MAX5991AETP+

Overview

The MAX5991AETP+ is a single-channel Power Over Ethernet (PoE) controller compliant with IEEE 802.3af standards. It manages power delivery for Class 0 and Class 1 devices within an input voltage range of 8.7V to 60V. The device integrates a high-efficiency synchronous buck converter, current limit protection, and thermal shutdown. Packaged in a 20-pin TQFN-EP (4x4mm) exposed pad format, it operates across a temperature range of -40°C to +85°C. Key features include programmable current limiting, output voltage regulation, and status reporting via open-drain pins.

Feature Summary

• IEEE 802.3af PoE compliance for reliable power sourcing equipment integration
• Integrated high-efficiency synchronous buck converter for direct load powering
• Comprehensive protection mechanisms including current limit and thermal shutdown
• Open-drain status outputs for system monitoring and fault indication

Applications

• Industrial networking equipment requiring PoE power sourcing
• Commercial access points and wireless LAN infrastructure
• IP-based surveillance cameras and video conferencing systems
• IoT edge devices powered via Ethernet cabling

Procurement Notes

Verify the specific suffix 'ETP+' against the official Analog Devices datasheet to confirm package type and RoHS compliance. Ensure the design supports the required input voltage range of 8.7V to 60V. Confirm availability through authorized distributors as supply levels may vary. Cross-reference pinouts with the latest documentation to ensure PCB layout compatibility.

Selection Notes

Select this component when designing single-channel PoE systems adhering to the 802.3af standard. It is suitable for applications requiring integrated power conversion without external MOSFETs. Consider the 20-TQFN package constraints for thermal management. Evaluate the need for Class 0 or Class 1 power classification support before finalizing the bill of materials.

Part Context

Part of the Maxim Integrated MAX5991 family of PoE controllers. Designed to simplify power sourcing equipment designs by integrating control logic and power stages. Manufactured by Analog Devices Inc. following the acquisition of Maxim Integrated. Commonly used in embedded networking solutions where space efficiency and regulatory compliance are critical.

Replacement Considerations

Check for MAX5991 variants with different suffixes for package or temperature changes. Verify if newer IEEE 802.3at (PoE+) or 802.3bt controllers are needed for higher power requirements. Consult Analog Devices for direct pin-to-pin replacements within the same series.