Datasheet
LM3526
www.ti.com
SNVS054E –FEBRUARY 2000–REVISED MARCH 2013
LM3526 Dual Port USB Power Switch and Over-Current Protection
Check for Samples: LM3526
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FEATURES
DESCRIPTION
The LM3526 provides Universal Serial Bus standard
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• Compatible with USB1.1 and USB 2.0
power switch and over-current protection for all host
• 1 ms Fault Flag Delay Filters Hot-Plug Events
port applications. The dual port device is ideal for
• Smooth Turn-on Eliminates In-rush Induced
Notebook and desktop PC's that supply power to
Voltage Drop
more than one port.
• UL Recognized Component: REF# 205202
A 1 ms delay on the fault flag output prevents
erroneous overcurrent reporting caused by in-rush
• 1A Nominal Short Circuit Output Current
currents during hot-plug events.
Protects PC Power Supplies
• Thermal Shutdown Protects Device in Direct
The dual stage thermal protection circuit in the
Short Condition
LM3526 provides individual protection to each switch
and the entire device. In a short-circuit/over-current
• 500mA Minimum Continuous Load Current
event, the switch dissipating excessive heat is turned
• Small SOIC-8 package minimizes board space
off, allowing the second switch to continue to function
• 2.7V to 5.5V Input Voltage Range
uninterrupted.
• 140 mΩ Max. Switch Resistance
The LM3526 accepts an input voltage between 2.7V
• 1 µA Max. Standby Current
and 5.5V allowing use as a device-based in-rush
current limiter for 3.3V USB peripherals, as well as
• 200 µA Max. Operating Current
Root and Self-Powered Hubs at 5.5V. The Enable
• Under-voltage Lockout (UVLO)
inputs accept both 3.3V and 5.0V logic thresholds.
The small size, low R
ON
, and 1 ms fault flag delay
APPLICATIONS
make the LM3526 a good choice for root hubs as well
• Universal Serial Bus (USB) Root Hubs
as per-port power control in embedded and stand-
including Desktop and Notebook PC
alone hubs.
• USB Monitor Hubs
• Other Self-Powered USB Hub Devices
• High Power USB Devices Requiring In-rush
Limiting
• General Purpose High Side Switch
Applications
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