LT4321HUF#PBF - 

Ideal Diode Controller, 20 V to 80 V in, QFN-16

LT4321HUF#PBF - Ideal Diode Controller, 20 V to 80 V in, QFN-16

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Product Overview

The LT4321HUF#PBF 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.
  • Reduces heat, eliminates thermal design problems
  • Maximizes power efficiency
  • Less than 800µA quiescent operating current
  • Fully compatible with IEEE 802.3 detection and classification
  • IEEE 802.3 compliant when paired with a Powered Device (PD) controller
  • Works with 2-pair and 4-pair PoE applications
  • Compatible with PoE, PoE+ and LTPoE++™
  • Green product and no Sb/Br


Communications & Networking, Signal Processing, Power Management

Product Information

Ideal Diode Controller
MSL 1 - Unlimited
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