National Semiconductor Introduces Industry’s First Single-Chip, Power over Ethernet Device Controller Designed for Low-Voltage Auxiliary Power Sources

National Semiconductor Introduces Industry's First Single-Chip, Power over Ethernet Device Controller Designed for Low-Voltage Auxiliary Power Sources

National Semiconductor Corporation (NYSE:NSM) announced the industry's first single-chip solution specifically designed for Power over Ethernet (PoE) devices that operate from alternative power sources or the PoE-enabled network. The LM5071 is a Powered Device (PD) interface and DC-DC converter IC that simplifies the design of a variety of PoE applications that require an auxiliary power source such as an AC adapter.

LM5071 Offers Designers Better Flexibility to Operate PoE Powered Devices from AC Adapters as Low as 9.5V or from the Power Sourcing Equipment

Devices powered by a PoE network include IP phones, security cameras and wireless local area network (WLAN) nodes connected through Ethernet networking cables and ports. Operating these PoE devices from alternate power sources is often necessary to relieve the burden on the Power Sourcing Equipment (PSE) or to operate the device on a network that is not PoE-enabled. Current solutions limit the choice of auxiliary power sources, which can drive up overall system cost or complexity.

National’s LM5071 is the industry’s first single-chip, IEEE 802.3af-compliant PD interface port and pulse-width modulator (PWM) controller specifically designed to accept power from external AC adapters. The LM5071 integrates a PD front end that accepts power from the PSE or auxiliary power to a single chip with a DC-DC controller that steps down the input voltage to power various PD loads.