USB interface protection ICs

28 September 2011 Circuit & System Protection

Diodes Incorporated has introduced a new device that delivers enhanced robustness and advanced protection for the USB (Universal Serial Bus) interface in a multitude of applications, where heavy capacitive loads and short circuits could occur when connecting devices via the USB port.

Fully compliant with USB 2.0 and 3.0 standards, the new AP2337 is a single-channel, 1 A high-side power switch optimised for both self-powered and bus-powered applications, and other 3 V to 5 V ‘hot swapping’ applications, for example where peripherals or portable gadgets are connected to, and disconnected from, a desktop or laptop computer or another consumer device without requiring a system reboot.

Protection capabilities of the device include fast short circuit response time of 5 μs, preventing system shutdown and restart; built-in output discharge functionality; low on-resistance of 110 m over 1 A continuous load; reverse current blocking; and output over-voltage protection; all in the space-saving SOT23 package. The AP2337, which is UL recognised (pending) and IEC 60950-1 (CB scheme) certified, offers 3 kV HBM and 300 V MM electrostatic discharge protection.

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