LM3671MFX-1.2

Voltage Regulators - DC DC Switching Regulators Overview

The LM3671MFX-1.2 is a fixed-output step-down DC-DC converter manufactured by Texas Instruments, designed for portable applications. It operates with an input voltage range of 2.7 V to 5.5 V and provides a fixed output voltage of 1.2 V at a maximum load current of 600 mA. The device features a typical switching frequency of 2 MHz, enabling the use of small external components. It incorporates automatic PFM/PWM mode switching to optimize efficiency across varying load conditions, achieving a typical quiescent current of 16 µA in light-load scenarios.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Automatic transition between pulse-width modulation and pulse-frequency modulation modes to balance low-noise performance with high efficiency under light loads.
• Internal synchronous rectification architecture ensures high energy conversion efficiency during active PWM operation periods.
• Integrated protection mechanisms include thermal shutdown and current limiting to safeguard the device and connected circuitry.

Voltage Regulators - DC DC Switching Regulators Applications

• Powering low-voltage digital circuits from single-cell lithium-ion battery sources
• Portable consumer electronics requiring compact power management solutions
• Embedded systems utilizing 2.7 V to 5.5 V input rails

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'MFX' against the manufacturer's official documentation to confirm package type and tape-and-reel specifications. Ensure the fixed 1.2 V output variant matches the target design requirements, as other voltage options exist within the same family. Cross-reference the RoHS compliance status and lead-free designation directly with the latest datasheet revision.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 1.2 V output is required without external feedback resistors. The 2 MHz switching frequency allows for smaller inductors compared to lower-frequency alternatives. Consider the 600 mA current limit for load demands and verify that the SOT-23-5 package fits the available PCB real estate constraints.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM3671 family of step-down converters optimized for mobile devices. It shares core topology and control logic with variants offering different fixed output voltages or adjustable settings. The family is characterized by its ability to operate efficiently from single-cell batteries while maintaining a minimal footprint through high-frequency switching.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM3671MF-1.2/NOPB offers identical electrical characteristics in a standard SOT-23-5 package. LM3671QMF-1.2/NOPB provides automotive-grade qualification (AEC-Q100) with extended temperature ranges. Verify pinout compatibility and thermal performance before substituting.