LT4321HUF#PBF

LINEAR TECHNOLOGY  LT4321HUF#PBF  芯片, 二极管桥接控制器, QFN-16

The is a dual Ideal Diode Bridge Controller that enables a power over Ethernet PoE powered device PD to receive power in either voltage polarity from RJ-45 data pairs, spare pairs or both. The LT4321 and eight N-channel MOSFETs replace the eight diodes in a passive PoE rectifier bridge. The LT4321 eases thermal design and increases delivered power. An internal charge pump allows an all-NMOS bridge eliminating larger and more costly PMOS switches. High impedance input sense pins prevent reverse current on unused pairs. If the power source fails or is shorted, a fast turn-OFF minimizes reverse current transients. Unlike discrete ideal bridge solutions, the LT4321 will operate through transients without enabling the MOSFETs on unpowered pairs.

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Reduces heat, eliminates thermal design problems

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Maximizes power efficiency

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Less than 800µA quiescent operating current

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Fully compatible with IEEE 802.3 detection and classification

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IEEE 802.3 compliant when paired with a Powered Device PD controller

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Works with 2-pair and 4-pair PoE applications

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Compatible with PoE, PoE+ and LTPoE++™

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Green product and no Sb/Br