National Semiconductor Introduces Industry’s First Single-Chip Power over Ethernet Controller for Higher-Power PoE Applications

National Semiconductor Introduces Industry's First Single-Chip Power over Ethernet Controller for Higher-Power PoE Applications

National Semiconductor Corporation (NYSE: NSM), a worldwide leader in power management technology has introduced its latest Power over Ethernet (PoE) device, the industry’s first single-chip PoE controller for higher-power PoE applications. The LM5072, which integrates a programmable power interface port and a pulse-width modulation (PWM) controller, allows designers to operate PoE appliances at higher power levels than standard IEEE 802.3af devices.

100V LM5072 Integrates Power Interface Port and PWM Controller; Also Supports Applications that Operate from Auxiliary Power Sources such as AC Adaptors

National designed the LM5072 with programmable current limiting that allows it to draw up to 25W from a PoE-enabled port, since many emerging PoE applications require power that exceeds the limit of the existing standard. For standard 802.3af Powered Devices (PDs), the current may be programmed to any value between 150 mA and 800 mA, or the programming resistor can be simply disconnected to switch the LM5072 to the default mode with 440 mA maximum current draw.