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Power switches protect USB ports from sudden tripping

Posted: 03 Oct 2008 ?? ?Print Version ?Bookmark and Share

Keywords:power switch? USB port? computing?

Diodes Inc. has released a family of 12 USB power switches, offering a cost effective and small form that may be used for USB ports in multiple consumer and computing applications.

Both single and dual channel power switches are available, with all devices being developed for self-powered and bus-powered USB applications and fully compliant with all USB standards.

The AP21XX high-side power switch range has been produced for USB port applications that need fast response, high accuracy over-current and over-temperature protection, such as HD TVs, STBs and PCs. Giving designers 0.75A, 1.5A and 2.1A current limiting options and a wide array of active-high and active-low enable, the AP21XX provides port protection in a host of different systems.

The power switches have an internal sensing FET, which checks over-current conditions without raising series resistance in the current path and an over-temperature sensor. If either over-current or over-temperature conditions occur, then the device switches into its current limiting mode. To prevent unwanted tripping when a high capacity load is connected to the device output, a 7ms deglitch timeout has also been included in the AP21XX's architecture.

The USB power switch family is packed in small footprint SOT25, SOP-8L and MSOP-8L-EP packages. All of them are direct substitutes for existing industry standard parts. Device operating ambient temperature ranges from -40C to 85C.

- Ismini Scouras

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