MAX5965A, MAX5965B High-performance, monolithic quad PSE controller enables IEEE 802.3at (PoE+) applications

The MAX5965 meets IEEE® 802.3at* and IEEE 802.3af standards, allowing multiport PoE systems to deliver up to 45W over standard Cat5 Ethernet cable to power IP phones, wireless LAN access nodes, and IP cameras. This quad PSE controller is pin and function compatible with the MAX5945/LTC4258/LTC4259A 802.33af quad PSE controllers, and offers additional features, allowing 802.3af PSE system upgrades for higher power* with minimal hardware changes.

SUNNYVALE, CA—August 10, 2009—Maxim Integrated Products (NASDAQ: MXIM) introduces the MAX5965, the industry's first monolithic quad PSE controller for IEEE 802.3at/PoE+ and IEEE 802.3af-compliant PoE applications. This device allows multiport PoE systems to deliver up to 45W over standard Cat5 Ethernet cable to power devices such as IP phones, wireless LAN access nodes, and IP cameras. The controller is well suited for both endpoint (LAN switches/routers) and midspan (power injectors) PSE applications. The MAX5965 is pin and function compatible with the MAX5945/LTC4258/LTC4259A 802.3af quad PSE controllers, plus has additional features, thus allowing customers to upgrade their 802.3af PSE systems for higher power* with minimal hardware changes.

Operating from 32V to 60V, the MAX5965 is rated for an absolute maximum of 80V. It provides 802.3af PD discovery and classification, and offers Class 5 and Class 6 classification for detection of high-power PDs. It also supports both DC and AC load-disconnect detection methods. The MAX5965's internal 9-bit ADC and I²C interface allows advanced power management and power budgeting in multiport PSE systems. To ensure interoperability, the MAX5965 is capable of detecting legacy (non-IEEE 802.3af compliant) PDs that use high capacitance as the discovery signature.

Numerous programming and configuration options give the MAX5965 unmatched design flexibility. This device can be controlled with a system microcontroller (such as the MAXQ2000), or it can be configured to operate autonomously. The MAX5965 can also be configured to operate in manual or semiautomatic modes, providing design flexibility as well as field debug and diagnostic capabilities. The gate-charging current, current-limit threshold, startup timeout, overcurrent timeout, and autorestart duty cycle are all programmable. Other features include: UVLO (undervoltage-lockout) detection and protection, a load-stability safety check during UVLO detection, overtemperature protection, output-voltage slew-rate limiting during startup, and power-good/fault-status indicators.

Maxim offers reference designs for both endpoint PSE or midspan PSE applications. The midspan reference designs can be configured to support up to 192 ports and include a MAXQ2000 microcontroller and supporting software. Contact the factory for more information.

The MAX5965 is offered in a 36-pin SSOP package and is rated to operate in the upper commercial temperature range (0°C to +85°C). Prices start at $4.54 (1000-up FOB USA); production samples are available.

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 6000 products serving the industrial, communications, consumer, and computing markets.