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LM3543MX-L PDF预览

LM3543MX-L

更新时间： 2024-11-13 22:14:31
品牌 Logo 应用领域
美国国家半导体 - NSC 开关光电二极管
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12页 318K
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Triple Port USB Power Distribution Switch and Over-Current Protection

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March 2001  
LM3543  
Triple 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 LM3543 is a triple 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 LM3543 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 LM3543 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  
n Input Voltage Range: 2.7V to 5.5V  
n 5 µA Maximum Standby Supply Current  
n 16-Pin SOIC Package  
The low on-state resistance of the LM3543 switches ensures  
the LM3543 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 LM3543.  
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 LM3543 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.  
10125832  
10125833  
Functional Diagram  
10125801  
© 2001 National Semiconductor Corporation  
DS101258  
www.national.com  
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