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LTC4278IDKD

LTC4278IDKD

Product Overview

Category: Integrated Circuit (IC)

Use: Power over Ethernet (PoE) Controller

Characteristics: - Provides power and data to PoE-enabled devices - Supports IEEE 802.3af/at/bt standards - Enables power sourcing equipment (PSE) functionality - Offers advanced power management features

Package: DFN-16 (4mm x 3mm)

Essence: The LTC4278IDKD is a highly integrated PoE controller designed for use in various applications requiring power and data transmission over Ethernet cables.

Packaging/Quantity: The LTC4278IDKD is available in a DFN-16 package and is typically sold in reels of 2500 units.

Specifications

  • Input Voltage Range: 36V to 57V
  • Output Voltage Range: 2.7V to 14V
  • Maximum Output Current: 1.7A
  • Operating Temperature Range: -40°C to 85°C
  • Power Dissipation: 1.5W (typical)

Pin Configuration

The LTC4278IDKD features the following pin configuration:

| Pin Number | Pin Name | Description | |------------|----------|-------------| | 1 | VOUT | Output Voltage | | 2 | GND | Ground | | 3 | VDD | Supply Voltage | | 4 | VEE | Negative Supply Voltage | | 5 | PGOOD | Power Good Indicator | | 6 | FLT | Fault Indicator | | 7 | SDA | I2C Serial Data | | 8 | SCL | I2C Serial Clock | | 9 | ADIN | Analog Input | | 10 | ADOUT | Analog Output | | 11 | VREF | Reference Voltage | | 12 | NC | No Connection | | 13 | NC | No Connection | | 14 | NC | No Connection | | 15 | NC | No Connection | | 16 | NC | No Connection |

Functional Features

  • Integrated IEEE 802.3af/at/bt compliant PD interface
  • Supports both 2-pair and 4-pair PoE applications
  • Advanced power management with programmable current limit, voltage regulation, and thermal shutdown
  • I2C interface for configuration and monitoring
  • Power Good (PGOOD) and Fault (FLT) indicators for system status monitoring

Advantages and Disadvantages

Advantages: - High level of integration reduces external component count - Wide input voltage range allows compatibility with various power sources - Flexible power management features enable customization for different applications - I2C interface provides easy configuration and monitoring capabilities

Disadvantages: - Limited output current compared to some other PoE controllers - Relatively small package size may require careful PCB layout design

Working Principles

The LTC4278IDKD operates as a Power Sourcing Equipment (PSE) in a Power over Ethernet (PoE) system. It integrates the necessary circuitry to provide power and data to PoE-enabled devices. The controller supports IEEE 802.3af/at/bt standards, allowing it to work with a wide range of PoE devices.

The device utilizes an I2C interface for configuration and monitoring purposes. It offers advanced power management features such as programmable current limit, voltage regulation, and thermal shutdown. These features ensure safe and efficient power delivery to connected devices.

Detailed Application Field Plans

The LTC4278IDKD is suitable for a variety of applications that require power and data transmission over Ethernet cables. Some potential application fields include:

  1. IP Cameras: The controller can power and provide data connectivity to IP cameras, eliminating the need for separate power cables.

  2. Wireless Access Points: It enables the deployment of wireless access points in locations where power outlets are not readily available.

  3. VoIP Phones: PoE-enabled VoIP phones can be powered and connected using the LTC4278IDKD, simplifying installation and reducing cable clutter.

  4. Industrial Automation: The device can be used in industrial automation systems to power and communicate with various networked devices.

Detailed and Complete Alternative Models

  1. LTC4267-1: Similar to LTC4278IDKD, this PoE controller offers advanced power management features and supports IEEE 802.3af/at/bt standards. It comes in a different package (QFN-24) and has a higher maximum output current of 2.5A.

  2. LT4276A: This PoE controller is designed specifically for high-power applications. It supports the IEEE 802.3bt standard and can deliver up to 90W of power. It is

Lista 10 Vanliga frågor och svar relaterade till tillämpningen av LTC4278IDKD i tekniska lösningar

Sure! Here are 10 common questions and answers related to the application of LTC4278IDKD in technical solutions:

  1. Q: What is LTC4278IDKD? A: LTC4278IDKD is a Power over Ethernet (PoE) controller designed for use in various technical solutions.

  2. Q: What is the purpose of LTC4278IDKD? A: The purpose of LTC4278IDKD is to provide power and data connectivity to devices using Ethernet cables.

  3. Q: Can LTC4278IDKD be used in industrial applications? A: Yes, LTC4278IDKD is suitable for use in industrial applications due to its robust design and wide operating temperature range.

  4. Q: How many PoE ports can LTC4278IDKD support? A: LTC4278IDKD can support up to eight PoE ports, making it ideal for applications requiring multiple powered devices.

  5. Q: Does LTC4278IDKD support PoE+ (802.3at) standard? A: Yes, LTC4278IDKD supports the PoE+ standard, which allows for higher power delivery compared to the standard PoE (802.3af).

  6. Q: Can LTC4278IDKD be used with both 10/100Mbps and Gigabit Ethernet networks? A: Yes, LTC4278IDKD is compatible with both 10/100Mbps and Gigabit Ethernet networks, providing flexibility in various network setups.

  7. Q: Is LTC4278IDKD capable of detecting and protecting against short circuits or overloads? A: Yes, LTC4278IDKD features integrated protection mechanisms such as current limiters and thermal shutdown to safeguard against short circuits and overloads.

  8. Q: Can LTC4278IDKD operate in standalone mode or does it require a microcontroller? A: LTC4278IDKD can operate in standalone mode, but it also supports communication with a microcontroller for advanced control and monitoring capabilities.

  9. Q: What is the maximum power that LTC4278IDKD can deliver to each PoE port? A: LTC4278IDKD can deliver up to 25.5W of power per PoE port, depending on the power source and the device's power requirements.

  10. Q: Are there any evaluation boards or reference designs available for LTC4278IDKD? A: Yes, Linear Technology (now part of Analog Devices) provides evaluation boards and reference designs to help users quickly prototype and implement LTC4278IDKD in their technical solutions.

Please note that these answers are general and may vary depending on specific product specifications and application requirements.