LM2678S-3.3/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2678S-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 typical switching frequency of 260 kHz. It is housed in a TO-263 (DPAK) surface-mount package, specifically the 7-pin variant. The component supports operation over an extended temperature range from -40 °C to +125 °C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated high-current power switch enables efficient step-down conversion without external components for basic operation.
• Fixed 3.3 V output configuration simplifies design for standard logic and peripheral power supplies.
• Internal frequency compensation ensures stability across wide load and line variations.
• Thermal shutdown protection safeguards the device during overload or excessive junction temperature conditions.

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for embedded systems requiring 3.3 V rails
• Power supply stages for microprocessors and FPGAs
• Battery-powered equipment utilizing higher voltage sources
• Industrial control system power distribution

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify that the ordering suffix matches NOPB for lead-free and RoHS compliance status. Confirm the package designation S corresponds to the TO-263 form factor required for your PCB layout. Ensure the fixed 3.3 V output aligns with your system voltage requirements, as adjustable variants exist within the same family. Cross-reference the manufacturer part number against official distributor catalogs to avoid counterfeit components.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3 V output is required with up to 5 A capacity from an 8 V to 40 V input source. The TO-263 package offers thermal performance suitable for moderate power dissipation in surface-mount applications. Consider the 260 kHz switching frequency for balancing efficiency and passive component size. This part is appropriate for designs prioritizing simplicity and cost-effectiveness over synchronous rectification benefits.

Voltage Regulators - DC DC Switching Regulators Part Context

The LM2678 series belongs to Texas Instruments' SIMPLE SWITCHER family of monolithic switching regulators. These devices integrate the power switch and control circuitry into a single IC. The LM2678S-3.3/NOPB represents the fixed 3.3 V version in the TO-263 package. It shares core architecture with other output voltage variants and the adjustable version within the same series.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2678S-ADJ/NOPB: Adjustable output variant using the same TO-263 package and electrical characteristics except for output voltage flexibility.