LTC4274AIUHF-4#PBF

LTC4274A is a single power sourcing equipment (PSE) controller capable of delivering upto 90W of LTPoE++ power to a compatible LTPoE++ Powered Device (PD). A proprietary detection/classification scheme allows mutual identification between a LTPoE++ PSE and LTPoE++ PD while remaining compatible and interoperable with existing type 1 (13W) and type 2 (25.5W) PDs. Its feature set is a superset of the popular LTC4274. This PSE controllers feature low-RON external MOSFETs and 0.25 ohm sense resistors which are especially important at the LTPoE++ current levels to maintain the lowest possible heat dissipation. Advanced power management features include a 14bit current monitoring ADC, DAC-programmable current limit, and versatile quick port shutdown. It is widely used in applications such as LTPoE++ PSE switches/routers, LTPoE++ PSE midspans, IEEE 802.3at type 1 PSE switches/routers, IEEE 802.3at type 1 PSE midspans etc.

• Very high reliability 4-point PD detection
• 2-point forced voltage, 2-point forced current
• High capacitance legacy device detection
• 1MHz I²C compatible serial control interface
• Midspan backoff timer, supports 2-pair and 4-pair output power
• Max power is 90W
• VDD supply voltage is 3.3V typ at (TA = 25°C, AGND – VEE = 54V)
• VDD supply current is 1.1mA typ at (TA = 25°C, AGND – VEE = 54V)
• Operating temperature range from -40°C to 85°C
• Package style is 38-lead plastic QFN

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