LM2678SX-3.3/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2678SX-3.3/NOPB is a Texas Instruments SIMPLE SWITCHER step-down DC/DC switching regulator in a TO-263-7 (D2PAK) surface-mount package. It operates with an input voltage range of 8 V to 40 V and provides a fixed 3.3 V output at up to 5 A. The device features a typical switching frequency of 260 kHz, ensuring high efficiency exceeding 90% through low on-resistance DMOS power switches. It includes internal compensation for stability, thermal shutdown protection, and a shutdown pin for standby mode operation.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated DMOS power switch enables high conversion efficiency above 90 percent
• Fixed 3.3 V output eliminates external feedback resistor requirements
• Internal frequency compensation simplifies design and reduces component count
• Thermal shutdown protects the device during overtemperature conditions

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for digital logic circuits
• Battery-powered equipment requiring efficient step-down conversion
• Industrial control systems with wide input voltage ranges
• Embedded systems needing stable 3.3 V power supply

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the exact ordering suffix matches the required package and temperature grade. Confirm RoHS compliance status as indicated by the NOPB designation. Ensure the supplier provides valid traceability documentation. Check for any specific handling instructions related to moisture sensitivity level 3 classification during storage and reflow soldering processes.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this part when a fixed 3.3 V output is required from an 8 V to 40 V input source. It is suitable for applications demanding up to 5 A continuous current with minimal external components. Consider the TO-263-7 package for its thermal performance advantages over smaller packages in higher power scenarios.

Voltage Regulators - DC DC Switching Regulators Part Context

This component belongs to the LM2678 series of SIMPLE SWITCHER regulators. The series offers various fixed voltage options including 3.3 V, 5 V, and 12 V, alongside adjustable versions. All variants share the same core architecture, switching frequency, and protection features, differing primarily in output voltage configuration and packaging options.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2678SX-ADJ/NOPB: Adjustable output version with identical electrical characteristics and package.