1FEATURES
2• Compatible with USB1.1 and USB 2.0
• 1 ms Fault Flag Delay Filters Hot-Plug Events
• Smooth Turn-on Eliminates In-rush Induced
Voltage Drop
• UL Recognized Component: REF# 205202
• 1A Nominal Short Circuit Output Current
Protects PC Power Supplies
• Thermal Shutdown Protects Device in Direct
Short Condition
• 500mA Minimum Continuous Load Current
• Small SOIC-8 package minimizes board space
• 2.7V to 5.5V Input Voltage Range
• 140 mΩ Max. Switch Resistance
• 1 μA Max. Standby Current
• 200 μA Max. Operating Current
• Under-voltage Lockout (UVLO)

APPLICATIONS
• Universal Serial Bus (USB) Root Hubs standincluding
Desktop and Notebook PC
• USB Monitor Hubs
• Other Self-Powered USB Hub Devices
• High Power USB Devices Requiring In-rush
Limiting
• General Purpose High Side Switch
Applications

DESCRIPTION
The LM3526 provides Universal Serial Bus standard
power switch and over-current protection for all host
port applications. The dual port device is ideal for
Notebook and desktop PC's that supply power to
more than one port.
A 1 ms delay on the fault flag output prevents
erroneous overcurrent reporting caused by in-rush
currents during hot-plug events.
The dual stage thermal protection circuit in the
LM3526 provides individual protection to each switch
and the entire device. In a short-circuit/over-current
event, the switch dissipating excessive heat is turned
off, allowing the second switch to continue to function
uninterrupted.
The LM3526 accepts an input voltage between 2.7V
and 5.5V allowing use as a device-based in-rush
current limiter for 3.3V USB peripherals, as well as
Root and Self-Powered Hubs at 5.5V. The Enable
inputs accept both 3.3V and 5.0V logic thresholds.
The small size, low RON, and 1 ms fault flag delay
make the LM3526 a good choice for root hubs as well
as per-port power control in embedded and standincluding
alone hubs.