LM2678T-ADJ

Voltage Regulators - DC DC Switching Regulators Overview

The LM2678T-ADJ/NOPB is a SIMPLE SWITCHER® step-down DC/DC switching regulator manufactured by Texas Instruments. It operates with an input voltage range of 8V to 40V and provides a maximum output current of 5A. The device features an adjustable output voltage ranging from 1.21V to 37V. It utilizes a fixed switching frequency of 260kHz and employs pulse-width modulation control. The component is housed in a TO-220-7 through-hole package with formed leads, designed for high-efficiency power conversion applications.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated monolithic buck converter topology for efficient step-down voltage regulation
• Fixed internal switching frequency eliminates the need for external oscillator components
• Built-in thermal shutdown and current limit protection mechanisms
• Adjustable output voltage capability via external resistor network

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for distributed power architectures
• Pre-regulator stages for downstream linear regulators
• Battery-powered systems requiring efficient voltage stepping
• Industrial equipment power supplies operating within specified voltage ranges

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the complete part number includes the NOPB suffix to ensure compliance with RoHS standards and lead-free manufacturing specifications. Confirm the package variant matches the required mounting style, as the T suffix indicates a specific through-hole configuration. Cross-reference the datasheet revision date to ensure alignment with current design constraints and environmental regulations before finalizing procurement orders.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a robust, high-current buck converter is required for through-hole assembly. The fixed 260kHz frequency allows for the use of smaller passive components compared to lower-frequency alternatives. Ensure the input voltage remains within the 8V to 40V window and that thermal management strategies account for the 5A output capability in the chosen enclosure environment.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM2678 family of SIMPLE SWITCHER regulators, which are known for simplifying power supply design. The family includes fixed voltage variants and different package options such as D2PAK and VSON. The LM2678T-ADJ specifically targets applications needing adjustable output voltages with high efficiency and integrated protection features in a standard through-hole footprint.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct functional substitutes include other LM2678 series variants like the LM2678S-ADJ/NOPB for surface mount requirements or fixed voltage versions such as the LM2678T-5.0/NOPB if a specific output voltage is sufficient. Verify pin compatibility and thermal performance characteristics when transitioning between package types within the same family.