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The PM8805 is a system in package for Power over Ethernet (PoE) and powered devices (PD) applications. It embeds: two active bridges and their driving circuitry, a charge pump to drive high-side MOSFETs, the hot-swap MOSFET and the standard single-signature interface IEEE 802.3bt-compliant, including detection, classification, UVLO and inrush current limitation. The active bridges sustain up to 1 A current and the hot-swap MOSFET is designed to safely work up to 2 A. The device performs IEEE 802.3bt physical layer classification scheme, providing the system with an indication of successful PSE-type. The device identifies a 4-pair PSE, monitoring the pairs of the Ethernet cable and providing the system with a dedicated matrix of Tx signals. The device works with power either from the Ethernet cable or from an external power source such as a wall adapter, with the likelihood of the auxiliary source being prevalent over PoE. The device is suitable to build the interface section of PoE switch mode power supplies targeting the highest conversion efficiency. It provides a PGD signal that can be used to enable a PWM controller, a DC-DC converter or a LED driver.