LM3674MF-1.8

Voltage Regulators - DC DC Switching Regulators Overview

The LM3674MF-1.8 is a fixed-output step-down DC-DC converter manufactured by Texas Instruments, designed for low-voltage applications powered by single Li-Ion cells or input rails ranging from 2.7V to 5.5V. It delivers a maximum load current of 600mA with a fixed output voltage of 1.8V. The device operates at a typical switching frequency of 2MHz and utilizes internal synchronous rectification for high efficiency. It is housed in an SOT-23-5 package and supports surface-mount installation.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Internal synchronous rectification ensures high efficiency during PWM mode operation.
• Fixed 2MHz switching frequency allows the use of minimal external components.
• Integrated soft start limits inrush current during startup.
• Shutdown mode reduces battery consumption to a typical value of 0.01 µA.

Voltage Regulators - DC DC Switching Regulators Applications

• Mobile phones
• Portable systems
• Low voltage circuit powering

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'NOPB' indicates lead-free compliance when sourcing. Confirm the 'MFX' designation corresponds to the SOT-23-5 package variant. Ensure the fixed 1.8V output matches the target design requirements, as adjustable versions exist within the same family. Cross-reference datasheet revisions for any pinout or electrical specification updates prior to final implementation.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a compact solution is required for 1.8V logic or memory power supplies. The 2MHz frequency enables smaller passive components compared to lower-frequency alternatives. Verify that the 600mA current limit meets the peak load demands of the application. Consider thermal performance in the SOT-23-5 package under continuous load conditions.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM3674 series of step-down converters optimized for portable electronics. It shares architectural similarities with the LM3671 but offers specific fixed voltage options. The series is characterized by its small footprint and high efficiency, making it suitable for space-constrained mobile devices requiring stable power delivery from lithium-ion sources.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM3674MF-1.2/NOPB provides a 1.2V fixed output. LM3674MF-1.5/NOPB provides a 1.5V fixed output. LM3674MX-1.8/NOPB offers the same 1.8V output in an MX package variant. LM3671MFX-1.8/NOPB is a similar 600mA buck converter with a slightly different switching frequency profile.