PSE Controller 28-Pin TQFN EP

The MAX5971A is a single-port, power-sourcing equipment (PSE) power controller designed for use in IEEE 802.3af/at-compliant PSE. This device provides powered device (PD) discovery, classification, current limit, DC and AC load-disconnect detections. The MAX5971A operates automatically without the need for any software programming and features an integrated power MOSFET and sense resistor. The device also supports new Class 5 and 2-event classification for detection and classification of high-power PDs. The MAX5971A provides up to 40W to a single port (Class 5 enabled) and still provides high-capacitance detection for legacy PDs. The MAX5971A provides input undervoltage lockout (UVLO), input overvoltage lockout, overtemperature detection, output voltage slew-rate limit during startup, and LED status indication. The MAX5971A is available in a space-saving, 28-pin TQFN (5mm x 5mm) power package, and is rated for the extended (-40°C to +85°C) temperature range.

• IEEE 802.3af/at Compliant
• Up to 40W for Single-Port PSE Applications
• Integrated 0.5O Power MOSFET and Sense Resistor
• PD Detection and Classification
• Programmable Current Limit for Class 5 PDs
• High-Capacitance Detection for Legacy Devices
• Supports Both DC and AC Load Removal Detections
• Current Foldback and Duty Cycle-Controlled Current Limit
• LED Indicator for Port Status
• Direct Fast-Shutdown Control Capability
• Space-Saving, 28-Pin TQFN (5mm x 5mm) Package