LM5070SDX-80/NOPB

Overview

The LM5070SDX-80/NOPB is an integrated Power Over Ethernet (PoE) Powered Device (PD) interface and PWM controller manufactured by Texas Instruments. Designed for IEEE 802.3af compliance, this component combines a current-mode DC-DC controller with a PD interface in a single package. It operates within a supply voltage range of 1.8 V to 75 V and supports switching frequencies up to 665 kHz. The device features user-programmable under-voltage thresholds and hysteresis, along with a dedicated fault current control loop. Packaged in an 8-pin WSON (5x5 mm) format, it is optimized for compact PoE applications requiring efficient power management.

Feature Summary

• Integrates a current-mode DC-DC controller with a PoE PD interface for space-constrained designs
• Supports programmable under-voltage thresholds and hysteresis for flexible system configuration
• Includes a dedicated fault current control loop to enhance system reliability
• Complies with IEEE 802.3af standards for standard PoE operation

Applications

• IEEE 802.3af compliant Powered Devices
• Power-over-Ethernet endpoint circuits
• Compact network infrastructure equipment

Procurement Notes

Verify the specific suffix 'SDX' against the official datasheet to confirm the reel packaging variant and temperature grade. Ensure the design accounts for the 80V rating limits defined in the electrical characteristics table. Cross-reference the pinout diagram with the target PCB footprint to prevent orientation errors during assembly.

Selection Notes

Select this component when a combined PoE interface and buck converter solution is required to minimize board space. It is suitable for designs needing programmable voltage thresholds and robust fault protection. Consider the thermal performance of the WSON package relative to the expected power dissipation in the final application environment.

Part Context

This part belongs to the LM5070 family of integrated PoE controllers from Texas Instruments. The family provides solutions for both Power Sourcing Equipment (PSE) and Powered Device (PD) implementations. The LM5070 series is widely used in industrial and commercial networking applications where reliable power delivery over Ethernet cables is essential.

Replacement Considerations

LM5070SD-50/NOPB: Similar WSON package but rated for different voltage levels; verify compatibility with the 80V requirement.