Power switches offer Enhanced USB port protection

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By eeNews Europe

The 2 A rated, high-side power switches ensure fast and accurate latching-off of output current in the event of over-current detection. They also offer a choice of active-low enable and active-high enable operation and are optimized for selfpowered and bus-powered USB 2.0 and 3.0 and other 3 V to 5 V hot-swap consumer electronics, computing, and communication applications, such as notebook computers and set-top boxes.

To increase overall system robustness, the power switches’ fast short-circuit response time of 2 μs 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 70 mΩ under 2 A continuous operation.

Providing a complete protection solution for any equipment subject to shortcircuits 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 DFN3030E-8 and industry-standard SO-8 and MSOP-8-EP packages.

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