STEVAL-POE001V1

STEVAL-POE001V1 is a Power Over Ethernet (PoE) - IEEE 802.3bt compliant interface reference design. This reference design integrates a high power standard PoE-PD interface compliant with the third generation IEEE 802.3bt PoE standard, able to support applications up to 100W. The PoE-PD interface is based on the PM8805 system in package featuring two embedded active bridges with driving circuitry, a charge pump to drive the high side MOSFETs, a hot swap MOSFET and a standard single-signature interface compliant with IEEE 802.3bt, including detection, classification, UVLO and inrush current limitation. The PM8805 is suitable for building the interface for PoE switch mode power supplies for maximum conversion efficiency, with a PGD signal that can be used to enable downstream DC-DC converters or LED drivers with suitable electrical parameters.

• System in package with dual active bridge, hot swap MOSFET and PoE-PD interface
• 100V N-channel MOSFETs with 0.2ohm total path resistance
• 100V, 0.1ohm high side hot swap MOSFET
• PoE-PD single-signature interface compliant with IEEE 802.3bt
• Detection and support of high power 4-pair applications
• Programmable classification current with 3.3ms delay
• Advanced energy-saving MPS timings
• Two step hot swap current protection: DC with 1ms delay and overload with 10µs delay
• Startup phase (pre-charge of output capacitor), performed using an internally limited current source
• PGD signal (open drain) to enable an external PWM controller and thermal shutdown protection