LM2678SD-ADJ

Voltage Regulators - DC DC Switching Regulators Overview

The LM2678SD-ADJ is a monolithic integrated circuit from the SIMPLE SWITCHER series, functioning as a high-efficiency 5-A step-down voltage regulator. It operates with an input voltage range of 8 V to 40 V and provides an adjustable output voltage. The device utilizes a low on-resistance DMOS power switch to achieve efficiency exceeding 90%. Key electrical parameters include a switching frequency of 260 kHz, a maximum output current of 5 A, and a quiescent current of 4.2 mA. It supports a wide operating temperature range from -40 °C to +125 °C and is housed in a VSON-14 surface-mount package.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates all active functions for a buck converter topology within a single IC.
• Utilizes low on-resistance DMOS technology to maintain high conversion efficiency.
• Features built-in thermal shutdown and current limit protection mechanisms.

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation in embedded control systems
• High-efficiency DC/DC conversion for battery-powered devices
• General-purpose step-down voltage regulation

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer origin, as National Semiconductor assets were acquired by Texas Instruments. Confirm the specific suffix (e.g., NOPB) indicates lead-free compliance and RoHS status. Ensure the package type matches the required VSON-14 footprint for PCB layout compatibility. Cross-reference datasheet revisions to confirm pinout consistency.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 5-A capacity buck converter is required with an adjustable output voltage. It is suitable for applications demanding high efficiency (>90%) and wide input voltage ranges up to 40 V. Consider the VSON-14 package size constraints and the need for external feedback resistors to set the desired output voltage level.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2678 family of SIMPLE SWITCHER regulators, which includes fixed output variants (3.3V, 5V, 12V) and other adjustable versions. The SD suffix denotes the VSON-14 package, distinguishing it from TO-263 (S) or DPAK (SX) packages within the same functional family.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2678SDX-ADJ/NOPB

Voltage Regulators - DC DC Switching Regulators FAQ

What is the switching frequency of the LM2678SD-ADJ?

The device operates at a fixed switching frequency of 260 kHz.

Does the LM2678SD-ADJ support synchronous rectification?

No, the standard LM2678 uses a DMOS power switch and does not feature synchronous rectification; the LM2677 variant offers synchronization capabilities.