ON Semiconductor has introduced the NCP362, proclaiming it to be the industry’s first overvoltage protection (OVP) device with both integrated current protection and high-speed electrostatic discharge (ESD) protection for USB 2.0 applications in portable, telecom, consumer and computing systems. This integrated device improves safety of USB ports by streamlining design in portable electronics by eliminating the need for standalone OVP, over-current protection (OCP) and transient voltage suppressor (TVS) components that are normally necessary to protect vulnerable portable devices against electrical surge damage and electronic discharge from host, wall adapters, human body and unsuitable after-market AC-DC adapters.
The device, which is placed behind the USB or bottom connector, provides +20 V front end protection for the downstream USB port, thanks to an integrated power MOSFET that can handle 500 mA. Because long cables can induce ringing due to serial inductance in the USB cable, the NCP362 has been designed to open the VBUS line when the voltage transient exceeds the internal over-voltage threshold, which is internally set to 5,675 V. This threshold value can be changed by a metal tweak if a different value is needed for a specific application. In addition, OCP is available, opening the internal MOSFET if the downstream VBUS’s load exceeds 750 mA, supporting 500 mA continuously for the USB ports. This current clamp value can be also adjusted to a lower value to be compliant to 100 mA single or dual ports.
Both protections are very fast – at fewer than 100 nanoseconds – offering an efficient protection level for the downstream transceiver, battery charger devices or Lithium battery to be charged. In addition, the NCP362 offers system level IEC 61000-4-2 ±15 kV ESD protection. The part integrates high-speed ESD diodes for data lines (D+ and D-) and TVS for the VBUS pin of the USB ports. Due to the low capacitance of integrated ESD diodes (0,5 pF), this device is compliant with the USB 2.0 protocol.
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