LM5071MT-80

Product Overview

Category: Integrated Circuit (IC)

Use: Power over Ethernet (PoE) Controller

Characteristics: - High efficiency - Wide input voltage range - Supports various PoE applications - Advanced protection features

Package: TSSOP-20

Essence: The LM5071MT-80 is a highly efficient PoE controller designed for power sourcing equipment (PSE) in PoE systems.

Packaging/Quantity: The LM5071MT-80 is typically sold in reels of 250 units.

Specifications

• Input Voltage Range: 36V to 57V
• Output Voltage Range: 3.3V to 55V
• Maximum Output Power: 25W
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The LM5071MT-80 has a total of 20 pins, which are configured as follows:

1. VDD: Power supply input
2. GND: Ground reference
3. VREF: Reference voltage output
4. FB: Feedback pin for output voltage regulation
5. EN: Enable pin for device operation
6. ILIM: Current limit setting pin
7. RTN: Return path for current sense resistor
8. VCC: Internal bias voltage output
9. VOUT: Output voltage pin
10. VSENSE: Voltage sense input pin
11. VDET: Detection threshold voltage input
12. VTH: Threshold voltage input for classification
13. VDIAG: Diagnostic output pin
14. VEE: Negative supply voltage input
15. VBIAS: Bias voltage input
16. VCLASS: Classification voltage input
17. VDIS: Disable voltage input
18. VPORT: Port voltage input
19. VPORT2: Second port voltage input
20. VPORT3: Third port voltage input

Functional Features

• Integrated IEEE 802.3af-compliant detection and classification circuitry
• Programmable current limit and inrush current control
• Advanced protection features including overcurrent, overvoltage, and thermal shutdown
• Supports both end-span and mid-span PSE applications
• Flexible power management options

Advantages and Disadvantages

Advantages: - High efficiency design reduces power dissipation - Wide input voltage range allows for compatibility with various PoE systems - Comprehensive protection features ensure safe operation - Versatile power management options provide flexibility in system design

Disadvantages: - Limited maximum output power of 25W may not be suitable for high-power PoE applications - TSSOP-20 package may require careful handling during assembly

Working Principles

The LM5071MT-80 operates by receiving power from an external DC source and converting it into a regulated output voltage suitable for powering PoE devices. It incorporates advanced circuitry to detect and classify connected devices according to the IEEE 802.3af standard. The controller also provides various protection mechanisms to safeguard against fault conditions.

Detailed Application Field Plans

The LM5071MT-80 is commonly used in the following application fields:

1. IP cameras
2. Wireless access points
3. VoIP phones
4. Network switches
5. Industrial automation equipment

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the LM5071MT-80 include:

1. LTC4267-2
2. TPS23861
3. MAX5941A

These models can be considered as alternatives based on specific requirements and system constraints.

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