LM2679SX-3.3/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2679SX-3.3/NOPB is a SIMPLE SWITCHER® 5A step-down voltage regulator manufactured by Texas Instruments. It operates with an input voltage range of 8V to 40V and provides a fixed output voltage of 3.3V. The device features a switching frequency of 260kHz, a maximum output current of 5A, and a quiescent current of 4.2mA. It utilizes a VSON-14 surface-mount package and supports an operating temperature range from -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated low on-resistance DMOS power switch enables high efficiency exceeding 90% across various load conditions.
• Fixed 260kHz internal oscillator allows for the use of compact external components while minimizing electromagnetic interference.
• Built-in thermal shutdown and adjustable current limit protection safeguard the device and load during fault conditions.

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation in distributed power supply architectures
• Efficient pre-regulators for linear post-regulator systems
• Battery-powered equipment requiring high-efficiency step-down conversion

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'SX' confirms the VSON-14 package variant rather than TO-263 or TO-220 versions. Confirm the 'NOPB' designation indicates lead-free and RoHS compliance status as per the manufacturer's latest documentation. Ensure the fixed 3.3V output version matches the design requirement instead of the adjustable counterpart.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V output at up to 5A is required within an 8V to 40V input window. The VSON-14 package suits applications needing a compact surface-mount footprint. Consider the 260kHz frequency trade-off between component size and noise performance relative to other switching frequencies available in the series.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2679 family of SIMPLE SWITCHER regulators, which includes fixed voltage options (3.3V, 5V, 12V) and adjustable variants. The SX suffix specifically denotes the VSON-14 surface-mount package, distinguishing it from the S (TO-263) and T (TO-220) through-hole packages within the same electrical specification family.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the source material. Verify compatibility with existing inductor selections and control loop compensation when considering alternative regulators from different manufacturers or families.