LTC4274AIUHF-4#PBF

LINEAR TECHNOLOGY  LTC4274AIUHF-4#PBF  芯片, 供电控制器, 90W, 1MHZ, 38QFN

The is a single Power Sourcing Equipment PSE Controller capable of delivering up to 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. The LTC4274A feature set is a superset of the popular LTC4274. This PSE controller features low-RON external MOSFETs and 0.25R sense resistors which are especially important at the LTPoE++ current levels to maintain the lowest possible heat dissipation. This power management features include: a 14-bit current monitoring ADC, DAC-programmable current limit and versatile quick port shutdown. PD Discovery uses a proprietary dual-mode 4-point detection mechanism ensuring excellent immunity from false PD detection. The LTC4274A includes an I²C serial interface operable up to 1MHz.

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Low power dissipation

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0.25R Sense resistance per channel

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Very high reliability 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 2-pair and 4-pair output power