Dual-Power Switches Work With USB Peripherals

This integrated, 3.0V to 5.5V USB dual-power control switch has been specifically designed for self-powered and bus-powered USB computer peripherals. The SP2526 USB switch meets all the specs required for USB compliant power systems and integrates key system control features, such as soft start, over-current protection, fault notification, and enable/disable control. The chip's two independent power switches source 500 mA each and are controlled by separate enables. A 1-ms soft-start and 1.25A short-circuit current limit help to avoid voltage droop in upstream ports and minimize device damage due to excessive current or under voltage supply conditions. The device also features low switch R_DSon (80 milliohms), low quiescent current (100 µA), shutdown, under voltage lockout, and full fault protection, including current limiting and thermal shutdown. The SP2526-1 device has an active-high enable, while the SP2526-2 IC has an active-low enable. The SP2526, which is currently offered in either an 8-pin PDIP or 8-pin nSOIC package, starts at $0.99/10,000.