ADI LT4321HUF#TRPBF

桥式整流器N 通道

Overview

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.

Features

Tape & Reel (TR) Package
in a 16-WQFN Exposed Pad case
FET Type: N-Channel
16 terminations

Surface Mount Mounting Type

Applications

There are a lot of Linear Technology/Analog Devices
LT4321HUF#TRPBF Ideal Diode controller applications.

• Digital Radios
• MP3 Players
• Active OR-ing of Redundant (N+1) Power Supplies
• Automotive battery protection
• ADAS domain controller
• Camera ECU
• Head Unit
• USB HUBs
• Active ORing for redundant power
• Factory automation and control - PLC digital output modules