LM3671MFX-1.375

Voltage Regulators - DC DC Switching Regulators Overview

The LM3671MFX-1.375 is a fixed-output synchronous step-down DC-DC converter manufactured by Texas Instruments, designed for portable applications requiring efficient power management from single-cell lithium-ion batteries. It operates within an input voltage range of 2.7 V to 5.5 V and provides a fixed output voltage of 1.375 V with a maximum load current capability of 600 mA. The device utilizes a typical switching frequency of 2 MHz, enabling the use of compact external components. It features automatic transition between pulse-width modulation (PWM) and pulse-frequency modulation (PFM) modes to optimize efficiency across varying load conditions.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Intelligent mode switching between low-noise PWM and low-current PFM operations to enhance system control and extend battery life during light loads.
• Internal synchronous rectification ensures high energy conversion efficiency throughout the operational duty cycle.
• Integrated protection mechanisms include internal soft-start, current overload limiting, and thermal shutdown to safeguard circuit integrity.

Voltage Regulators - DC DC Switching Regulators Applications

• Power supply circuits in mobile phones and similar portable communication devices
• Voltage regulation for portable hard disk drives and handheld computers
• Powering MP3 players, digital cameras, and other consumer electronics
• Automotive electronic systems requiring robust voltage conversion

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix against the manufacturer's official datasheet to confirm the fixed output voltage and package type. Ensure compatibility with RoHS standards if required by your region. Confirm that the SOT-23-5 footprint matches your PCB layout constraints. Cross-reference the part number with authorized distributors to validate authenticity and availability status before finalizing procurement decisions.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when designing space-constrained portable systems powered by single-cell lithium-ion batteries. It is suitable for applications needing a stable 1.375 V rail with up to 600 mA current demand. Consider its 2 MHz switching frequency for minimizing passive component size. Evaluate the trade-off between the low quiescent current in PFM mode and the noise performance in PWM mode based on your specific signal sensitivity requirements.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM3671 family of step-down converters from Texas Instruments, originally developed by National Semiconductor. The family is characterized by its integration of synchronous rectifiers and intelligent mode control in a small SOT-23-5 package. It serves as a solution for low-power, high-efficiency voltage regulation in battery-operated devices where board space and battery longevity are critical design parameters.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Compatible substitutes within the same family include LM3671MFX-1.8/NOPB and LM3671MFX-1.25/NOPB, provided the fixed output voltage difference is acceptable for the target application. For adjustable output requirements, the LM3671MFX-ADJ variant may be considered. Verify pinout compatibility and thermal characteristics when substituting.