Freescale rolls out single-chip PoE controller

October 10, 2006 -- Freescale Semiconductor has introduced a single-chip PoE controller that combines a powered device interface port supporting the IEEE 802.3af PoE standard and a pulse width modulator (PWM) controller.

Oct 10th, 2006

October 10, 2006 -- Freescale Semiconductor has introduced the MCZ34670 , a single-chip Power over Ethernet (PoE) controller that combines a powered device (PD) interface port supporting the IEEE 802.3af PoE standard and a pulse width modulator (PWM) controller. The device's high level of integration is intended to enable developers to design cost-effective Ethernet-powered end devices with a minimal need for external components.

"While the use of PoE has traditionally been associated with wireless LAN and voice over IP (VoIP) applications, the powered device market continues to gain ground in applications such as RFID tags and network security cameras, as IT managers realize the cost savings, flexibility, and reliability of PoE," notes Marianne D'Aquila, founder and principal analyst of the research firm Information Resources . "Freescale's MCZ34670 controller provides an integrated, programmable solution to meet the needs of existing and future PoE-powered devices."

According to Freescale, the MCZ34670 contains the essential features needed to support the IEEE 802.3af standard and provides comprehensive signature detection and power classification functions for PoE applications. The chip also incorporates thermal protection circuitry to help protect powered devices in case of high power dissipation. Featuring an integrated high-performance switching regulator, the device provides excellent line and load regulation and drives an external power MOSFET with a sense resistor. The switching frequency is adjustable between 100 kHz and 400 kHz with a 50 percent duty-cycle limit; this flexibility is advantageous for applications not designed to exceed an on-time of 50 percent of a given switching frequency and period, says the company.

"The demand for VoIP and wireless access points is creating a significantly larger market opportunity for PoE-capable products," says Arman Naghavi, vice president and general manager of Freescale's Analog, Mixed-Signal & Power division. "Freescale's integrated PoE controller is designed to enable new types of Ethernet end devices to connect to the Ethernet network and receive power safely, efficiently, and cost effectively."

The MCZ34670 is available at a suggested price of $2.08 in 10,000-piece quantities.

Also available, Freescale's KIT34670EGEVBE development tool incorporates an IEEE 802.3af compliant powered device interface with a 5 V isolated output voltage and adjustable UVLO, as well as inrush current. The evaluation board is University of New Hampshire Interoperability Laboratory (UNH-IOL ) tested and compliant, and is priced at $115.

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