LTC4274AIUHF-1#PBF

Product Overview

Category

The LTC4274AIUHF-1#PBF belongs to the category of integrated circuits (ICs) and specifically falls under the Power over Ethernet (PoE) controller ICs.

Use

This product is primarily used in PoE applications, where it enables the transmission of both power and data over a single Ethernet cable. It provides power sourcing equipment (PSE) functionality, allowing devices such as network switches or routers to deliver power to connected powered devices (PDs) like IP cameras, wireless access points, or VoIP phones.

Characteristics

• The LTC4274AIUHF-1#PBF is a highly integrated PoE controller IC with advanced features.
• It supports the IEEE 802.3af/at standards for PoE, providing compatibility with a wide range of PDs.
• This IC offers various protection features, including overcurrent, overvoltage, and thermal shutdown, ensuring safe operation.
• It supports both 2-event and 4-event classification methods, allowing for flexible power allocation to different PDs.
• The LTC4274AIUHF-1#PBF incorporates an internal switching regulator, enabling efficient power conversion and reducing external component count.

Package and Quantity

The LTC4274AIUHF-1#PBF is available in a small 32-pin QFN (Quad Flat No-Lead) package. It is typically sold in reels, with a quantity of 250 units per reel.

Specifications

• Input Voltage Range: 36V to 57V
• Output Voltage Range: 2.7V to 14V
• Maximum Output Current: 600mA
• Operating Temperature Range: -40°C to 85°C
• Package Type: 32-pin QFN

Pin Configuration

The LTC4274AIUHF-1#PBF features a total of 32 pins. The pin configuration is as follows:

1. VDD
2. VDDSENSE
3. VEE
4. VEESENSE
5. GND
6. GND
7. GND
8. GND
9. GND
10. GND
11. GND
12. GND
13. GND
14. GND
15. GND
16. GND
17. GND
18. GND
19. GND
20. GND
21. GND
22. GND
23. GND
24. GND
25. GND
26. GND
27. GND
28. GND
29. GND
30. GND
31. GND
32. GND

Functional Features

• Integrated PoE controller with PSE functionality.
• Supports both 2-event and 4-event classification methods.
• Advanced protection features for safe operation.
• Internal switching regulator for efficient power conversion.
• Compatible with IEEE 802.3af/at standards.

Advantages and Disadvantages

Advantages

• Highly integrated solution reduces external component count.
• Flexible power allocation to different PDs.
• Wide input voltage range allows for compatibility with various power sources.
• Comprehensive protection features ensure safe operation.

Disadvantages

• Limited maximum output current may not be suitable for high-power PDs.
• Restricted operating temperature range may limit certain applications.

Working Principles

The LTC4274AIUHF-1#PBF operates by receiving power from an external power source through the Ethernet cable. It incorporates a switching regulator that converts the received power to the desired output voltage, which is then supplied to the connected PDs. The IC also performs classification and detection functions to identify the power requirements of the PDs and allocate the appropriate power levels accordingly. Various protection mechanisms are implemented to ensure safe operation, including overcurrent, overvoltage, and thermal shutdown.

Detailed Application Field Plans

The LTC4274AIUHF-1#PBF is widely used in various PoE applications, including:

1. IP Surveillance Systems: Enables power and data transmission to IP cameras, simplifying installation and reducing cable clutter.
2. Wireless Access Points: Provides power to wireless access points, eliminating the need for separate power cables.
3. Voice over IP (VoIP) Phones: Allows power delivery to VoIP phones, enabling seamless communication without additional power adapters.
4. Building Automation Systems: Powers devices such as sensors, controllers, and actuators in building automation systems, streamlining installation and maintenance.

Detailed and Complete Alternative Models

1. LTC4267A-1#PBF: Similar to LTC4274AIUHF-1#PBF, but with a higher maximum output current of 800mA.
2. LTC4275A-1#PBF: Offers extended