LM5070SD-80/NOPB

Overview

The LM5070SD-80/NOPB is a Power Over Ethernet (PoE) Powered Device controller manufactured by Texas Instruments, continuing the National Semiconductor lineage. It integrates an IEEE 802.3af-compliant PD interface and a PWM controller with an internal high-side switch. The device supports input voltages from 1.8V to 75V and operates within a temperature range of -40°C to 125°C. Packaged in a compact 16-WSON (5x5mm) format, it provides a complete solution for PoE applications requiring efficient power management and strict protocol compliance.

Feature Summary

• Integrates IEEE 802.3af compliant Powered Device interface with internal high-side switch
• Combines PD classification logic with integrated PWM controller for DC/DC conversion
• Supports wide operating supply voltage range up to 75V
• Provides compact surface-mount packaging for space-constrained designs

Applications

• Power-over-Ethernet powered devices
• Industrial networking equipment
• IoT sensor nodes with PoE connectivity
• Compact communication modules

Procurement Notes

Verify the manufacturer designation carefully as the component originates from National Semiconductor but is now distributed under Texas Instruments branding. Confirm the specific suffix 'SD-80' matches the required package and thermal specifications. Ensure compatibility with current supply chain channels managed by TI. Cross-reference datasheet revisions to confirm pinout consistency with existing board layouts.

Selection Notes

Select this component when designing systems requiring full IEEE 802.3af compliance in a minimal footprint. It is suitable for applications needing integrated classification and power regulation without external controllers. Consider the 16-WSON package constraints for thermal dissipation. Evaluate the 75V maximum input rating against potential transient spikes in the network environment.

Part Context

This part belongs to the LM5070 family of PoE controllers. While originally developed by National Semiconductor, production and support have transitioned to Texas Instruments. The SD variant specifically denotes the WSON package option. This integration simplifies design by combining interface and control functions into a single chip.

Replacement Considerations

LM5070SD-50/NOPB offers similar functionality in the same package but may differ in specific electrical characteristics or revision status.