Power switches designed for USB port protection

31st March 2017

Lanna Deamer

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Featuring a low on resistance to reduce power losses, the AP22811 and AP22804/AP22814 power switches introduced by Diodes Incorporated are optimised for Universal Serial Bus (USB) and other hot-swap applications.

Supporting load currents of 2.0, 2.5 and 3.0A, respectively, this family of devices protects USB ports against over-current, short-circuit and over-temperature conditions and prevents system damage due to reversed currents or voltages. Typical applications include laptop, notebook and tablet PCs, solid-state drives, set-top boxes and similar media devices, as well as various other items of consumer electronic equipment.

A typical RDS (ON) of 50mΩ ensures the AP22811/22804/22814 load switches incur minimal voltage drop and power loss while also providing a fast response to fault conditions. The devices provide a built-in soft start with a 0.6s rise time and an integrated output discharge function controls the complete discharge of the output voltage capacitor. Fault protection is implemented with full auto-recovery and the open-drain fault report Flag Output (FLG), which requires no external components, and features a 6ms blanking time to prevent false over-current reporting.

AP228xx device options allow for active-high or active-low enable inputs and all are offered in SOT-25 and MSOP-8 packages for ease of use. The AP22804 and AP22814 parts are additionally available in the DFN2020-6 package, which can help reduce board area.