The growing availability of digital content and falling prices of HDDs and LCD panels are driving growth of the Portable Media Player (PMP) market. The ability to download and store music, movies,TV programs and games is expected to make PMPs the center of the mobile digital lifestyle.Multiple interfaces and charging systems can expose the PMP to damage caused by misconnection of the 5V and 12V lines. Adequate overvoltage protection can help manufacturers meet safety requirements,provide the end-user with a reliable product, and reduce warranty costs.
Although typical computer power supplies provide regulated lines at 5V +/- 5%, and 12V +/-5%, the voltage at these lines may, under certain circumstances, exceed 5.25V, and 12.6V, resulting in damage to the system or unprotected peripherals. Voltage spikes can occur when there is inductance in the power bus, generating a rapid change in current. This change can result from a hot disconnect of a peripheral, an internal system shutdown, or other internal power fluctuations.