LTC4268CDKD-1

Product Overview

Category

The LTC4268CDKD-1 belongs to the category of integrated circuits (ICs) specifically designed for power management applications.

Use

This product is primarily used for power sourcing equipment (PSE) in Power over Ethernet (PoE) systems. It enables the delivery of both data and power over a single Ethernet cable, eliminating the need for separate power cables.

Characteristics

• Integrated circuit for PoE applications
• Supports IEEE 802.3af/at standards
• Provides power classification and detection
• Offers advanced power management features
• Operates with low power consumption
• Compact and efficient design

Package

The LTC4268CDKD-1 is available in a small form factor package, making it suitable for space-constrained applications. The package type is DFN (Dual Flat No-Lead), which ensures reliable electrical connections and thermal performance.

Essence

The essence of LTC4268CDKD-1 lies in its ability to efficiently manage power delivery in PoE systems, ensuring reliable operation of connected devices while simplifying installation and reducing overall costs.

Packaging/Quantity

This product is typically supplied in tape and reel packaging, allowing for easy integration into automated assembly processes. The exact quantity per reel may vary depending on the supplier, but a common quantity is 250 units per reel.

Specifications

• Input Voltage Range: 36V to 57V
• Output Voltage Range: 2.7V to 14V
• Maximum Output Current: 400mA
• Operating Temperature Range: -40°C to 85°C
• Power Dissipation: 1.5W (typical)

Detailed Pin Configuration

The LTC4268CDKD-1 features a total of 16 pins, each serving a specific function. The pin configuration is as follows:

1. VDD - Power supply input
2. GND - Ground reference
3. PSECTRL - Control pin for PSE operation
4. CLASS - Classification resistor connection
5. DETECT - Detection resistor connection
6. ILIM - Current limit setting
7. VOUT - Output voltage
8. NC - No connect
9. NC - No connect
10. NC - No connect
11. NC - No connect
12. NC - No connect
13. NC - No connect
14. NC - No connect
15. NC - No connect
16. NC - No connect

Functional Features

The LTC4268CDKD-1 offers several functional features that enhance its performance and usability in PoE applications:

• Integrated power classification and detection for accurate device identification
• Automatic current limit adjustment based on the detected device requirements
• Programmable undervoltage lockout (UVLO) protection to prevent damage during power fluctuations
• Thermal shutdown protection to safeguard against excessive heat
• Fast fault recovery and automatic restart after a fault condition is resolved
• Low power consumption in standby mode to minimize energy waste

Advantages and Disadvantages

Advantages

• Compliance with IEEE 802.3af/at standards ensures compatibility with a wide range of PoE devices
• Efficient power management capabilities optimize power delivery and reduce energy consumption
• Compact package size enables integration into space-constrained designs
• Advanced protection features enhance system reliability and longevity

Disadvantages

• Limited maximum output current may restrict usage in high-power applications
• Temperature range limited to -40°C to 85°C, which may not be suitable for extreme environments

Working Principles

The LTC4268CDKD-1 operates by monitoring the electrical characteristics of the connected PoE device. It uses a combination of power classification and detection techniques to identify the device's power requirements accurately. Based on this information, the LTC4268CDKD-1 adjusts the current limit and output voltage accordingly to ensure optimal power delivery.

Detailed Application Field Plans

The LTC4268CDKD-1 finds applications in various fields where PoE technology is utilized. Some of the key application areas include:

1. IP Surveillance Systems: Enables the integration of IP cameras and other surveillance devices into existing Ethernet infrastructure without the need for separate power cables.
2. Wireless Access Points: Provides power to wireless access points, allowing for flexible placement and easy expansion of Wi-Fi networks.
3. VoIP Phones: Simplifies the installation of Voice over IP (VoIP) phones by delivering both data and power through a single Ethernet cable.
4. Building Automation: Facilitates the deployment of automation systems, such as lighting controls and HVAC systems, by eliminating the need for additional wiring.
5. Industrial Control Systems: Powers various industrial control devices, such as sensors and actuators, in a cost-effective and efficient manner.

Detailed and Complete Alternative Models

1. LTC4267CDKD-1: Similar to LTC4268CDKD-1 but with a