AP21XX power switches improve system robustness

The single-channel AP2101 and AP2111 provide a continuous output current capability up to 2A and have been optimised for use in self-powered and bus-powered USB and other 3-5V hot-swap applications.

Provided in both SO-8 and MSOP-8L-EP packages, the power switches are said to be a simple and cost-effective form-fit for a range of consumer electronics, communications and computing products.

Described as high-side devices, the AP2101 and AP2111 are said to offer designers the choice of active-low and active-high enable respectively.

Characterised by a fast transient response time of 5us, the devices prevent unnecessary system shutdown/restart and generally improve overall system robustness.

In addition, the power switches' automatic output discharge function ensures a quick and well-defined discharge of the output voltage capacitor.

Like all other devices in the AP21XX family, the AP2101 and AP2111 provide a complete protection solution for applications subject to heavy capacitive loads and the prospect of short-circuits.

The AP21XX devices offer reverse current blocking, over-current, over-temperature and short-circuit protection as well as controlled rise time and under-voltage lockout functionality.

To help reduce system rail power requirements and associated circuit costs, the AP2101 and AP2111 also have a 2.45A current-limiting tolerance.

A 7ms deglitch capability on the open drain flag output prevents false over-current reporting and requires no additional external components.