TVS diodes improve surge protection for mobile/automotive device chargers

April 07, 2014 // By Graham Prophet
NXP has a series of 300W TVS diodes in leadless 2 x 2-mm packages; in a minimum of PCB area, they protect the charger port in mobile devices from surge pulses – offering superior electrical performance, high PCB design flexibility and easy routing

The six transient voltage suppressor (TVS) diodes are housed in the small, leadless plastic package DFN2020-3 (2 x 2 mm) with a height of only 0.62 mm. The PTVSxU1UPA product series offers a 300W peak pulse power rating (10/1000 µsec) and reverse stand-off voltages from 7.5 to 26V. These new AEC-Q101 qualified diodes are suited to protect voltage-sensitive components against transient voltage in various applications, such as the charger port in mobile devices.

Surge pulses from the power supply, for example via a car charger, are – NXP asserts – a severe threat for the charger port V BUS line of smart phones and other portables. Standard ESD protection devices are no longer sufficient to protect application circuits from damage, and as a result, devices with higher surge robustness are required. Low leakage current of only 1 nA reduces the power consumption.

This discrete solution, NXP adds, offers superior electrical performance, a higher PCB design flexibility and easier routing than the array of integrated solutions currently available.