LM2676LD-3.3

Voltage Regulators - DC DC Switching Regulators Overview

The LM2676LD-3.3 is a SIMPLE SWITCHER® high-efficiency 3A step-down voltage regulator manufactured by National Semiconductor. It operates with an input voltage range of 8V to 40V and provides a fixed 3.3V output at up to 3A. The device utilizes a 260kHz switching frequency and employs a buck topology without synchronous rectification. It is housed in a 14-VSON (6x5) package with a DFN exposed pad, suitable for surface mount installation. The component supports a junction temperature range from -40°C to 125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a power switch rated for 3A continuous load current within a compact footprint
• Features internal frequency compensation and a fixed-frequency oscillator to minimize external component count
• Includes comprehensive protection mechanisms such as cycle-by-cycle current limiting and thermal shutdown

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for embedded systems
• Efficient replacement for linear regulators in battery-powered applications
• General-purpose DC/DC conversion in industrial equipment

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix and manufacturer origin, as this part was originally produced by National Semiconductor before its acquisition by Texas Instruments. Confirm RoHS compliance status and check for active production or obsolescence notices, as availability varies significantly between original NS stock and TI equivalents. Ensure the package type matches the required PCB layout specifications.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V output is required with up to 3A capacity from an 8V to 40V input source. The 260kHz frequency allows for smaller passive components compared to lower-frequency alternatives. Consider the thermal performance of the VSON package and ensure adequate copper area on the PCB for heat dissipation given the exposed pad design.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the SIMPLE SWITCHER® family, designed to simplify switching power supply design by requiring minimal external support components. The LM2676 series offers a high-efficiency alternative to traditional three-terminal linear regulators, substantially reducing heat sink requirements and overall system size.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

The LM2676SD-3.3/NOPB is a documented equivalent from Texas Instruments featuring the same electrical characteristics and pinout.