LM2679SX-5.0

Voltage Regulators - DC DC Switching Regulators Overview

The LM2679SX-5.0/NOPB is a monolithic integrated circuit from the SIMPLE SWITCHER family, functioning as a high-efficiency step-down DC/DC switch regulator. It integrates a power DMOS switch capable of driving up to 5A loads with excellent line and load regulation. The device operates with an input voltage range of 8V to 40V and provides a fixed 5V output. Key electrical parameters include a switching frequency of 260kHz, a maximum static current of 4.2mA, and an operating junction temperature range from -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a low on-resistance DMOS power switch for high efficiency exceeding 90%.
• Features a fixed-frequency internal oscillator allowing for compact external component sizing.
• Includes programmable peak current limiting to protect against overload conditions.
• Incorporates thermal shutdown circuitry to safeguard the device during fault events.

Voltage Regulators - DC DC Switching Regulators Applications

• Efficient pre-regulators for linear voltage regulators
• Battery charging systems
• Post-regulation for bus distribution networks

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the suffix /NOPB indicates lead-free compliance and RoHS adherence. Confirm the package designation SX corresponds to TO-263-7. Ensure the specific revision matches design requirements. Check manufacturer status as some variants may be marked not recommended for new designs.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this part when a fixed 5V output is required from an 8V to 40V input source. The 5A current capability suits moderate power applications. The 260kHz frequency balances size and efficiency. Consider thermal management due to the power dissipation inherent in buck topologies at high currents.

Voltage Regulators - DC DC Switching Regulators Part Context

This component belongs to the LM2679 series of SIMPLE SWITCHER regulators. It shares core architecture with other variants like the adjustable LM2679SX-ADJ and different fixed voltages. The series is characterized by minimal external component count and robust protection features typical of Texas Instruments power management solutions.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct replacements include LM2679SX-5.0/NOPB. Verify pinout compatibility if substituting with older non-NOPB versions or alternative packages like SD or T variants within the same series.

Voltage Regulators - DC DC Switching Regulators FAQ

What is the maximum output current?

The device can drive loads up to 5A.

Is the output voltage adjustable?

No, the LM2679SX-5.0 provides a fixed 5V output. Adjustable versions use the ADJ suffix.