LM5071MT-80

Overview

The LM5071MT-80 is a switching controller manufactured by National Semiconductor, now Texas Instruments. It features a maximum switching frequency of 665 kHz and utilizes a PDSO16 package. The device operates within an input voltage range of 1.8 V to 60 V, with a rated input voltage of 48 V. It supports peak current control mode and pulse width modulation technology. The component is designed for automotive temperature levels, functioning between -40°C and +125°C.

Feature Summary

• Supports auxiliary backup operation using AC adapters outputting DC voltages from 9.5 to 48 volts
• Integrates Power over Ethernet powered-device interface with current-mode DC/DC converter controller
• Compatible with various isolated and non-isolated converter topologies including buck converters

Applications

• Power over Ethernet (PoE) powered devices
• AC adapter powered systems
• Isolated and non-isolated DC/DC converter designs

Procurement Notes

Verify the manufacturer designation as National Semiconductor or Texas Instruments on official datasheets. Confirm the specific suffix 'MT-80' matches the required package and temperature grade. Ensure compatibility with PoE standards if used in networked applications. Cross-reference part numbers with TI documentation to avoid confusion with similar models like LM5073.

Selection Notes

Select this component when designing PoE-powered devices requiring auxiliary backup capabilities. It is suitable for applications needing integration of PoE interfaces with DC/DC conversion. Consider its 665 kHz switching frequency and wide input voltage range for flexible power supply designs. Verify thermal performance requirements against the specified operating temperature range.

Part Context

The LM5071 series includes variants such as LM5073, which offers higher power capabilities exceeding IEEE 802.3af standards. These controllers are often paired with Ethernet PHY chips like DP83848 for complete PoE solutions. The LM5071 focuses on integrating PoE PD interface functions directly with the DC/DC controller.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided data.