Diodes Inc - Higher current power switches optimized for USB
Published Nov 19 2009 [Printer friendly version] [Email article to a friend] [More Power articles]
For higher current applications Diodes Incorporated has added two new
devices to its AP21XX power SWITCH product line. The single-channel AP2101
and AP2111 provide a continuous output current capability up to 2A and have
been optimized 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 seen
as a simple, cost effective form-fit for a wide range of consumer
electronics, communications and computing products. High-side devices, the
AP2101 and AP2111 offer designers the choice of active-low and active-high
enable respectively.
Characterized by a fast transient response time of just 5µs, 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 new devices 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 very tight, 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,
says the company.
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