Linear Technology has introduced the LTC4270/ LTC4271 isolated 12-port power source equipment (PSE) controller chipset designed for use in IEEE 802.3at (PoE+) Type 1 and Type 2 compliant Power over Ethernet (PoE) systems.
The LTC4271 provides a digital interface to the PSE host, while the LTC4270 provides the high-voltage Ethernet interface; the two ICs are then bridged by inexpensive Ethernet transformers. The transformer-isolated communication protocol replaces up to six optocouplers and a complex isolated 3,3 V supply used in traditional designs.
The LTC4270/LTC4271 is suitable for a wide variety of PSE applications, including next-generation switches, routers, hubs and midspans. Designers can take advantage of the robustness provided by 80 V port pins and low power dissipation, easing thermal design. Powered device (PD) discovery is accomplished using a proprietary dual-mode, four-point detection mechanism that ensures immunity from false PD detection.
Advanced power management includes prioritised fast shutdown, 14-bit per port voltage and current readback, 8-bit programmable current limits and 7-bit programmable overload current limits, and field upgradeable firmware. A 1 MHz I²C interface allows a host controller to digitally configure the IC or query port readings. C libraries are available to ease engineering efforts.
The LTC4270 is available in three power grades: A-grade uses Linear’s LTPoE++ signalling to support up to 90 W PDs, B-Grade uses PoE+ signalling to support up to 25,5W PDs, and C-grade uses PoE signalling to support up to 13 W PDs. The chipset is offered in industrial temperature grades.
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