MAX5991BETP+T

Overview

The MAX5991BETP+T is a Power Over Ethernet (PoE) controller designed for IEEE 802.3af compliant applications. It functions as a Powered Device (PD) controller, integrating DC/DC conversion capabilities with internal switches. The device supports a maximum power output of 6.49 W and includes auxiliary sensing features for enhanced monitoring. Packaged in a 20-TQFN (4x4 mm) exposed pad format, it facilitates efficient power delivery over Ethernet cabling while maintaining compliance with standard networking protocols.

Feature Summary

• IEEE 802.3af compliant PoE controller architecture
• Integrated DC/DC converter with internal switches
• Auxiliary sensing capability for system monitoring

Applications

• Powered Device implementations in network infrastructure
• IP camera and VoIP phone power management
• Wireless access point power distribution systems

Procurement Notes

Verify the specific suffix 'B' against the official datasheet to confirm voltage thresholds or feature sets, as ordering suffixes may denote functional variations. Confirm RoHS compliance status through manufacturer documentation. Ensure the 20-TQFN package footprint matches your PCB design requirements before finalizing procurement orders.

Selection Notes

Select this component for designs requiring strict adherence to IEEE 802.3af standards with integrated power switching. The internal switch configuration reduces external component count compared to discrete solutions. Evaluate the 6.49 W power limit against load requirements. The exposed pad package necessitates careful thermal management considerations during PCB layout.

Part Context

This part belongs to the Maxim Integrated PoE controller family, specifically targeting Powered Devices. It integrates control logic and power stage elements into a single compact solution. The series is designed to simplify network endpoint power integration by combining protocol handling with power conversion in a small form factor suitable for dense electronic assemblies.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Verify compatibility with existing design files if considering alternative PoE controllers from the same manufacturer family.