LM5071MTX-50/NOPB

Overview

The LM5071MTX-50/NOPB is an integrated Power over Ethernet (PoE) Powered Device (PD) interface controller and PWM controller manufactured by Texas Instruments. Designed for IEEE 802.3af compliance, it manages PD detection, classification, and power switching. The device integrates a high-voltage startup circuit and supports external MOSFET control for efficient power delivery. It operates within a specified input voltage range suitable for standard PoE applications, ensuring reliable communication with the Power Sourcing Equipment (PSE).

Feature Summary

• Integrates full IEEE 802.3af compliant PD interface logic with PWM controller functionality.
• Features a high-voltage startup circuit enabling operation directly from PoE lines without auxiliary supplies.
• Supports precise classification and detection sequences to ensure compatibility with standard PSEs.

Applications

• IEEE 802.3af Powered Devices requiring integrated control and power management.
• Network infrastructure equipment such as IP cameras and wireless access points.
• Industrial automation systems utilizing Power over Ethernet for data and power transmission.

Procurement Notes

Verify the specific suffix '50' indicates the intended operating characteristics or package variant against the official datasheet. Confirm RoHS compliance status via the manufacturer's documentation. Ensure the ordering part number matches the exact tape and reel specifications required for your assembly process. Cross-reference the pinout diagram with your PCB layout to prevent integration errors.

Selection Notes

Select this component when a single-chip solution for both PoE interface management and downstream DC-DC conversion control is required. It is suitable for designs needing strict adherence to IEEE 802.3af standards. Consider the thermal performance of the MSOP package if high current loads are expected in the application environment. Evaluate the external component count reduction benefits compared to discrete solutions.

Part Context

This part belongs to the LM507x family of integrated PoE controllers. It complements other variants like the LM5070 by offering specific configuration options for different power budgets or feature sets. The family is designed to simplify the design of networked devices that require robust power delivery over Ethernet cabling.

FAQ

Does the LM5071 support IEEE 802.3at (PoE+)?

No, the LM5071 is specifically designed for IEEE 802.3af (PoE) compliant applications. For PoE+ support, consider the LM5072 which includes aux support and higher power capabilities.

What is the function of the internal startup circuit?

The internal high-voltage startup circuit allows the device to operate directly from the PoE line voltage during the initial detection and classification phases, eliminating the need for an auxiliary power supply.