LM3671MFX-1.25

Voltage Regulators - DC DC Switching Regulators Overview

The LM3671MFX-1.25/NOPB is a synchronous step-down DC-DC converter from Texas Instruments, housed in an SOT-23-5 package. It delivers a fixed output voltage of 1.25 V with a maximum load current of 600 mA. The device operates within an input voltage range of 2.7 V to 5.5 V and features a typical switching frequency of 2.6 MHz. It supports an operating temperature range of -40°C to +85°C and includes protection against overcurrent and thermal shutdown.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Intelligent automatic switching between PWM low-noise mode and PFM low-current mode for optimized system control across varying load conditions.
• Internal synchronous rectification ensures high energy efficiency during PWM operation while maintaining compact external component requirements.
• Integrated safety mechanisms include internal soft start, overcurrent protection, and thermal shutdown to ensure reliable operation.

Voltage Regulators - DC DC Switching Regulators Applications

• Powering low-voltage circuits in mobile phones and similar portable consumer electronics
• Supplying power to battery-operated systems requiring efficient single-cell lithium-ion regulation
• Portable computing devices such as handheld PCs and MP3 players

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix configuration when ordering, as the NOPB designation indicates lead-free and RoHS compliance. Confirm the exact package variant matches the design footprint, as the MFX suffix corresponds to the SOT-23-5 form factor. Cross-reference the manufacturer datasheet for the latest assembly and sourcing notices to ensure supply chain continuity and material consistency.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component for applications requiring a fixed 1.25 V rail from a 2.7 V to 5.5 V source. The 2.6 MHz switching frequency allows for smaller passive components compared to lower-frequency alternatives. Ensure the thermal environment stays within the specified -40°C to +85°C range and that the load current does not exceed the 600 mA limit to maintain performance integrity.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM3671 family of 2 MHz, 600 mA buck converters designed for portable devices. It offers fixed voltage options alongside adjustable versions, providing flexibility for various digital core voltages. The series is characterized by its small footprint and ability to operate efficiently from single-cell lithium-ion batteries, making it suitable for space-constrained mobile designs.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing circuit layouts if considering alternative regulators from the same or different families.