LM2677SDX-ADJ/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2677SDX-ADJ/NOPB is a SIMPLE SWITCHER® high-efficiency 5A step-down voltage regulator from Texas Instruments. It operates with an input voltage range of 8V to 40V and provides an adjustable output voltage between 1.2V and 37V. The device utilizes a fixed switching frequency of 260kHz and features a TO-263-7 (PowerPAD™) package for surface mount installation. It supports operation temperatures from -40°C to +125°C, includes internal current limiting, thermal shutdown, and a 4.2mA quiescent current.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated power switch capable of delivering up to 5A load current
• Fixed 260kHz switching frequency minimizes external component size
• Built-in thermal shutdown and current limit protection

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for industrial equipment
• On-board DC/DC conversion in embedded systems
• Battery-powered applications requiring efficient step-down

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the suffix 'NOPB' confirms lead-free and RoHS compliance as per Texas Instruments specifications. Confirm the 'SDX' designation indicates tape-and-reel packaging rather than tube. Ensure the ADJ variant matches the required output voltage range. Cross-reference the datasheet revision date to confirm pinout and electrical characteristics have not changed.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a 5A buck converter is needed with an input voltage up to 40V. The adjustable output allows flexibility for various system rails. The TO-263-7 package offers superior thermal performance compared to smaller packages. Consider the 260kHz frequency trade-off between component size and efficiency at light loads.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2677 series of SIMPLE SWITCHER regulators. It is distinct from the LM2676 (3A) and LM2678 (5A VSON) variants primarily by its current rating and package type. The series is designed for high-efficiency step-down conversion with minimal external components.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2677S-ADJ/NOPB: Same function but in TO-263-7 tube packaging instead of tape-and-reel. LM2677T-ADJ/NOPB: Through-hole TO-220 package version. LM2678SDX-ADJ/NOPB: 5A current rating but in VSON-14 package.