LM2677SX-ADJ/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2677SX-ADJ/NOPB is a high-efficiency, monolithic integrated circuit designed as a step-down switching voltage regulator. It provides adjustable output voltages ranging from 1.2 V to 37 V with a maximum output current of 5 A. The device operates at a fixed switching frequency of 260 kHz and accepts input supply voltages up to 40 V. It utilizes a TO-263-7 (TO-263) surface-mount package and supports an operating junction temperature range from -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated power switch capable of delivering up to 5 A load current
• Fixed 260 kHz switching frequency for reduced passive component size
• Adjustable output voltage control via external resistor network
• Built-in thermal shutdown and current limit protection

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 wide input voltage ranges
• Telecommunications infrastructure power supplies

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'SX' against official Texas Instruments documentation to confirm it denotes the tape-and-reel packaging variant rather than the tube-packaged 'S' version. Ensure the NOPB designation confirms lead-free and RoHS compliance status. Cross-reference the exact part number on the manufacturer's website to validate current production status and availability before procurement.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a 5 A buck converter is required with an input voltage up to 40 V. The adjustable output feature allows flexibility for various system rails between 1.2 V and 37 V. Consider the TO-263-7 package for adequate thermal dissipation in space-constrained applications without requiring large heatsinks. Verify that the 260 kHz frequency aligns with EMI requirements and inductor selection constraints.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the SIMPLE SWITCHER family of regulators from Texas Instruments. It shares core architecture with other LM267x series devices but is distinguished by its 5 A current rating and specific package configuration. The LM2677 series is designed to simplify power supply design by integrating the power switch and control logic into a single monolithic IC.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Official substitutes include LM2677S-ADJ/NOPB for tube packaging or LM2677MX-ADJ/NOPB for MSOP-10 package variants. Verify pin compatibility and thermal performance differences when substituting packages. Consult the latest TI datasheet for any functional differences between legacy and current revisions.