LTC4266 Datasheet | Linear Technology

Features nn Four Independent PSE Channels nn pliant with IEEE 802.3at Type 1 and 2 nn 0.34Ω Total Channel Resistance nn 130m W/Port at 600m A nn Advanced Power Management nn 8-Bit Programmable Current Limit (ILIM) nn 7-Bit Programmable Overload Currents (ICUT) nn Fast Shutdown of Preselected Ports nn 14.5-Bit Port Current/Voltage Monitoring nn 2-Event Classification nn Very High Reliability 4-Point PD Detection nn 2-Point Forced Voltage nn 2-Point Forced Current nn High Capacitance Legacy Device Detection nn LTC4259A-1 and LTC4258 Pin and SW patible nn 1MHz I2C patible Serial Control Interface nn Midspan Backoff Timer nn Supports Proprietary Power Levels Above 25W nn Available in 38-Pin 5mm × 7mm QFN and 36-Pin SSOP Packages Applications nn High Power PSE Switches/Routers nn High Power PSE Midspans L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Thin SOT is a trademark of Analog Devices, Inc. All other trademarks are the property of their respective owners. Quad IEEE 802.3at Power over Ethernet Controller Description The LTC®4266 is a quad PSE controller designed for use in IEEE 802.3 Type 1 and Type 2 (high power) pliant 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 ponents also allow use at very high power levels while remaining otherwise patible with the IEEE standard. 80V-rated port pins provide robust protection against external faults. The LTC4266 includes advanced power management Features , including current and voltage readback and programmable ICUT and ILIM thresholds. Available C libraries simplify power-management software development; an optional AUTO pin mode provides fully IEEEpliant standalone operation with no software required. Proprietary 4-point PD detection circuitry minimizes false PD detection while...