LT4321 - PoE 理想二极管桥控制器

LT®4321 是一款双路理想二极管桥控制器，其可使一部以太网供电 (PoE) 受电设备 (PD) 从 RJ-45 数据线对和/或空闲线对接收任一电压极性的电源。LT4321 和 8 个 N 沟道 MOSFET 可替代一个无源 PoE 整流器桥中的 8 个二极管。LT4321 简化了热设计并可增加输送功率。

一个内部充电泵可实现一个全 NMOS 桥，从而免除了体积更大且更加昂贵的 PMOS 开关。LT4321 适合于两对线和四对线应用。高阻抗输入检测引脚可防止在未用线对上出现反向电流。如果电源发生故障或短路，则快速关断以最大限度地抑制反向电流瞬变。与分立式理想二极管桥解决方案不同，LT4321 将在整个瞬变过程中正常运作，而无需使能未通电线对上的 MOSFET。

特点
  • 减少热量，消除热设计问题
  • 最大限度地提高电源效率
  • 低于 800μA 的静态工作电流
  • 可完全兼容 IEEE 802.3 检测和分级标准
  • 当与一个受电设备 (PD) 控制器配对使用时符合 IEEE 802.3 标准
  • 适合两对线和四对线 PoE 应用
  • 可兼容 PoE、PoE+ 和 LTPoE++™
  • 100V 绝对最大电压
  • H 级版本可运作至高达 125ºC
  • 16 引脚 4mm x 4mm QFN 封装
典型应用
LT4321 Typical Application
应用
  • PoE / PoE+ / LTPoE++ 受电设备
  • 电信电源的 DC 极性校正和理想二极管 “或”
封装信息
LT4321 Package Drawing
Order Information 订购型号
器件型号封装温度价格 (以 1 ~ 99 片为批量)价格 (以 1000 片为批量) *
LT4321HUF#PBF4x4 QFN-16H$4.85$3.39
LT4321HUF#TRPBF4x4 QFN-16H$3.45
LT4321IUF#PBF4x4 QFN-16I$4.21$2.95
LT4321IUF#TRPBF4x4 QFN-16I$3.01
演示电路板
器件型号描述价格
DC2046A-ALT4276B/LT4321 Demo Board | PoE+ (25W, 3.3V/6.8A) PD with DC/DC and Ideal Diode Bridge$95.00
DC2046A-BLT4276B/LT4321 Demo Board | PoE+ (25W, 5V/4.7A) PD with DC/DC and Ideal Diode Bridge$95.00
DC2046A-CLT4276B/LT4321 Demo Board | PoE+ (25W, 12V/1.9A) PD with DC/DC and Ideal Diode Bridge$95.00
DC2046A-DLT4276B/LT4321 Demo Board | PoE+(25W, 24V/1A) PD with DC/DC and Ideal Diode Bridge$95.00
DC2046A-ELT4276A/LT4321 Demo Board | LTPoE++ (38.7W, 5V/7A) PD with DC/DC and Ideal Diode Bridge$95.00
DC2046A-FLT4276C/LT4321 Demo Board | PoE (13W, 5V/2.3A) PD with DC/DC and Ideal Diode Bridge$95.00
DC2047A-ALT4276B/LT4321 Demo Board | PoE+ (25W, 12V/1.9A) PD with DC/DC, Ideal Diode Bridge and 9V-57V AUX$95.00
DC2093A-ALT4275A/LT4321 LTPoE++/PoE+/PoE PD Demo Board$95.00
DC2093A-BLT4275B/LT4321 PoE+/PoE PD Demo Board$95.00
DC2093A-CLT4275C/LT4321 PoE PD Demo Board$95.00
DC2125ALT4275/LT4321/LTM8027 Demo Board | LTPoE++ PD Plus Diode Bridge & DC/DC Controller$125.00
DC2475A-ALT4295/LT4321 Demo Board | PoE++ (40W, 12V/3A) PD with Flyback DC/DC and Ideal Diode Bridge$95.00
DC2476A-ALT4295/LT4321 Demo Board | PoE++ (62W/24V/2.7A or 71W/24V/2.4A) PD with Flyback DC/DC and Ideal Diode Bridge$95.00
DC2539A-ALT4295/LT4321 Demo Board | PoE++ (51W, 12V/3.9A) PD with Flyback DC/DC and Ideal Diode Bridge$95.00
Companion Boards
器件型号描述价格
DC1814A-ALTC4274A-1 Demo Board | LTPoE++ (38.7W) PSE$100.00
DC1815A-ALTC4266A-1 Demo Board | 4-Port 38.7W LTPoE++ PSE (req. DC590)$200.00
DC1814A-BLTC4274A-2 Demo Board | LTPoE++ (52.7W) PSE$100.00
DC1814A-CLTC4274A-3 Demo Board | LTPoE++ (70W) PSE$100.00
DC1814A-DLTC4274A-4 Demo Board | LTPoE++ (90W) PSE$100.00
DC1815A-BLTC4266A-2 Demo Board | 4-Port 52.7W LTPoE++ PSE (req. DC590)$200.00
DC1815A-CLTC4266A-3 Demo Board | 4-Port 70W LTPoE++ PSE (req. DC590)$200.00
DC1815A-DLTC4266A-4 Demo Board | 4-Port 90W LTPoE++ PSE (req. DC590)$200.00
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