LM3671MF-ADJ

Voltage Regulators - DC DC Switching Regulators Overview

The LM3671MF-ADJ is a discontinued step-down DC-DC converter manufactured by Texas Instruments. It operates with an input voltage range of 2.7 V to 5.5 V and provides an adjustable output voltage from 1.1 V to 3.3 V. The device supports a maximum output current of 600 mA and features a typical switching frequency of 2 MHz. Packaged in a SOT-23-5 (SC-74A) surface-mount format, it functions within a temperature range of -40°C to +85°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Automatically switches between PWM low-noise mode and PFM low-current mode to optimize efficiency and extend battery life.
• Integrates synchronous rectification for high energy conversion efficiency during PWM operation.
• Includes internal protection mechanisms such as soft start, overcurrent protection, and thermal shutdown.

Voltage Regulators - DC DC Switching Regulators Applications

• Mobile phones
• Portable hard drives
• MP3 players
• Digital cameras
• Handheld trading terminals

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify component status carefully as the LM3671MF-ADJ is officially listed as obsolete and no longer manufactured. Confirm availability through authorized distributors or secondary markets. Ensure replacement options like the LM3671MF-ADJ/NOPB are evaluated for pin compatibility and electrical equivalence before integration into new designs.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component only for legacy system maintenance or repair where original specifications must be strictly maintained. For new designs, consider active alternatives within the LM3671 family that offer identical electrical characteristics and package dimensions. Verify that the adjustable output configuration meets the specific voltage requirements of the target circuit without requiring excessive external feedback resistance.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM3671 series of 2 MHz, 600 mA step-down DC-DC converters designed for portable applications. It is optimized for single-cell lithium-ion battery systems. The series includes fixed voltage variants and adjustable versions, all sharing common topology and protection features suitable for space-constrained mobile devices.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Public confirmed substitute part numbers include LM3671MF-ADJ/NOPB and LM3671MFX-ADJ/NOPB. These equivalents maintain the same functional parameters and package style while being currently in production.