70 W single-channel PD controller for PoE+ designs
The MAX5982AETE+T is a single-channel Powered Device (PD) controller compliant with both 802.3at (PoE+) and 802.3af (PoE) standards, rated for up to 70 W maximum power delivery. It integrates the internal switching MOSFET and supports an auxiliary sense input, enabling designs that draw power from the Ethernet cable while also accepting an external supply for higher system loads. The 70 W ceiling positions this part for applications that exceed the 25.5 W Type 2 limit — think pan-tilt-zoom cameras, wireless access points with multiple radios, or LED lighting fixtures that need full PoE+ budget.
Supply range, quiescent draw, and temperature grade
Operating from 36.6 V to 60 V, the MAX5982AETE+T covers the full PoE bus voltage range including the 57 V max from a PSE after cable drop — no external pre-regulator needed. Quiescent supply current is 250 µA typical, a figure that matters for standby power budgets in always-on equipment where every milliwatt counts toward the total PD power allocation.
Package, footprint, and assembly considerations
Housed in a 16-WQFN with exposed pad (also specified as 16-TQFN 5x5 mm), the package requires a thermal land on the PCB to sink heat from the internal switch — the datasheet's recommended footprint keeps the thermal resistance below 40°C/W with proper via stitching. Supplied in tape and reel (also available as cut tape), the part is pick-and-place ready for volume assembly; the exposed pad demands a solder paste stencil aperture that covers 50-70% of the pad area to avoid voiding.
Active lifecycle and regulatory compliance
ROHS3 compliant per the manufacturer's declaration, clearing European and global regulatory requirements for lead-free assembly.