LTC4266CGW#PBF

LINEAR TECHNOLOGY  LTC4266CGW#PBF  芯片, 控制器, 四路, 以太网供电, 3.3V, 36SSOP

The 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 heat-sinks 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. 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 IEEE-compliant standalone operation with no software required. Proprietary 4-point PD detection circuitry minimizes false PD detection while supporting legacy phone operation.

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Four independent PSE channels

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Compliant with IEEE 802.3 at type 1 and 2

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0.34R Total channel resistance

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8-bit Programmable current limit ILIM

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7-bit Programmable overload currents ICUT

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Fast shutdown of preselected ports

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14.5-bit Port current/voltage monitoring

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2-Event classification

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Very high reliability

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4-point PD detection

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2-point Forced voltage

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2-point Forced current

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High capacitance legacy device detection

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Midspan backoff timer

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Supports proprietary power levels above 25W