LM2677SX-ADJ

Voltage Regulators - DC DC Switching Regulators Overview

The LM2677SX-ADJ is a high-efficiency 5A step-down switching voltage regulator from the SIMPLE SWITCHER family, manufactured by Texas Instruments following the acquisition of National Semiconductor. It operates with a fixed internal switching frequency of 260 kHz and supports an input voltage range of 8V to 40V. The device provides an adjustable output voltage ranging from 1.2V to 37V with a maximum output current of 5A. It utilizes a TO-263-7 (D2PAK) surface-mount package and functions within a junction temperature range of -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated power switch eliminates the need for external components in standard buck configurations
• Fixed 260 kHz switching frequency enables the use of small passive components
• Internal frequency compensation simplifies design and reduces component count
• Thermal shutdown and current limit protection ensure operational reliability

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 24V or 48V input rails
• Telecommunications infrastructure power distribution

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer designation on the datasheet, as National Semiconductor was acquired by Texas Instruments; current production typically carries the TI brand. Confirm the suffix 'SX' corresponds to the TO-263-7 package variant. Ensure the 'ADJ' designation matches the required adjustable output configuration rather than a fixed voltage version. Cross-reference the specific ordering code with official distributor catalogs to confirm RoHS compliance status and availability.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a 5A output current capability is required with minimal external component count. The fixed 260 kHz frequency allows for smaller inductors and capacitors compared to lower-frequency regulators. Verify that the input voltage remains within the 8V to 40V range and that the thermal requirements for the D2PAK package are met in the final enclosure design. Consider the adjusted output voltage range of 1.2V to 37V against load requirements.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the SIMPLE SWITCHER series, designed for ease of use with minimal external circuitry. It is part of a broader family including fixed-output variants like the LM2677S-12 and lower-current counterparts such as the LM2676. The LM2677 specifically targets applications needing higher current capacity than the 3A LM2676 while maintaining similar footprint and design simplicity.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

• LM2677S-ADJ/NOPB
• LM2677SX-ADJ/NOPB