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Power switches from Diodes Inc enhance USB port protection

29th June 2011

ES Admin

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Ensuring fast and accurate latching-off of output current in the event of over current detection, the AP2401 and AP2411 single channel power switches from Diodes Incorporated are designed to help raise USB port protection levels. These 2A rated, high-side power switches provide a choice of active low enable and active high enable operation and are optimized for self-powered and bus-powered USB 2.0 and 3.0 and other 3-5V hot-swap consumer electronics applications.

To increase overall system robustness, the power switches’ fast short circuit response time of 2µs means unnecessary system shutdown or restart can be avoided, while their integrated output discharge function provides full and controlled discharge of output capacitor voltage when disabled. To minimize voltage drop losses in higher current systems, the AP24xx devices exhibit an on-resistance of only 70mΩ under 2A continuous operation.

Providing a complete protection solution for any equipment subject to short-circuits and heavy capacitive loads, the power switches incorporate over-current, short-circuit, over-temperature under-voltage lockout and reverse current blocking protection. The power switches’ tight current limiting tolerance also reduces power rail current requirements and therefore overall system cost.

The AP2401 and AP2411 power switches are provided in space-saving 8-leaded DFN3030E-8 and industry standard SO-8 and MSOP-8-EP packages. The parts are priced from $0.21 each in 1k quantities.