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LT4321

Linear Technology
Part Number LT4321
Manufacturer Linear Technology
Description PoE Ideal Diode Bridge Controller
Published Jul 29, 2014
Detailed Description LT4321 PoE Ideal Diode Bridge Controller Features n n n n Description The LT®4321 is a dual ideal diode bridge con...
Datasheet PDF File LT4321 PDF File

LT4321
LT4321

Overview
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.
Unlike discrete ideal bridge solutions, the LT4321 will operate through transients without enabling the MOSFETs on unpowered pairs.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PowerPath and LTPoE++...


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