| Part No.： | LT4321 |
| Page： | 14 Pages |
| Size： | 393 KB |
| Manufacturer： | Linear Technology |
| Logo： |  |
| Views： | 1 |
| Update Time： | 2023-12-14 14:56:20 |
| DataSheet： | Download |
| Part No. | Packing | SPQ | Marking | MSL | Pins | Temp Range | Package Description | Buy |
| LT4321IUF#PBF | Tube | 91 | 4321 | 1 | 16 | -40°C ~ 85°C | 16-Lead 4mm × 4mm Plastic QFN | |
| LT4321IUF#TRPBF | Reel | 2500 | 4321 | 1 | 16 | -40°C ~ 85°C | 16-Lead 4mm × 4mm Plastic QFN | |
| LT4321IUF#TRMPBF | Reel | 500 | 4321 | 1 | 16 | -40°C ~ 85°C | 16-Lead 4mm × 4mm Plastic QFN | |
| LT4321HUF#PBF | Tube | 91 | 4321 | 1 | 16 | -40°C ~ 125°C | 16-Lead 4mm × 4mm Plastic QFN | |
| LT4321HUF#TRPBF | Reel | 2500 | 4321 | 1 | 16 | -40°C ~ 125°C | 16-Lead 4mm × 4mm Plastic QFN | |
| LT4321HUF#TRMPBF | Reel | 500 | 4321 | 1 | 16 | -40°C ~ 125°C | 16-Lead 4mm × 4mm Plastic QFN |
The LT4321 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.
