Part # LM3526 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM3526 Dual Port USB Power Switch and Over-Current Protection


Part Details:

LM3526 March 2005 Dual LM3526Dual Port USB Power Switch and Over-Current Port ProtectionGeneral Description Features USB The LM3526 provides Universal Serial Bus standard power n Compatible with USB1.1 and USB 2.0 switch and over-current protection for all host port applica- n 1 ms fault flag delay filters Hot-Plug events tions. The dual port device is ideal for Notebook and desktop Power n Smooth turn-on eliminates in-rush induced voltage drop PC s that supply power to more than one port. n UL recognized component: REF# 205202 A 1 ms delay on the fault flag output prevents erroneous n 1A nominal short circuit output current protects PC overcurrent reporting caused by in-rush currents during hot- power supplies plug events. n Thermal shutdown protects device in direct short Switch The dual stage thermal protection circuit in the LM3526 condition provides individual protection to each switch and the entire n 500mA minimum continuous load current device. In a short-circuit/over-current event, the switch dis- n Small SO-8 package minimizes board space sipating excessive heat is turned off, allowing the second n 2.7V to 5.5V input voltage range switch to continue to function uninterrupted. n 140 m Max. switch resistance and The LM3526 accepts an input voltage between 2.7V and n 1 µA Max. standby current 5.5V allowing use as a device-based in-rush current limiter n 200 µA Max. operating current for 3.3V USB peripherals, as well as Root and Self-Powered Over-Current Hubs at 5.5V. The Enable inputs accept both 3.3V and 5.0V n Under-voltage lockout (UVLO) logic thresholds. Applications The small size, low R , and 1 ms fault flag delay make the ON LM3526 a good choice for root hubs as well as per-port n Universal Serial Bus (USB) Root Hubs including power control in embedded and stand-alone hubs. Desktop and Notebook PC n USB Monitor Hubs n Other Self-Powered USB Hub Devices n High Power USB Devices Requiring In-rush Limiting


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LM3526.pdf Datasheet