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Features
Compatible with USB1.1 and USB 2.0
90mΩ (typ.) High-Side MOSFET Switch
500mA Continuous Current per Port
7 ms Fault Flag Delay Filters Hot-Plug Events
Industry Standard Pin Order
Short Circuit Protection with Power-Saving Current Foldback
Thermal Shutdown Protection
Undervoltage Lockout
Recognized by UL and Nemko
Input Voltage Range: 2.7V to 5.5V
5 µA Maximum Standby Supply Current
16-Pin SOIC Package
Ambient Temperature Range: −40°C to 85°C
Description 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. 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 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.
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, High-Powered USB Functions, Low-Powered USB Functions, and Bus-Powered USB
Hubs can all be powered off a Root or Self-Powered USB Hub containing the LM3543.
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.
Applications
USB Root, Self-Powered, and Bus-Powered Hubs
USB Devices such as Monitors and Printers
General Purpose High Side Switch Applications
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