LM3671MF-1.25/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM3671MF-1.25/NOPB is a fixed-output synchronous buck DC-DC converter from Texas Instruments, delivering a regulated 1.25 V output at up to 600 mA. It operates within an input voltage range of 2.7 V to 5.5 V and features a switching frequency of 2.6 MHz. The device incorporates automatic PFM/PWM mode transition for efficiency optimization across load conditions. It includes integrated soft-start, overcurrent protection, and thermal shutdown. Packaged in a compact SOT-23-5 footprint, it supports surface-mount installation with an operating temperature range of -40°C to +85°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Synchronous step-down topology with integrated high-side and low-side MOSFETs
• Automatic transition between pulse-frequency modulation and pulse-width modulation modes
• Integrated protection mechanisms including overcurrent limiting and thermal shutdown

Voltage Regulators - DC DC Switching Regulators Applications

• Portable battery-powered consumer electronics
• Embedded systems requiring efficient voltage regulation
• Industrial control modules with single-supply operation

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the suffix NOPB indicates lead-free compliance and RoHS adherence per manufacturer specifications. Confirm the MF package variant matches your PCB footprint requirements. Ensure input capacitors support the 2.6 MHz switching frequency to maintain stability. Cross-reference the datasheet for recommended external component values to guarantee performance within the specified electrical parameters.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 1.25 V rail is required from a 2.7 V to 5.5 V source. The 600 mA current capability suits moderate-load applications. Consider the SOT-23-5 package size constraints against available board space. Evaluate the 2.6 MHz frequency impact on passive component selection versus lower-frequency alternatives in the LM3671 family.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM3671 series of synchronous buck converters. Variants such as LM3671MF-1.5/NOPB or LM3671MFX-3.3/NOPB share identical pinouts and control logic but differ in fixed output voltages. The series emphasizes high efficiency and small solution size for portable applications.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM3671MF-1.5/NOPB provides a 1.5 V output instead of 1.25 V. LM3671MFX-1.25/NOPB offers the same 1.25 V output but in an X-package variant. Verify voltage compatibility before substitution.