NATIONAL SEMICONDUCTOR LM3543 User Guide
Summary
Manage power distribution reliably with this triple port USB switch, engineered for superior over-current protection and compatibility with USB 1.1 and USB 2.0 standards. Designed for use in Root, Self-Powered, and Bus-Powered USB Hubs, the LM3543 powers peripherals while ensuring device stability through features like thermal shutdown and short circuit protection. This resource provides detailed technical specifications, functional diagrams, and connection guides necessary for hardware engineers building dependable power management solutions.
Manual Details
| Brand | National |
|---|---|
| Pages | 12 |
| File Size | 751.01 KB |
| Published | June 05, 2026 |
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Frequently Asked Questions
What types of USB hubs can the LM3543 power?
It is suitable for Root, Self-Powered, and Bus-Powered USB Hubs.
Does this device protect against overcurrent or short circuits?
Yes, it includes Short Circuit Protection (1.25A max.) and Over-Current Protection.
What is the continuous current limit for each port?
Each independent port supports a 500mA Continuous Current.
What is the required input voltage range?
The LM3543 accepts input voltages between 2.7V and 5.5V.