Press Release Summary:
Supplied in 28-pin TQFN, MAX5971B single-port power-sourcing equipment (PSE) controller delivers up to 40 W/port for IEEEÂ® 802.3af/at-compliant, high-power power-over-Ethernet (PoE+) applications. It integrates 0.5 X power MOSFET, sense resistor, and current monitor, and typical application circuit requires fewer than 8 external components. Operating from 32-60 V, IC provides 9-bit ADC and IÂ²C interface as well as device discovery, classification, and DC/AC load-disconnect detection.
Original Press Release:
Highly Integrated IEEE 802.3af/at-Compliant PSE Controller Delivers up to 40W and Saves Space and Cost in PoE+ Powered Devices
PSE controller integrates power MOSFET, sense resistor, and current monitoring.
Maxim's new PSE controller integrates a power MOSFET, sense resistor, and current-monitoring capabilities to save space and cost in PSE systems.
SUNNYVALE, CA-Maxim Integrated Products (NASDAQ: MXIM) introduces the MAX5971B, a single-port power-sourcing equipment (PSE) controller for IEEE® 802.3af/at-compliant, high-power power-over-Ethernet (PoE+) applications. This device integrates a 0.5 W power MOSFET, sense resistor, and current monitor to save space and cost in PSE systems-the typical application circuit requires fewer than eight external components. Additionally, the MAX5971B includes a 9-bit ADC and I²C interface to enable advanced power management and power budgeting. Capable of delivering up to 40W/port for PoE+ powered devices (PDs), the MAX5971B is well suited for IP phones, IP cameras, wireless LAN access points, and video surveillance cameras.
This PSE controller is fully compliant to the IEEE 802.3af and IEEE 802.3at standards. The device operates from 32V to 60V and provides IEEE 802.3af/at-compliant PD discovery, classification, and DC/AC load-disconnect detection. Class 5 and two-event classification are supported for detection and classification of high-power PDs. The MAX5971B also detects legacy (noncompliant) PDs that use high capacitance as the discovery signature.
The device is fully software configurable through its I²C-compatible, 2-wire serial interface. The MAX5971B can be controlled with a system microcontroller (such as the MAXQ2000); it can be configured to operate autonomously without the need for a host microcontroller or software; or it can be configured to operate in manual or semiautomatic modes, which provide design flexibility as well as field debug and diagnostic capabilities.
Other device features include input undervoltage-lockout (UVLO) detection, input overvoltage detection, LED-status indication, overtemperature protection, and output voltage slew-rate limiting during startup.
Available for immediate design
Production samples and evaluation (EV) kits are available. The MAX5971B is packaged in a 28-pin TQFN and is rated to operate over the -40°C to +85°C extended temperature range. Price starts at $3.15 (1000-up FOB USA).
Maxim Integrated Products is a publicly traded company that designs, manufactures, and sells high-performance semiconductor products. The Company was founded over 25 years ago with the mission to deliver innovative analog and mixed-signal engineering solutions that add value to its customers' products. To date, it has developed over 6300 products serving the industrial, communications, consumer, and computing markets.
Maxim reported revenue in excess of $1.6 billion for fiscal 2009. A Fortune 1000 company, Maxim is included in the Nasdaq 100, the Russell 1000, and the MSCI USA indices. For more information, go to www.maxim-ic.com.
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Additional Information: MAX5971B