LM2679SX-12/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2679SX-12/NOPB is a SIMPLE SWITCHER® step-down voltage regulator manufactured by Texas Instruments. It operates with an input voltage range of 8 V to 40 V and provides a fixed output voltage of 12 V. The device supports a maximum output current of 5 A and utilizes a buck topology. Key electrical parameters include a switching frequency of 260 kHz, a quiescent current of 4.2 mA, and one output channel. It is housed in a TO-263-7 package for surface mount installation and functions within a temperature range of -40 °C to +125 °C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a high-efficiency DMOS power switch to minimize conduction losses
• Features a fixed-frequency oscillator allowing the use of compact external components
• Includes programmable current limiting and thermal shutdown protection

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for embedded systems
• Efficient pre-regulators for linear voltage regulators
• Battery charger circuits

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'SX' against the manufacturer's official datasheet to confirm the exact tape-and-reel packaging configuration and lead-free status. Ensure the component matches the required TO-263-7 footprint dimensions for PCB layout compatibility. Cross-reference the NOPB designation to confirm RoHS compliance and absence of specific halogenated substances as defined in the latest product change notifications.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this model when a fixed 12 V output is required from an 8 V to 40 V input source. It is suitable for designs needing up to 5 A continuous load current without requiring adjustable feedback networks. Consider the TO-263-7 package for adequate thermal dissipation in space-constrained applications where surface mounting is preferred over through-hole alternatives.

Voltage Regulators - DC DC Switching Regulators Part Context

This component belongs to the LM2679 series of SIMPLE SWITCHER® regulators, which are designed for high-efficiency DC-DC conversion. The series includes both adjustable and fixed-output variants, sharing common internal architectures such as the 260 kHz oscillator and integrated power switch. The LM2679SX-12/NOPB specifically targets applications requiring a stable 12 V rail with minimal external component count.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2679S-12/NOPB (TO-263-8 variant)

Voltage Regulators - DC DC Switching Regulators FAQ

Does the LM2679SX-12/NOPB support synchronous rectification?

No, the LM2679SX-12/NOPB uses a non-synchronous buck topology with an integrated DMOS power switch.

What is the purpose of the soft-start feature in this regulator?

The soft-start function limits the inrush current during startup by gradually ramping up the output voltage, protecting the input source and downstream components.