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LT4321 - PoE Ideal Diode Bridge Controller

Description

The LT®4321 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.

Features

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Datasheet preview – LT4321

Datasheet Details

Part number LT4321
Manufacturer Linear Technology
File Size 192.43 KB
Description PoE Ideal Diode Bridge Controller
Datasheet download datasheet LT4321 Datasheet
Additional preview pages of the LT4321 datasheet.

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Full PDF Text Transcription

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LT4321 PoE Ideal Diode Bridge Controller Features n n n n Description The LT®4321 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. The LT4321 works with 2-pair and 4-pair applications. 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.
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