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LM3544 - Quad Port USB Power Distribution Switch and Over-Current Protection

Description

The LM3544 is a quad high-side power switch that is an excellent choice for use in Root, Self-Powered and BusPowered USB (Universal Serial Bus) Hubs.

Features

  • of the LM3544 include current foldback to reduce power consumption in current overload conditions, thermal shutdown to prevent device failure caused by highcurrent overheating, and undervoltage lockout to keep switches from operating if the input voltage is below acceptable levels. Features n Compatible with USB1.1 and USB 2.0 n 90mΩ (typ. ) High-Side MOSFET Switch n 500mA Continuous Current per Port n 7 ms Fault Flag Delay Filters Hot-Plug Events n Industry Standard Pin Order n Short Circuit Pr.

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LM3544 Quad Port USB Power Distribution Switch and Over-Current Protection April 2005 LM3544 Quad Port USB Power Distribution Switch and Over-Current Protection General Description The LM3544 is a quad high-side power switch that is an excellent choice for use in Root, Self-Powered and BusPowered 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 LM3544 accepts input voltages between 2.7V and 5.5V. The Enable logic inputs, available in active-high and activelow versions, can be powered off any voltage in the 2.7V to 5.5V range. The LM3544 limits the continuous current through a single port to 1.25A (max.
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