LM2678S-3.3

Voltage Regulators - DC DC Switching Regulators Overview

The LM2678S-3.3 is a monolithic integrated circuit from the SIMPLE SWITCHER family, functioning as a high-efficiency step-down DC/DC switching regulator. It operates with an input voltage range of 8V to 40V and provides a fixed output voltage of 3.3V at a maximum load current of 5A. The device utilizes a buck topology with a typical switching frequency of 260 kHz. It is housed in a TO-263-7 (DDPAK) surface-mount package and supports an operating junction temperature range from -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates all active functions for a buck switching regulator into a single IC
• Achieves high efficiency exceeding 90% through low on-resistance DMOS power switches
• Includes internal compensation and fixed-frequency oscillator for simplified design
• Features thermal shutdown and current limit protection for robust operation

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for embedded systems
• Battery-powered equipment requiring efficient step-down conversion
• Industrial control systems with 12V or 24V bus architectures
• Telecommunications infrastructure power distribution

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix configuration against the manufacturer's latest datasheet to ensure compatibility with required pinout and electrical specifications. Confirm RoHS compliance status and lead times directly with authorized distributors, as availability may vary by region. Ensure proper handling procedures are followed due to moisture sensitivity classification associated with the surface-mount packaging type.

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 continuous current with minimal external component count. Consider the TO-263 package for adequate thermal dissipation without additional heatsinking in moderate ambient conditions. Verify that the 260 kHz switching frequency aligns with EMI constraints and inductor size requirements.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2678 series of SIMPLE SWITCHER regulators, which offers a range of fixed and adjustable output voltages. The 'S' indicates the TO-263 surface-mount package, while '-3.3' specifies the fixed 3.3V output variant. The series is designed to simplify power supply design by integrating the controller, driver, and power switch into one chip.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Check for LM2678S-3.3/NOPB as a direct equivalent with specified environmental compliance. Other variants within the LM2678 family share similar electrical characteristics but differ in output voltage or package style.