LM3674MFX-1.2/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM3674MFX-1.2/NOPB is a synchronous step-down DC-DC converter manufactured by Texas Instruments, housed in a compact SOT-23-5 package. 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 up to 600 mA load current. The device utilizes a fixed switching frequency of 2 MHz, enabling the use of small external components. It features internal synchronous rectification for high efficiency and supports automatic transition between Pulse Width Modulation (PWM) and Pulse Frequency Modulation (PFM) modes to optimize light-load performance.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated synchronous rectification ensures high conversion efficiency across the operating load range.
• Fixed 2 MHz switching frequency allows for minimal external component count and reduced solution size.
• Automatic mode selection transitions between PWM and PFM to maintain efficiency under light loads.
• Ultra-low shutdown current significantly reduces battery drain when the system is powered off.

Voltage Regulators - DC DC Switching Regulators Applications

• Powering low-voltage digital circuits from single Li-Ion cell batteries
• Portable mobile phone systems and handheld devices
• Battery-operated consumer electronics requiring compact power solutions

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'MFX' confirms the tape-and-reel packaging format required for automated assembly processes. Confirm that the '-NOPB' designation indicates lead-free and RoHS compliance status as per the manufacturer's latest documentation. Ensure the fixed 1.2 V output aligns with target circuit requirements, as adjustable versions exist within the same family. Check current availability status, as this specific part number may be subject to lifecycle changes or obsolescence notices.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 1.2 V output is required for space-constrained portable applications. The SOT-23-5 package is suitable for designs prioritizing minimal board area over higher current capabilities exceeding 600 mA. Consider the 2 MHz frequency trade-off between component size and electromagnetic interference (EMI) filtering requirements. Verify that the input voltage source remains within the 2.7 V to 5.5 V operational window to ensure stable regulation.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM3674 family of step-down converters designed for mobile and portable systems. It shares architectural similarities with other members like the LM3671 and LM3670 but differs in specific output configurations and feature sets. The LM3674 series is optimized for single-cell lithium-ion battery applications, distinguishing it from broader PMIC families that support multi-rail generation or different input ranges.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult official Texas Instruments resources for cross-reference data or updated product recommendations if this specific variant is discontinued.