INDUSTRY'S FIRST FULLY INTEGRATED IEEE802.3af-COMPLIANT POWER-OVER-ETHERNET POWER-SUPPLY ICs
SUNNYVALE, CA-December 10, 2003-Maxim Integrated Products
(NASDAQ: MXIM) introduces the MAX5941/MAX5942, the industry's first power-over-Ethernet (PoE) DC-DC controllers that integrate an interface controller for powered devices such as IP phones, wireless LAN access point, and IP cameras. These ICs provide regulated power to a device's system and allow it to be safely powered over the network category-5 (CAT-5) data cable.
Rated for up to +67V operation and over 15W output power, the MAX5941/MAX5942 are fully compliant to the IEEE802.3af standard and allow design of isolated or nonisolated power supplies. Each device provides a valid 25k signature discovery, classification signature, and programmable inrush current. During detection, these devices draw less than the 10µA of offset current, allowing accurate detection of the 25k signature.
The MAX5941/MAX5942 include a current-mode PWM controller with an integrated startup circuit suitable for the high-performance, isolated or non-isolated power supplies. Other features include current-mode control, leading-edge blanking, soft-start, overcurrent shutdown, undervoltage lockout, and thermal shutdown.
The MAX5941 is recommended for isolated forward and flyback converters. The MAX5942 is recommended for nonisolated designs.
The MAX5941/MAX5942 are available in the extended
(-40°C to +85°C) and commercial (0°C to +70°C) temperature ranges in the surface-mount, 16-pin SO package. Prices start at $1.96 for the MAX5941 and $2.07 for the MAX5942 (1000-up, FOB USA).
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