LM2677SX-5.0

Voltage Regulators - DC DC Switching Regulators Overview

The LM2677SX-5.0/NOPB is a SIMPLE SWITCHER high-efficiency 5A step-down voltage regulator from Texas Instruments, operating at a fixed 260 kHz switching frequency. It accepts an input voltage range of 8 V to 40 V and provides a fixed 5.0 V output with up to 5 A load current. The device utilizes a TO-263-7 (PowerPAD) surface-mount package for thermal performance. It features internal frequency compensation, a 1.23 V reference, and operates within a junction temperature range of -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated power switch rated for 5 A continuous output current
• Fixed 260 kHz switching frequency enables compact external component sizing
• Internal frequency compensation simplifies design implementation
• Built-in thermal shutdown protects against overheating

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for embedded systems
• Distributed power architectures requiring high efficiency
• Battery-powered equipment with wide input voltage ranges

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the suffix 'NOPB' indicates lead-free/RoHS compliance. Confirm the 'SX' designation corresponds to the TO-263-7 PowerPAD package. Ensure the '-5.0' variant matches the required fixed 5.0 V output specification rather than adjustable or other fixed voltage options.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this part when a fixed 5 V output is required with up to 5 A capacity. The 260 kHz frequency allows smaller inductors compared to lower-frequency regulators. Verify that the input voltage remains above 8 V and that the thermal requirements are met by the TO-263-7 package's heat dissipation capabilities.

Voltage Regulators - DC DC Switching Regulators Part Context

This component belongs to the LM2677 series of SIMPLE SWITCHER regulators. It shares the same topology and control architecture as the adjustable LM2677SX-ADJ but provides a fixed 5.0 V output. It is distinct from the 3A LM2676 series and the higher-current LM2678 series.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2677SX-5.0/NOPB is the direct lead-free replacement for the older LM2677SX-5.0. Cross-reference with LM2677T-5.0 for through-hole TO-220 applications if package change is acceptable.