Analysis

Diodes Incorporated raises USB port protection with single channel power switches

18th December 2009
ES Admin
Diodes Incorporated has introduced 0.5A single channel power switches optimized for USB port protection and other 3V-5V hot swap interconnects. The AP2145 (active low enable) and AP2155 (active high enable) provide complete protection solutions for consumer, computing and communication applications subject to the possibility of heavy capacitive loads and short-circuits.
The power switches are fully compliant with USB standards and are available in industry standard SOP-8L and exposed pad MSOP-8L-EP packages. Their fast 10µs transient response time prevents unnecessary system shutdown or restart, while their accurate 1A current limiting capability helps reduce system rail current requirements and related component costs.

Offering reverse current blocking, over-current, over-temperature and short-circuit protection, as well as controlled rise time and under-voltage lockout, the AP21X5 parts will significantly improve the robustness of USB ports. In addition, an in-built 7ms deglitch period on the Flag output will prevent erroneous over-current reporting, without the need for any external components.

UL and IEC60950-1CB Scheme certified, the power switches meet industry's most rigorous safety standards. Operating temperature rating is -40ºC to +85ºC and current consumption in shutdown mode is a maximum of just 1µA.

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