LM2678SX-3.3

Voltage Regulators - DC DC Switching Regulators Overview

The LM2678SX-3.3/NOPB is a monolithic integrated circuit from the SIMPLE SWITCHER family, functioning as a high-efficiency 5A step-down DC/DC switching regulator. It operates with an input voltage range of 8V to 40V and provides a fixed 3.3V output. The device utilizes a low on-resistance DMOS power switch to achieve efficiency exceeding 90%. Key electrical parameters include a switching frequency of 260 kHz, a maximum output current of 5A, and a quiescent current of 4.2 mA. It supports surface-mount installation in a TO-263-7 package and functions within a temperature range of -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates all active components required for a buck switching regulator topology
• Delivers high conversion efficiency through low on-resistance DMOS power switches
• Includes internal compensation and frequency compensation for stable operation
• Features thermal shutdown protection to safeguard against overheating

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for embedded systems
• Power supply stages for microprocessors and DSPs
• Battery-powered equipment requiring efficient voltage stepping
• Industrial control systems with wide input voltage ranges

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the complete part number suffix, specifically /NOPB, to confirm lead-free compliance and RoHS status. Ensure the ordering code matches the specific package variant (TO-263-7) and fixed output voltage (3.3V). Cross-reference manufacturer datasheets for latest revision details and recommended external component values to guarantee design compatibility.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V output is required from an 8V to 40V input source. It is suitable for designs needing up to 5A load current with minimal external component count. Consider the TO-263-7 package for adequate thermal dissipation in space-constrained applications without excessive heatsinking requirements.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM2678 series of SIMPLE SWITCHER regulators, which also includes adjustable versions and other fixed voltage outputs like 5V and 12V. The series is characterized by its simplicity, high efficiency, and robust protection features. The LM2678SX-3.3/NOPB represents the specific fixed-output variant designed for standard 3.3V logic and power rail generation.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2678SX-3.3/NOPB is the direct lead-free equivalent of the older LM2678SX-3.3. For pin-compatible alternatives, consider the LM2678S-ADJ/NOPB if adjustable output is acceptable, or the LM2676SX-3.3/NOPB for lower current applications.