Diodes Inc. Power Switch Family Protects USB Ports

Diodes Inc. has introduced a family of 12 new USB power switches, providing what is described as a cost effective and small form fit for USB ports in a wide range of consumer and computing applications. Both single and dual channel power switches are available, with all devices being optimised for self-powered and bus-powered USB applications and fully compliant with all USB standards.

The AP21XX high-side power switch range has been created for USB port applications that require fast response, high accuracy over-current and over-temperature protection, such as HD televisions, set top boxes and PCs. Offering designers 0.75, 1.5 and 2.1A current limiting options and a choice of active-high and active-low enable, the AP21XX optimizes port protection in a host of different systems.

The power switches include an internal sensing FET, which monitors for over-current conditions without increasing series resistance in the current path and an over-temperature sensor. If either over-current or over-temperature conditions are sensed, 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 design.

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

AP21XX family devices are priced at $0.35 USD for 1k quantities of single power switches in SOT25.