 功能描述:LED照明驱动器 RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| LM3549SQE/NOPB | 功能描述:LED照明驱动器 RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
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