DESCRIPTION
●The LTC® 4266 is a quad PSE controller designed for use in IEEE 802.3 Type 1 and Type 2 (high power) compliant Power over Ethernet systems. External power MOSFETs enhance system reliability and minimize channel resistance, cutting power dissipation and eliminating the need for heatsinks even at Type 2 power levels. External power components also allow use at very high power levels while remaining otherwise compatible with the IEEE standard. 80V-rated port pins provide robust protection against external faults.
●FEATURES
●Four Independent PSE Channels
●Compliant with IEEE 802.3at Type 1 and 2
●0.34Ω Total Channel Resistance 130mW/Port at 600mA
●Advanced Power Management
● 8-Bit Programmable Current Limit (ILIM)
● 7-Bit Programmable Overload Currents (ICUT)
● Fast Shutdown of Preselected Ports
● 14.5-Bit Port Current/Voltage Monitoring
● 2-Event Classification
●Very High Reliability 4-Point PD Detection:
● 2-Point Forced Voltage
● 2-Point Forced Current
●High Capacitance Legacy Device Detection
●LTC4259A-1 and LTC4258 Pin and SW Compatible
●1MHz I2C Compatible Serial Control Interface
●Midspan Backoff Timer
●Supports Proprietary Power Levels Above 25W
●Available in 38-Pin 5mm × 7mm QFN and 36-Pin SSOP Packages
