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PoE controller that can simultaneously provide 10Gbps and 71.3W power supply with a single cable
The "LTC4291/LTC4292" chipset is a PoE controller provided by Analog Devices. PoE stands for Power Over Ethernet, and it is possible to supply power via Ethernet.
Applications that previously required two cables: a power cable and a LAN cable.
- Surveillance camera
- IP phone
- Measuring equipment
- network equipment
You can combine communication and power in one LAN cable for applications such as
The LTC4292/LTC4291 chipset also supports 4 ports compliant with 802.3af, 802.3at and 802.3bt. Therefore, it is possible to supply power to multiple LAN cables at the same time.
This article discusses the following features of the LTC4292/LTC4291:
- Power supply of up to 71.3W with a single LAN cable
- Backward compatible, can coexist with legacy PoE
- The amount of heat to be worried about is the lowest level in the industry.
- Temperature range from -40 to 85°C, can be used for industrial applications
- 周辺部品は最小限、だから低コストを実現
1. Supply power of up to 71.3W with a single LAN cable
The LTC4292/LTC4291 can deliver up to 71.3W with a single LAN cable.
Therefore, conventional PoE (12.95W to maximum 25.5W) could only supply power to surveillance cameras and wireless access points, but it can also supply power to industrial equipment, measurement equipment, network equipment, etc.
The LTC4292/LTC4291 supports PoE++.
| class | PSE (power supply) | PD (power receiving) | Standard |
| 0 | 15.4W | 13.0W | IEEE802.3af |
| 1 | 4.0W | 3.84W | IEEE802.3af |
| 2 | 7.0W | 6.49W | IEEE802.3af |
| 3 | 15.4W | 12.95W | IEEE802.3af |
| 4 | 30.0W | 25.5W | IEEE802.3at (PoE+) |
| - | 90.0W | 71.4W | PoE++ |
2. Backward compatibility allows coexistence with traditional PoE
The LTC4292/LTC4291 support the existing existing PoE standards IEEE802.3af, IEEE802.3at.
Therefore, coexistence is possible even within a network with the existing PoE standard.
3. Achieves the lowest level of heat generation in the industry
Conventional switching hubs did not have many heat generation problems, but as PoE has been introduced in recent years, heat generation has become a major problem.
In particular, PoE++ can supply large currents, so it is important to deal with heat generation.
However, the LTC4292/LTC4291 utilizes low ON-resistance external MOSFETs and 0.15Ω shunt resistors for each power channel to achieve the industry's lowest heat dissipation.
4. Temperature range is -40~85℃, can be used for industrial applications
The LTC4291/LTC4292 has an operating temperature range of -40°C to 85°C. Therefore, it can be used safely in industrial equipment.
5. 周辺部品は最小限、だから低コストを実現
Traditional PoE designs require up to six optocouplers and a complex isolated 3.3V power supply. However, the LTC4291/LTC4292 can communicate with each other over a low cost Ethernet transformer.
Therefore, it is possible to significantly reduce peripheral separation costs and improve reliability.
Demonstration video of PoE evaluation kit
The PoE functions introduced so far will be explained in an easy-to-understand manner using a video that actually operates using the demo board.
"DC2685B" evaluation kit for immediate evaluation
The DC2685B evaluation kit is available for immediate evaluation of the LTC4291/LTC4292.
DC2685B consists of DC2684A-B (daughter card) and DC2683A (motherboard).
The DC2685B evaluation kit allows you to start evaluation immediately by connecting a LAN cable to your PC, DC2683A motherboard, daughter card, and RJ45 port.
It is possible to connect to up to 4 RJ45 ports for evaluation.
Application example
- Industrial equipment and measuring equipment
- Network equipment (server equipment)
- IP camera
- PoE-enabled home appliances
Product Summary
| Type name | LTC4291/LTC4292 |
| specification |
|
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