The LM5072MH-80 from Texas Instruments is a highly integrated Power over Ethernet (PoE) Powered Device (PD) interface and pulse-width modulation (PWM) controller. It provides a complete solution for PDs requiring efficient conversion of power from PoE sources to a regulated voltage. This device is designed to meet the IEEE 802.3af standard for PoE, ensuring compatibility with PoE infrastructure.

Key Features:

• Integrated PoE PD interface and PWM controller
• Supports IEEE 802.3af standard-compliant PoE systems
• Programmable classification current for power level indication
• Adjustable undervoltage lockout for optimized power management
• Supports a variety of output voltage configurations
• High-efficiency operation with peak current mode control
• Thermal shutdown protection
• Available in a 16-pin surface-mount TSSOP package

Applications:

• VoIP Phones
• Wireless Access Points
• Security Cameras
• RFID Readers
• Networked Appliances

The LM5072MH-80 integrates a signature resistor and classification current source that allows the PD to communicate with Power Sourcing Equipment (PSE) over the Ethernet cable. The classification feature ensures that the device can negotiate for the required power level from the PSE. The adjustable UVLO (Undervoltage Lockout) allows the device to operate with different input voltage levels, making it versatile for various applications.

With its built-in PWM controller, the LM5072MH-80 can directly drive an external MOSFET, facilitating the design of a wide range of isolated and non-isolated power supply configurations. The peak current mode control scheme provides excellent transient response and simplifies loop compensation. To ensure reliability and safety, the device includes over-temperature protection that shuts down the PWM controller if the internal temperature exceeds safe operating limits.

The efficiency and flexibility of the LM5072MH-80 make it an excellent choice for designers looking to integrate PoE capabilities into their products with minimal additional components and complexity.