MAX5984DETI+

Overview

The MAX5984DETI+ is a single-port Power Sourcing Equipment (PSE) controller designed for IEEE 802.3af and 802.3at compliant applications. It integrates a high-side switch with an internal MOSFET having an on-resistance of 0.5Ω. The device supports up to 40W of power delivery. It operates within an input voltage range of 3V to 3.6V and provides an output current capability of 4mA for control functions. Packaged in a 28-pin TQFN with an exposed pad, it facilitates compact PoE++ infrastructure design.

Feature Summary

• Integrates a high-side switch with a 0.5Ω internal MOSFET for efficient power delivery
• Supports IEEE 802.3af and 802.3at standards for single-port PSE applications
• Enables up to 40W power classification for connected powered devices

Applications

• IEEE 802.3af/at compliant Power over Ethernet switches
• Midspan PoE injectors supporting Class 4 devices
• PoE++ infrastructure controllers requiring integrated switching

Procurement Notes

Verify the specific suffix 'DETI+' against the manufacturer's official documentation to confirm package type and lead-free status. Confirm availability as this component may be listed as obsolete or end-of-life by Analog Devices/Maxim Integrated. Ensure compatibility with existing PCB footprints for the 28-TQFN package before procurement.

Selection Notes

Select this component for designs requiring a single-channel PSE solution that meets IEEE 802.3af/at standards. The integrated MOSFET reduces external component count compared to discrete solutions. Consider the 28-TQFN package constraints and thermal requirements associated with the exposed pad design when evaluating board layout options.

Part Context

The MAX5984 series belongs to Maxim Integrated's portfolio of Power over Ethernet controllers. This specific part is engineered for midspan and inline power sourcing equipment. It simplifies system design by combining control logic with power switching capabilities in a single IC, targeting cost-sensitive and space-constrained networking hardware.

Replacement Considerations

Public sources indicate the MAX5984DETI+ is obsolete. Verify alternative packages or next-generation replacements directly from Analog Devices/Maxim Integrated documentation. Do not assume functional equivalence with other PoE controllers without cross-referencing pinouts and electrical specifications.