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LM3526M-H-LM3526M-L-LM3526MX-H-LM3526MX-L
Dual Port USB Power Switch and Over-current Protection
LM3526
Dual Port USB Power Switch and Over-Current
Protection
General DescriptionThe LM3526 provides Universal Serial Bus standard power
switch and over-current protectionforall host port applica-
tions. The dual port deviceis idealfor Notebook and desktop
PC’s that supply powerto more than one port.1 ms delayon the fault flag output prevents erroneous
overcurrent reporting causedby in-rush currents during hot-
plug events.
The dual stage thermal protection circuitin the LM3526
provides individual protectionto each switch and the entire
device.Ina short-circuit/over-current event,the switch dis-
sipating excessive heatis turned off, allowing the second
switchto continueto function uninterrupted.
The LM3526 acceptsan input voltage between 2.7V and
5.5V allowing useasa device-based in-rush current limiter
for 3.3V USB peripherals,as wellas Root and Self-Powered
Hubsat 5.5V. The Enable inputs accept both 3.3V and 5.0V
logic thresholds.
The small size, low RON, and1ms fault flag delay makethe
LM3526a good choicefor root hubsas wellas per-port
power controlin embedded and stand-alone hubs.
Features Compatible with USB1.1 and USB2.01ms fault flag delay filters Hot-Plug events Smooth turn-on eliminates in-rush induced voltage drop UL recognized component: REF# 2052021A nominal short circuit output current protectsPC
power supplies Thermal shutdown protects devicein direct short
condition 500mA minimum continuous load current Small SO-8 package minimizes board space 2.7Vto 5.5V input voltage range 140 mΩ Max. switch resistance1µA Max. standby current 200µA Max. operating current Under-voltage lockout (UVLO)
Applications Universal Serial Bus (USB) Root Hubs including
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
Typical Operating Circuit and Connection DiagramLM3526-H
LM3526-L
September 2004
LM3526
Dual
Port
USB
Power
Switch
and
Over-Current
Protection
