LM2678T-3.3

Voltage Regulators - DC DC Switching Regulators Overview

The LM2678T-3.3/NOPB is a monolithic integrated circuit step-down DC/DC switching regulator from the SIMPLE SWITCHER family, manufactured by Texas Instruments. It operates with an input voltage range of 8V to 40V and provides a fixed output voltage of 3.3V. The device supports a maximum load current of 5A and utilizes a TO-220-7 through-hole package. Key electrical parameters include a switching frequency of 260kHz, a minimum input voltage of 8V, and a maximum input voltage of 40V. It functions as a non-synchronous buck converter with positive output configuration.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates all active components for a complete step-down switching regulator solution
• Utilizes low on-resistance DMOS power switch for high efficiency operation
• Includes internal compensation for stable performance across operating conditions
• Features thermal shutdown protection to safeguard against overheating

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for digital logic circuits
• Power supply stages for embedded systems
• Battery-powered equipment requiring efficient voltage conversion
• Industrial control system power distribution

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the suffix NOPB indicates lead-free and RoHS compliance when sourcing. Confirm the TO-220-7 package variant matches the required through-hole mounting style. Ensure the fixed 3.3V output specification aligns with the target application requirements rather than adjustable versions.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component for applications requiring a fixed 3.3V output at up to 5A. The TO-220-7 package offers robust thermal dissipation capabilities suitable for higher current loads compared to surface-mount variants. Consider the 260kHz switching frequency when designing external inductor and capacitor values for optimal ripple performance.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2678 series of high-efficiency 5A step-down regulators. It shares core architecture with other variants like the LM2678S and LM2678SD but differs in package type and output configuration. The 'T' suffix denotes the TO-220 through-hole package, while '3.3' specifies the fixed output voltage.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2678T-ADJ/NOPB (Adjustable version)

Voltage Regulators - DC DC Switching Regulators FAQ

What is the maximum input voltage for the LM2678T-3.3?

The maximum input voltage is 40V.

Does the LM2678T-3.3 use synchronous rectification?

No, it uses a non-synchronous topology with an internal DMOS switch.