LM2678LD-3.3

Voltage Regulators - DC DC Switching Regulators Overview

The LM2678LD-3.3 is a monolithic integrated circuit from the SIMPLE SWITCHER series, 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 maximum switching frequency of 260kHz and a typical quiescent current of 4.2mA. It supports a thermal operating range from -40°C to +125°C junction temperature.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates all active functions for a buck converter topology within a single IC
• Utilizes low on-resistance DMOS power switch for high conversion efficiency
• Includes internal frequency compensation and fixed 3.3V output option
• Features adjustable switching frequency capability up to 260kHz

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for embedded systems
• Battery-powered equipment requiring efficient voltage stepping
• Industrial control systems with 12V or 24V input rails
• Telecommunications infrastructure power distribution

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer origin, as National Semiconductor assets were acquired by Texas Instruments. Confirm the package type matches design requirements, typically VSON-14 for this suffix. Check RoHS compliance status, as older batches may not meet current environmental standards. Ensure the specific revision level aligns with your schematic references. Validate availability through authorized distributors given potential lifecycle changes.

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 applications demanding up to 5A load current with minimal external component count. Consider the VSON-14 package for space-constrained PCB layouts. Evaluate thermal performance at full load to ensure adequate heat dissipation without excessive heatsinking.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2678 family of SIMPLE SWITCHER regulators, designed for high-efficiency step-down conversion. The 'LD' suffix indicates a specific package variant, often associated with compact surface-mount configurations like VSON. The '3.3' denotes the fixed output voltage setting. This series replaces older linear regulators in high-current applications to reduce power loss and heat generation.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2678SD-3.3/NOPB: Same functionality with different package (VSON vs TO-263). LM2678SX-3.3/NOPB: Alternative TO-263 package version. LM2678T-3.3/NOPB: Through-hole TO-220 package option. Verify pinout compatibility and thermal characteristics before substitution.