LM22678QTJ-ADJ/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM22678QTJ-ADJ/NOPB is a SIMPLE SWITCHER® step-down voltage regulator manufactured by Texas Instruments. It integrates a 7A N-channel MOSFET and operates at a fixed switching frequency of 2.95MHz. The device supports an input voltage range from 4.5V to 40V, delivering an adjustable output voltage between 1.21V and 37V with a maximum output current of 7A. It utilizes a TO-263-7 (D2PAK) surface-mount package for efficient thermal dissipation. The component features internal compensation, eliminating the need for external phase-compensation networks, and includes comprehensive protection mechanisms such as cycle-by-cycle current limiting, thermal shutdown, and soft-start functionality.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a high-current 7A N-channel power switch within a compact D2PAK package for robust power delivery.
• Utilizes a fixed 2.95MHz switching frequency architecture to minimize passive component size while maintaining stable regulation.
• Features internally compensated voltage-mode control that ensures stability without requiring external phase-compensation components.
• Includes built-in protection circuits including thermal shutdown, cycle-by-cycle current limiting, and controlled soft-start.

Voltage Regulators - DC DC Switching Regulators Applications

• Industrial controllers and PLCs requiring reliable mid-range power conversion
• Embedded systems with space-constrained PCB layouts needing high current density
• Communication backplanes and server infrastructure power distribution
• Automotive auxiliary power supplies and sensor modules

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix QTJ corresponds to the TO-263-7 package variant when sourcing. Confirm AEC-Q100 qualification status if automotive compliance is required. Ensure the ADJ designation matches the need for programmable output voltage rather than fixed options. Cross-reference datasheet revisions to confirm pinout compatibility with existing designs.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when system requirements demand up to 7A continuous current in a single-phase buck topology. The 2.95MHz frequency allows for smaller inductors compared to lower-frequency alternatives. Consider the TO-263-7 package for its superior thermal performance over smaller SMD packages. Verify that the input voltage range covers the maximum supply rail and that the output voltage adjustment range meets load specifications.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2267x series of SIMPLE SWITCHER regulators, which are designed for high-efficiency DC-DC conversion. The series differentiates models primarily by output current capability and switching frequency. The LM22678 specifically targets applications requiring higher current density than the 3A or 5A variants, offering a balance between performance and component count through integrated power switches.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM22678MX/NOPB: Same electrical specifications but in an SO-PowerPAD-8 package; verify thermal requirements.

Voltage Regulators - DC DC Switching Regulators FAQ

Does the LM22678 require external compensation?

No, the device features internally compensated voltage-mode control, eliminating the need for external phase-compensation networks.

What is the switching frequency of this regulator?

The LM22678 operates at a fixed switching frequency of 2.95MHz.