Sunnyvale, Calif.—Maxim Integrated Products' MAX5945 is a quad power-sourcing-equipment (PSE) controller for power-over-Ethernet (PoE) with extra flexibility. In addition to providing the PSE's usual discovery, classification, current limit, and DC and AC load disconnect detection functions for a powered device (PD), the fully compliant IEEE802.3af controller provides three features not available from competing devices, according to the company.
These include support of both midspan (power injector) and endpoint switch/router (LAN) PSE applications. A cadence-timing feature allows the MAX5945 to be used in midspan systems. Competing solutions, says Maxim, handle switch/router PSE applications only.
Secondly, the device contains a watchdog feature to allow system hardware to gracefully take over
control if the system software crashes. In addition, the product is specified for guaranteed operation over -40 to +85°C and the commercial (0 to +70°C)
range. Competitive devices provide only 0 to +70°C operation, according to Maxim.
The preliminary product datasheet is available at www.maxim-ic.com/MAX5945. The MAX5945 is packaged in a 36-pin SSOP package. Prices start at $6.81 (1000-up, FOB USA). Samples are available. MAX5945 reference designs with software and design-in support and an evaluation kit are also available.
Maxim Integrated Products, 1-800-998-8800,