LM2678SX-ADJ/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2678SX-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 an adjustable output voltage from 1.21V to 37V. The device supports a maximum output current of 5A with a fixed switching frequency of 260kHz. It utilizes a TO-263-7 surface-mount package and functions within a junction temperature range of -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a high-efficiency DMOS power switch for low conduction losses
• Includes internal frequency compensation to minimize external component count
• Features thermal shutdown and current limit protection for system reliability

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for embedded systems
• Battery-powered equipment requiring efficient step-down conversion
• Industrial control systems operating at elevated temperatures

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'SX' confirms the TO-263-7 surface mount package variant. Confirm 'NOPB' indicates lead-free and RoHS compliance status. Ensure the 'ADJ' designation matches the requirement for an adjustable output voltage configuration rather than a fixed voltage version. Cross-reference the manufacturer part number against official Texas Instruments documentation to validate authenticity and revision level before procurement.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when an input voltage up to 40V must be stepped down to an adjustable level below 37V. It is suitable for designs requiring up to 5A of continuous load current. The choice depends on the need for a single-inductor buck topology with minimal external components. Consider the thermal performance requirements associated with the TO-263-7 package for the expected power dissipation.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2678 series of SIMPLE SWITCHER regulators, which are designed for high-efficiency power conversion. The series includes fixed voltage variants alongside the adjustable model. The SX suffix specifically denotes the surface-mount D2PAK (TO-263) package format, distinguishing it from through-hole or smaller footprint alternatives within the same functional family.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2678S-ADJ/NOPB: Identical electrical specifications in a standard TO-263 package.

Voltage Regulators - DC DC Switching Regulators FAQ

What is the maximum input voltage for the LM2678SX-ADJ/NOPB?

The maximum input voltage is 40V.

Does this regulator include internal feedback resistors?

No, the adjustable version requires external resistors to set the output voltage.