LM2678SX-12/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2678SX-12/NOPB is a SIMPLE SWITCHER step-down voltage regulator from Texas Instruments, housed in a TO-263-7 surface-mount package. It operates with an input voltage range of 8 V to 40 V and provides a fixed 12 V output at up to 5 A load current. The device integrates a DMOS power switch for high efficiency exceeding 90% and features a fixed switching frequency of 260 kHz. It includes thermal shutdown and current limit protection, functioning within a junction temperature range of -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a low on-resistance DMOS power switch to achieve high conversion efficiency.
• Includes built-in thermal shutdown and cycle-by-cycle current limiting for robust operation.
• Utilizes a fixed 260 kHz switching frequency to minimize external component size.

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for embedded systems
• Battery-powered equipment requiring efficient step-down conversion
• Industrial control system power supplies

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the suffix 'NOPB' confirms lead-free and RoHS compliance as per Texas Instruments specifications. Confirm the 'SX' designation corresponds to the TO-263-7 surface-mount package variant. Ensure the '-12' identifier matches the required 12 V fixed output voltage. Cross-reference the manufacturer part number against official TI databases to validate authenticity and current production status before procurement.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 12 V output is required from an 8 V to 40 V input source. It is suitable for designs needing up to 5 A continuous current with minimal external passive components. Consider the TO-263-7 package for adequate thermal dissipation in space-constrained applications. Verify that the 260 kHz switching frequency aligns with electromagnetic interference constraints and inductor selection requirements.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM2678 series of SIMPLE SWITCHER regulators, designed for high-efficiency buck conversion. The series offers various fixed voltage options and adjustable variants, sharing common internal architecture and protection features. The LM2678SX-12/NOPB specifically targets applications requiring a stable 12 V rail with high current capability in a compact surface-mount form factor.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2678SX-12/NOPB is the direct equivalent of LM2678SX-12. Other pin-compatible variants include LM2678SX-3.3/NOPB (3.3 V) and LM2678SX-5.0/NOPB (5.0 V). For through-hole applications, the LM2678T-12/NOPB in TO-220-7 serves as a mechanical alternative.