LM2679S-3.3

Voltage Regulators - DC DC Switching Regulators Overview

The LM2679S-3.3/NOPB is a SIMPLE SWITCHER® 5A step-down DC/DC voltage regulator manufactured by Texas Instruments. It operates with an input voltage range of 8V to 40V and provides a fixed 3.3V output at up to 5A. The device utilizes a 260kHz switching frequency, enabling the use of compact external components. It features adjustable current limiting, thermal shutdown, and soft-start capabilities. The component is housed in a TO-263-7 (D2PAK) surface-mount package and supports operation temperatures from -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated 5A power switch for high-current step-down conversion
• Fixed 3.3V output option within the SIMPLE SWITCHER family
• Adjustable peak current limit via external resistor
• Built-in thermal protection and soft-start functionality

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for embedded systems
• Pre-regulator for linear voltage regulators
• Battery charger input conditioning
• General-purpose 5A DC/DC conversion

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the suffix /NOPB indicates RoHS compliance and lead-free construction. Confirm the 'S' designation corresponds to the TO-263-7 package variant. Check manufacturer status as some LM2679 variants are marked not recommended for new designs; ensure availability aligns with long-term supply requirements.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this model when a fixed 3.3V output is required without external feedback resistors. Compare against the ADJ version if variable output is needed. Ensure the TO-263-7 package fits the PCB thermal and spatial constraints. Verify that the 260kHz frequency meets EMI requirements for the specific application environment.

Voltage Regulators - DC DC Switching Regulators Part Context

Part of the LM2679 SIMPLE SWITCHER series, originally developed by National Semiconductor before its acquisition by Texas Instruments. The series includes fixed voltage options (3.3V, 5V, 12V) and an adjustable version. The LM2679S-3.3 specifically targets applications requiring robust 5A performance with minimal external component count.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct replacement: LM2679S-3.3/NOPB. Verify pinout compatibility with legacy LM2679S-3.3 units. Consider LM2679T-3.3/NOPB for through-hole TO-220 requirements.