LM3671MFX-3.3/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM3671MFX-3.3/NOPB is a fixed-output step-down DC-DC converter manufactured by Texas Instruments, belonging to the LM3671 series. It operates with an input voltage range of 2.7 V to 5.5 V and provides a fixed output voltage of 3.3 V. The device supports a maximum output current of 600 mA and utilizes a buck topology. It features a switching frequency of 2.6 MHz and is housed in a SOT-23-5 surface-mount package. The component functions within a temperature range of -40°C to +85°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates synchronous rectification for high efficiency across load ranges
• Automatically switches between PWM and PFM modes to optimize light-load performance
• Includes internal protection mechanisms such as overcurrent limiting and thermal shutdown

Voltage Regulators - DC DC Switching Regulators Applications

• Portable electronic devices powered by single-cell lithium-ion batteries
• Cellular phones and mobile communication equipment
• Personal digital assistants (PDAs) and handheld computers
• MP3 players and portable media devices
• Digital cameras and automotive electronics

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'MFX' confirms the SOT-23-5 package type and tape-and-reel shipping configuration. Confirm that 'NOPB' indicates lead-free and RoHS compliance status. Ensure the fixed 3.3 V output variant matches the target circuit requirements, as adjustable or other fixed voltage versions exist within the same family. Cross-reference the manufacturer part number with official distributor catalogs to validate authenticity and current production status.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a compact solution is required for converting higher battery voltages to a stable 3.3 V rail. The 2.6 MHz switching frequency allows for the use of small external inductors and capacitors, reducing overall board space. Consider the 600 mA current limit against peak load demands. The fixed output eliminates the need for external feedback resistors, simplifying the design compared to adjustable variants while maintaining low quiescent current for battery longevity.

Voltage Regulators - DC DC Switching Regulators Part Context

This device is part of the LM3671 family of step-down converters designed for portable applications. It shares core architecture with variants like LM3671MFX-ADJ/NOPB but differs in having a fixed internal feedback network set to 3.3 V. Unlike the DSBGA packaged LM3671TL series, this MFX version utilizes the SOT-23-5 footprint, offering a different mechanical profile for PCB layout constraints.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM3671MF-3.3/NOPB serves as a pin-compatible alternative with the same electrical specifications but utilizes the SC-74A/SOT-753 package instead of SOT-23-5.