The MAX5952 is a quad -48V power controller designed for use in IEEETM 802.3af-compliant/pre-IEEE 802.3at-compatible power-sourcing equipment (PSE). This device provides powered device (PD) discovery, classification, current limit, DC and AC load disconnect detections in compliance with the IEEE 802.3af standard. The MAX5952 is pin compatible with MAX5945/ LTC4258/LTC4259A PSE controllers and provides additional features. The MAX5952 features high-power mode that provides up to 45W per port. The MAX5952 provides instantaneous readout of each port current through the I2C interface. The MAX5952 also provides high-capacitance detection for legacy PDs.