Maxim PSE Controller Integrates Power MOSFET & Sense Resistor
Maxim Integrated Products introduced the MAX5971A single-port, power-sourcing equipment (PSE) controller for IEEE(R) 802.3af/at-compliant, high-power, power-over-Ethernet (PoE+) applications. According to the company, this device integrates a 0.5Ω power MOSFET and sense resistor to save space and cost, while delivering up to 40W/port for powered devices (PDs) such as IP phones, IP cameras, wireless LAN access points, and video surveillance cameras.
The MAX5971A is fully compliant with the IEEE 802.3af and IEEE 802.3at standards. The device operates from 32 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 MAX5971A is also capable of detecting legacy (noncompliant) PDs that use high capacitance as the discovery signature.
The MAX5971A operates autonomously without the need for host processor intervention or software, thus saving processor overhead. Other features include: input undervoltage-lockout (UVLO) detection, input overvoltage detection, an LED-status indicator, overtemperature protection, and output voltage slew-rate limiting during startup.
The MAX5971A is available in a 28-pin TQFN package, and is fully specified over the -40 to +85°C extended temperature range.
Prices start at $2.52 (1000-up FOB USA). Production samples and evaluation kits are available to speed designs.
