LT®4276 是一个引脚对引脚兼容的 IEEE 802.3 和 LTPoE++ 受电设备 (PD) 控制器系列。该器件包括一个能够在正激式和反激式拓扑中执行同步操作的隔离式开关稳压控制器,并具有辅助电源支持能力。
LT4276A 采用 LTPoE++ 分级方案,可在 PD RJ45 连接器上接收 38.7W、52.7W、70W 或 90W 的功率,并返回兼容 IEEE 802.3 标准。LT4276B 是一款完全符合 IEEE 802.3at 25.5W Type 2 (PoE+) 规格的 PD。LT4276C 则是一款完全符合 IEEE 802.3af 13W Type 1 (PoE) 规格的 PD。
LT4276 支持正激式和反激式电源拓扑,可针对众多的 PoE 应用进行配置。反激式拓扑支持 No-Opto 反馈。只需采用一个连接至 AUX 引脚的电阻分压器即可准确地检测辅助输入电压。
LT4276 利用一个外部低 RDS(ON) N 沟道 MOSFET 以实现热插拔功能,从而最大限度地提高了供电能力和效率、降低了热耗散、并且简化了热设计。
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) * |
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LT4276AHUFD#PBF | 4x5 QFN-28 | H | $5.31 | $3.72 |
LT4276AHUFD#TRPBF | 4x5 QFN-28 | H | $5.37 | $3.78 |
LT4276AIUFD#PBF | 4x5 QFN-28 | I | $4.43 | $3.10 |
LT4276AIUFD#TRPBF | 4x5 QFN-28 | I | $4.49 | $3.16 |
LT4276BHUFD#PBF | 4x5 QFN-28 | H | $4.46 | $3.12 |
LT4276BHUFD#TRPBF | 4x5 QFN-28 | H | $4.52 | $3.18 |
LT4276BIUFD#PBF | 4x5 QFN-28 | I | $3.71 | $2.60 |
LT4276BIUFD#TRPBF | 4x5 QFN-28 | I | $3.77 | $2.66 |
LT4276CHUFD#PBF | 4x5 QFN-28 | H | $3.60 | $2.52 |
LT4276CHUFD#TRPBF | 4x5 QFN-28 | H | $3.66 | $2.58 |
LT4276CIUFD#PBF | 4x5 QFN-28 | I | $3.21 | $2.25 |
LT4276CIUFD#TRPBF | 4x5 QFN-28 | I | $3.27 | $2.31 |
器件型号 | 描述 | 价格 |
---|---|---|
DC2046A-A | LT4276B/LT4321 Demo Board | PoE+ (25W, 3.3V/6.8A) PD with DC/DC and Ideal Diode Bridge | $95.00 |
DC2046A-B | LT4276B/LT4321 Demo Board | PoE+ (25W, 5V/4.7A) PD with DC/DC and Ideal Diode Bridge | $95.00 |
DC2046A-C | LT4276B/LT4321 Demo Board | PoE+ (25W, 12V/1.9A) PD with DC/DC and Ideal Diode Bridge | $95.00 |
DC2046A-D | LT4276B/LT4321 Demo Board | PoE+(25W, 24V/1A) PD with DC/DC and Ideal Diode Bridge | $95.00 |
DC2046A-E | LT4276A/LT4321 Demo Board | LTPoE++ (38.7W, 5V/7A) PD with DC/DC and Ideal Diode Bridge | $95.00 |
DC2046A-F | LT4276C/LT4321 Demo Board | PoE (13W, 5V/2.3A) PD with DC/DC and Ideal Diode Bridge | $95.00 |
DC2047A-A | LT4276B/LT4321 Demo Board | PoE+ (25W, 12V/1.9A) PD with DC/DC, Ideal Diode Bridge and 9V-57V AUX | $95.00 |
DC2262A-A | LT4276A/LT4321 Demo Board | LTPoE++ (70W, 5V/13A) PD with DC/DC and Ideal Diode Bridge | $95.00 |
DC2262A-B | LT4276A/LT4321 Demo Board | LTPoE++ (90W, 12V/7A) PD with DC/DC and Ideal Diode Bridge | $95.00 |
器件型号 | 描述 | 价格 |
---|---|---|
DC1814A-A | LTC4274A-1 Demo Board | LTPoE++ (38.7W) PSE | $100.00 |
DC1815A-A | LTC4266A-1 Demo Board | 4-Port 38.7W LTPoE++ PSE (req. DC590) | $200.00 |