LM3671MFX-1.25/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM3671MFX-1.25/NOPB is a fixed-output synchronous buck converter from Texas Instruments, designed for space-constrained applications. It operates within an input voltage range of 2.7 V to 5.5 V and provides a fixed output of 1.25 V at up to 600 mA. The device integrates a 2.6 MHz switching frequency to minimize external component size while maintaining high efficiency. Key electrical specifications include a quiescent current of 16 µA and a shutdown supply current that supports battery-powered systems. It features thermal shutdown and cycle-by-cycle current limiting for robust protection.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Synchronous step-down topology with integrated power switches
• Fixed 1.25 V output voltage configuration
• Integrated thermal shutdown and current limit protection

Voltage Regulators - DC DC Switching Regulators Applications

• Portable consumer electronics requiring compact power solutions
• Battery-operated devices needing efficient voltage regulation
• Embedded systems utilizing single-cell lithium-ion or lithium-polymer batteries

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the suffix 'NOPB' confirms lead-free and RoHS compliance status as per manufacturer documentation. Confirm the 'MF' package designation matches the required SOT-23-5 footprint for PCB layout compatibility. Ensure the '-1.25' identifier aligns with the specific fixed output voltage requirement of the design. Cross-reference the datasheet revision date to ensure all electrical parameters match the current production version.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 1.25 V rail is required in a minimal footprint. The 2.6 MHz frequency allows for smaller inductors compared to lower-frequency alternatives. Verify that the load current does not exceed the 600 mA continuous rating. Consider the -40°C to +85°C operating temperature range against environmental conditions. Evaluate input voltage stability to ensure it remains within the 2.7 V to 5.5 V operational window.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM3671 family of synchronous DC-DC converters. It shares the same core architecture and pinout with other variants such as the LM3671MF-1.5/NOPB and LM3671MF-ADJ/NOPB. The primary distinction lies in the internal feedback resistor network setting the output voltage. All variants utilize the SOT-23-5 package and support similar input voltage ranges.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM3671MF-1.25/NOPB serves as a direct pin-compatible alternative with identical electrical characteristics.