The MAX5922AEUI+ is a +48V, single port network power switch for power over LAN in 28 pin TSSOP package. Designed for power-sourcing equipment in power over LAN applications and is fully compliant to the IEEE 802.3af standard. It provides power devices (PD) discovery, classification, current limit and other necessary functions for an IEEE 802.3af compliant PSE. It is suitable for PSE function in both switch/router systems where the power is delivered to the load through signal pairs and in midspan systems where the power is delivered to the load through the spare pairs. In midspan mode, a detection collision avoidance circuit provides the necessary back-off timing to prevent fault detections that happen when two different PSEs try to detect and power the same PD. It features a programmable UVLO and is set to 38V internally. After successfully discovering and classifying a PD it enters start-up mode. During start-up, it limits the output voltage and current slew rate to minimize EMI.
- Supply voltage range is 32V to 60V
- Operating temperature range from -40°C to 85°C
- 0.45ohm integrated power switch
- 100μA PD leakage detection tolerant
- Programmable current limit, zero current detection with status output
- Input logic signals compatible with 1.8V to 5V CMOS logic
- Separate analogue and digital grounds with up to ±4V offset
- Overcurrent and overtemperature protection with status outputs
- Current limit foldback with timeout and duty cycle control
- Latch or autorestart fault management
通信与网络