LTC4274IUHF#PBF

LTC4274 is a single power sourcing equipment 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. It includes advanced power management features, including current and voltage readback and programmable ICUT and ILIM thresholds. Available C libraries simplify software development; an optional AUTO pin mode provides fully IEEE-compliant standalone operation with no software required. It is used in applications such as PSE switches/routers, PSE midspans etc.

• 8bit programmable current limit (ILIM)
• 7bit programmable overload currents (ICUT
• Fast shutdown, 14.5bit port current/voltage monitoring
• 2-event classification, 2-point forced voltage, 2-point forced current
• High capacitance legacy device detection
• 1MHz I²C compatible serial control interface
• Midspan backoff timer, supports proprietary power levels above 25W
• VDD supply voltage is 3.3V typ at (TA = 25°C)
• VDD supply current is 1.1mA typ at (TA = 25°C)
• Operating temperature range from -40°C to 85°C, package style is 38-lead plastic QFN

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party