SC2041

USB power distribution switches are high-side N-channel MOSFET switches with built-in overcurrent protection and low on-state resistance. The SC2041 switch is designed to meet the USB requirements for power switching and maintenance-free fault protection for self-powered & bus-powered hub applications. The SC2041 features low on-state resistance to meet the USB requirement for voltage drop and regulation. The switch is controlled by a shutdown input that is compatible with 3V and 5V logic. The device is active when the shutdown input is low. See SC2051 for an active high version. The device provides short circuit current limiting at a value of less than 1.0A, well below the USB limit of 5A. During an overcurrent condition the device provides a fault notification to signal the USB controller. An integrated thermal protection circuit automatically shuts the switch off when the junction temperature reaches its thermal limit. The switch remains off until the junction temperature drops approximately 20°C. The switch will continue to cycle on and off until the fault is removed. Inrush current limiting prevents voltage drop on an upstream port when the switch is enabled. An undervoltage lockout circuit guarantees the switch is initially off during start-up.