LM2677S-3.3

Voltage Regulators - DC DC Switching Regulators Overview

The LM2677S-3.3/NOPB is a SIMPLE SWITCHER® step-down DC/DC switching regulator manufactured by Texas Instruments. It operates with an input voltage range of 8 V to 40 V and provides a fixed output voltage of 3.3 V at up to 5 A output current. The device utilizes a buck topology with a standard switching frequency of 260 kHz. It is housed in a TO-263-7 (PowerPAD™) surface-mount package. The component supports operation within a temperature range of -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated high-current power switch rated for 5 A continuous load
• Fixed 3.3 V output option eliminates external feedback resistor networks
• Internal frequency compensation simplifies external component selection

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for embedded systems
• Distribution bus conversion in industrial equipment
• High-efficiency step-down power supplies for telecommunications infrastructure

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the suffix 'NOPB' confirms lead-free and RoHS compliance status. Confirm the package designation 'S' corresponds to the TO-263-7 PowerPAD variant. Ensure the fixed output version matches the required 3.3 V specification rather than adjustable or other fixed voltage variants.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this part when a fixed 3.3 V output is required from an 8–40 V input source. The 5 A current rating suits moderate-to-high power applications. The 260 kHz frequency allows for compact passive components compared to lower-frequency regulators. Verify thermal requirements for the TO-263-7 package under maximum load conditions.

Voltage Regulators - DC DC Switching Regulators Part Context

This component belongs to the LM2677 family of SIMPLE SWITCHER regulators, which are designed for high-efficiency step-down conversion. The family includes adjustable versions and various fixed output voltages. The LM2677 series is characterized by its integrated power switch and simplified design process requiring minimal external components.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2677S-3.3/NOPB serves as a direct functional replacement for LM2677S-3.3. Cross-reference with LM2677SX-3.3 for equivalent performance specifications.