The LM5070 is the first single-chip power device (PD) solution to feature the high performance and tiny package footprint needed to dramatically simplify the design of systems that use power over Ethernet (PoE), claims its manufacturer, National Semiconductor. PoE networks power devices such as IP phones, security cameras, wLAN nodes and even musical instruments through Ethernet networking cables and ports. While other solutions use two or three chips, National claims its LM5070 (in small-footprint LLP-16 or TSSOP-16) is the industry's first single-chip PD interface port and pulse-width modulator (PWM) controller that meets the IEEE 802.3af standard. The LM5070 integrates an 80 V, 400 mA line connection switch and associated PoE interface circuits with a DC-DC controller that steps down the 48 V input to power various loads. It features an operating voltage of 75 V max, user-programmable oscillator frequency up to 1 MHz and over-temperature protection.
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