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Power switch ups power density in USB port protection

Posted: 09 May 2013 ?? ?Print Version ?Bookmark and Share

Keywords:power switch? LED TV? notebook?

Diodes has introduced a family of current-limited power switches that claim to offer high current handling in an ultra-small (2 x 2mm) package. According to the company, the devices enable power density to be increased in the protection of multiple USB3.0 ports used in applications such as set-top boxes, LED TVs and notebook computers. The six single-channel devices have an on-resistance of only 70m and cover maximum continuous output currents up to 2.5A, detailed the company.

For any applications subject to heavy capacitive loads and a possibility of short circuit, the switches provide a robust port protection solution, comprising reverse-current blocking, over-current, over-temperature, under-voltage lockout and short-circuit protection, said Diodes. All devices also integrate an output discharge function to ensure controlled discharging of the output capacitor. In addition, the switches' fast short-circuit response time of 2?s prevents any unnecessary system shutdown or restart.

With an input voltage range of 2.7-5.5V, all devices are suited to 3.3V and 5V rail systems. The AP2501 and AP2511 are, respectively, active-low and active-high enabled and are footprint-compatible with the AP2301 and AP2311 devices handling a 2A continuous output current.

The AP2401 and AP2411 are also 2A rated power switches but provide in addition an output latch-off function that responds to an over current excursion, enabling further optimisation of fault behaviour management. All six power switches also feature an open-drain, over-current fault flag with a 7ms deglitch time to prevent false reporting.

The devices are also offered in SO8, MSOP-8/EP and U DFN3030-8 package options. Ambient operating temperature range is -40C to 85C.

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