INDUSTRY'S FIRST IEEE802.3af-COMPLIANT POWER-DEVICE INTERFACE CONTROLLERS WITH ADJUSTABLE UNDERVOLTAGE LOCKOUT
SUNNYVALE, CA-November 11, 2003-Maxim Integrated Products (NASDAQ: MXIM) introduces the MAX5940A/MAX5940B, interface controllers that meet the powered device (PD) requirements of IEEE802.3af-compliant Power-over-Ethernet (LAN) systems. These ICs are ideal for power devices such as IP phones, wireless LAN access point, and IP cameras. The MAX5940A/MAX5940B allow these power detectors to be safely powered over the network category-5 (CAT-5) cable.
Rated for up to +67V operation, the MAX5940A/MAX5940B are fully compliant to the IEEE802.3af standard and are compatible with legacy power-sourcing equipment (PSE). They provide a valid 25kΩ signature discovery and classification signature. Programmable inrush current-limit control gives these PDs the flexibility to consume more power than the maximum 13W allocated by the IEEE802.3af standard. During detection, both devices draw less than the 10µA of offset current, allowing accurate detection of the 25kΩ signature. An internal 0.6Ω N-channel MOSFET provides isolation during detection, inrush-current control, and efficient power-mode operation.
The MAX5940A is available with a default undervoltage lockout and asserted high (PGOOD) output, while the MAX5940B is available with adjustable undervoltage lockout and choice of (PGOOD) and (PGOOD-bar) outputs to enable downstream converters. Both devices include an undervoltage-lockout deglitch filter to allow for rugged operation.
The MAX5940A/MAX5940B are available in the extended temperature range (-40°C to +85°C) in a surface-mount 8-pin SO package. Prices start at $0.93 for the MAX5940A and $1.04 for the MAX5940B (1000-up, FOB USA).
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