LT4275AIMS#PBF

Product Overview

Category

LT4275AIMS#PBF belongs to the category of integrated circuits (ICs).

Use

This product is commonly used in power sourcing equipment (PSE) applications.

Characteristics

• LT4275AIMS#PBF is a highly efficient, 4-port PoE/PoE+ PSE controller.
• It supports both IEEE 802.3af and 802.3at standards.
• The device integrates all necessary functions required for a PSE system.
• It provides advanced power management features and fault protection mechanisms.

Package

LT4275AIMS#PBF comes in a small MSOP-16 package.

Essence

The essence of this product lies in its ability to efficiently control and manage power delivery in PoE systems.

Packaging/Quantity

LT4275AIMS#PBF is typically packaged in reels containing 250 units.

Specifications

• Input Voltage Range: 36V to 57V
• Output Voltage Range: 44V to 57V
• Maximum Output Power: 30W per port
• Operating Temperature Range: -40°C to 85°C
• Efficiency: Up to 94%
• Quiescent Current: 100µA

Detailed Pin Configuration

1. VDD: Power supply input
2. GND: Ground reference
3. MDI1-: Negative terminal of Port 1
4. MDI1+: Positive terminal of Port 1
5. MDI2-: Negative terminal of Port 2
6. MDI2+: Positive terminal of Port 2
7. MDI3-: Negative terminal of Port 3
8. MDI3+: Positive terminal of Port 3
9. MDI4-: Negative terminal of Port 4
10. MDI4+: Positive terminal of Port 4
11. VEE: Negative supply voltage
12. VREF: Reference voltage output
13. FLT: Fault indicator output
14. INTVCC: Internal voltage regulator output
15. NC: No connection
16. NC: No connection

Functional Features

• Integrated detection and classification circuitry for connected devices.
• Programmable current limit and prioritization for power allocation.
• Comprehensive fault protection mechanisms, including overcurrent and overtemperature shutdown.
• Supports both 2-event and 4-event classification methods.
• Provides accurate load current monitoring.

Advantages and Disadvantages

Advantages

• Highly efficient power delivery with up to 94% efficiency.
• Advanced fault protection ensures safe operation.
• Flexible power allocation and prioritization options.
• Compact package size allows for space-saving designs.

Disadvantages

• Limited to 4-port PSE applications.
• Requires external components for complete PSE implementation.

Working Principles

LT4275AIMS#PBF operates by receiving power from an external power source and efficiently delivering it to connected powered devices (PDs). The device incorporates detection and classification circuitry to identify the power requirements of connected PDs. It then allocates power accordingly, ensuring optimal power delivery while adhering to IEEE 802.3af/at standards. The LT4275AIMS#PBF also includes various fault protection mechanisms to safeguard against overcurrent and overtemperature conditions.

Detailed Application Field Plans

The LT4275AIMS#PBF is widely used in various PoE applications, including: - IP cameras and surveillance systems - Wireless access points - VoIP phones - Industrial automation systems - Building management systems

Detailed and Complete Alternative Models

1. LT4276AIMS#PBF: 6-port PoE/PoE+ PSE controller with similar features and specifications.
2. LT4277AIMS#PBF: 8-port PoE/PoE+ PSE controller with extended port capacity.
3. LT4279AIMS#PBF: 12-port PoE/PoE+ PSE controller for larger-scale applications.

These alternative models offer expanded port capacity while maintaining the core functionality and characteristics of the LT4275AIMS#PBF.

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