Austin, Tex.—Silicon Laboratories touts its
Si3400 as the industry's most highly integrated, IEEE 802.3af compliant, power-over-Ethernet (PoE) controller for powered device (PD) applications. The company says the device is the only PD controller to integrate on-chip diode bridges, a transient surge suppressor, and a switching regulator with driver FET.
Targeted at wireless access points (WAP), voice over IP (VoIP) phones, radio frequency identification (RFID) tag readers, point-of-sale terminals, security systems and cameras, the Si3400 eliminates up to 25 external components compared to competing solutions. This reportedly reduces the PCB footprint by 30 to 50 percent and the total bill-of-material cost by as much as $1.50.
"The Si3400 represents the first product in our power- over-Ethernet family," said Dave Bresemann, vice president. "Our extensive high-voltage design experience has enabled us to solve several board-level analog design challenges, which will help lower costs and accelerate the adoption of PoE technology in a wide array of end products."
The Si3400 controller includes a PD interface with programmable classification and detection signature circuitry, a switching regulator controller, dual current-limited hot-swap switch, comprehensive protection circuitry including thermal shutdown capability and support for both non-isolated and isolated applications. The Si3400 has been designed to operate seamlessly with both 802.3af compliant power sourcing equipment (PSE) and pre-standard (legacy) PSEs that do not comply with the standard's inrush current limits.
The Si3400 has been designed to deliver features beyond the IEEE 802 standard's base requirements. For example, with direct access to the line-side voltages from the Ethernet cable, the integrated diode bridges enable a proprietary early power loss indicator, which provides adequate time to save operating and status information before safely shutting down the powered device. The diode bridges also allow a direct connection to the RJ-45 connector, which minimizes the PCB trace lengths between the connector and the Si3400 and thus reduces EMI. In addition, the integrated transient suppressor activates protection circuitry when high voltages are detected, improving overall device robustness and reliability.
Click here for the product datasheet. Pricing for the Si3400 begins at $2.48 each in quantities of 10k. It's packaged in a lead-free RoHS compliant, 5-by-5 mm, 20-pin QFN. Samples are available now, and production is scheduled for Q3. An engineering evaluation board (Si3400-EVB) is also available; a complete Ethernet system evaluation kit will be available in August.
Silicon Labs, 1-512-416-8500, www.silabs.com