LT4275AHDD#TRPBF

Product Overview

Category

The LT4275AHDD#TRPBF 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) applications in Power over Ethernet (PoE) systems. It enables the efficient transfer of power and data over standard Ethernet cables.

Characteristics

• High efficiency: The LT4275AHDD#TRPBF offers high efficiency power conversion, minimizing energy losses during power transfer.
• Compact package: It comes in a small form factor package, allowing for easy integration into various PoE system designs.
• Advanced features: This IC incorporates advanced features such as thermal shutdown protection, undervoltage lockout, and adjustable current limit.

Package and Quantity

The LT4275AHDD#TRPBF is available in a 12-pin DFN (Dual Flat No-Lead) package. It is typically sold in reels containing a quantity of 250 units.

Specifications

• Input Voltage Range: 36V to 57V
• Output Voltage Range: 3.3V to 24V
• Maximum Output Current: 400mA
• Operating Temperature Range: -40°C to 85°C
• Efficiency: Up to 90%
• Quiescent Current: 100µA

Pin Configuration

The LT4275AHDD#TRPBF has the following pin configuration:

1. VOUT
2. GND
3. GND
4. NC
5. NC
6. NC
7. NC
8. VIN
9. NC
10. NC
11. NC
12. NC

Functional Features

• Integrated power MOSFET: The LT4275AHDD#TRPBF integrates a power MOSFET, simplifying the design and reducing external component count.
• Programmable current limit: It allows for adjustable current limit settings to meet specific application requirements.
• Thermal shutdown protection: The IC includes a thermal shutdown feature that protects against excessive temperature conditions.
• Undervoltage lockout: This feature ensures proper operation by disabling the device when the input voltage falls below a specified threshold.

Advantages and Disadvantages

Advantages

• High efficiency power conversion reduces energy losses.
• Compact package enables easy integration into various designs.
• Advanced features provide protection and flexibility in PoE applications.

Disadvantages

• Limited maximum output current of 400mA may not be suitable for high-power applications.
• Requires additional external components for complete PoE system implementation.

Working Principles

The LT4275AHDD#TRPBF operates based on a flyback topology. It utilizes a power MOSFET to convert the input voltage from the PoE source into a regulated output voltage. The integrated control circuitry ensures efficient power transfer while providing necessary protection features.

Application Field Plans

The LT4275AHDD#TRPBF finds extensive use in various Power over Ethernet applications, including: - IP cameras and surveillance systems - Wireless access points - VoIP phones - Industrial automation equipment - Building management systems

Alternative Models

For those seeking alternative options, the following models can be considered: - LT4275AIDD#TRPBF - LT4275HDD#TRPBF - LT4275IDD#TRPBF

These models offer similar functionality and characteristics, providing flexibility in choosing the most suitable solution for specific PoE applications.

In conclusion, the LT4275AHDD#TRPBF is a highly efficient integrated circuit designed for Power over Ethernet applications. Its compact package, advanced features, and adjustable current limit make it an ideal choice for various PoE system designs.