LT4256-1IS8#TRPBF

Product Overview

Category

The LT4256-1IS8#TRPBF belongs to the category of integrated circuits (ICs).

Use

This IC is commonly used for power sourcing equipment (PSE) applications in Power over Ethernet (PoE) systems.

Characteristics

• The LT4256-1IS8#TRPBF is a high-power, single-port PoE controller.
• It supports both IEEE 802.3af and IEEE 802.3at standards.
• This IC provides a complete solution for implementing PSE functionality in PoE systems.
• It offers advanced features such as programmable current limit, thermal shutdown protection, and fault detection.
• The LT4256-1IS8#TRPBF operates with a wide input voltage range and can deliver up to 25.5W of power.

Package

The LT4256-1IS8#TRPBF is available in an 8-pin small outline integrated circuit (SOIC) package.

Essence

The essence of the LT4256-1IS8#TRPBF lies in its ability to efficiently control and manage power delivery in PoE systems.

Packaging/Quantity

This IC is typically sold in reels or tubes, with a quantity of 250 units per reel/tube.

Specifications

• Input Voltage Range: 36V to 57V
• Output Voltage Range: 44V to 57V
• Maximum Output Power: 25.5W
• Operating Temperature Range: -40°C to 85°C
• Package Type: SOIC-8

Detailed Pin Configuration

The LT4256-1IS8#TRPBF has the following pin configuration:

1. VCC - Power supply input
2. GND - Ground
3. FLT - Fault indicator output
4. EN - Enable pin
5. ILIM - Current limit programming pin
6. VOUT - Output voltage
7. NC - No connection
8. NC - No connection

Functional Features

• IEEE 802.3af/at compliant PSE controller
• Programmable current limit for power management
• Thermal shutdown protection to prevent overheating
• Fault detection and indication for system monitoring
• Wide input voltage range for compatibility with various PoE systems

Advantages and Disadvantages

Advantages

• Supports both IEEE 802.3af and IEEE 802.3at standards, providing flexibility in PoE system design.
• Advanced features like programmable current limit and fault detection enhance system reliability.
• Wide input voltage range allows compatibility with a wide range of PoE systems.

Disadvantages

• Limited to single-port PoE applications, not suitable for multi-port PSE designs.
• The SOIC package may require additional PCB space compared to smaller package options.

Working Principles

The LT4256-1IS8#TRPBF operates as a PSE controller in PoE systems. It receives power from an external power source and manages the delivery of power to connected powered devices (PDs). The IC implements the necessary functions to comply with IEEE 802.3af/at standards, including classification, detection, and power negotiation. It also provides protection mechanisms such as current limiting and thermal shutdown to ensure safe operation.

Detailed Application Field Plans

The LT4256-1IS8#TRPBF is widely used in various PoE applications, including:

1. IP Cameras: This IC enables the power supply for IP cameras over Ethernet cables, simplifying installation and reducing wiring complexity.
2. Wireless Access Points: It powers wireless access points, allowing them to be conveniently deployed in locations without easy access to AC power outlets.
3. VoIP Phones: The LT4256-1IS8#TRPBF facilitates the integration of power and data transmission in VoIP phones, eliminating the need for separate power adapters.
4. Network Switches: It enables PoE functionality in network switches, providing power to connected devices such as IP phones, cameras, and wireless access points.

Detailed and Complete Alternative Models

1. LT4275-1IS8#TRPBF: Similar to the LT4256-1IS8#TRPBF, this IC is a single-port PoE controller with advanced features and wide input voltage range.
2. LTC4267CGN#PBF: This IC is a multi-port PoE controller, suitable for applications requiring power delivery to multiple devices simultaneously.
3. LT8309ES8#TRPBF: A PoE PD controller designed for powered device applications, offering efficient power management and protection features.

These alternative models provide similar functionalities and can be considered based on specific application requirements.

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