LM3674MFX-1.8/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM3674MFX-1.8/NOPB is a fixed-output step-down DC-DC converter manufactured by Texas Instruments, designed for low-voltage applications powered by single Li-Ion cells or input rails ranging from 2.7 V to 5.5 V. It delivers up to 600 mA of load current across the entire input voltage range within an SOT-23-5 package. The device operates at a typical switching frequency of 2 MHz, enabling the use of minimal external components including one inductor and two ceramic capacitors. Internal synchronous rectification ensures high efficiency during PWM mode operation, while shutdown mode reduces battery consumption to 0.01 µA typically.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Internal synchronous rectification provides high efficiency during PWM mode operation
• Fixed output voltage configuration eliminates external feedback resistor requirements
• Ultra-low shutdown current significantly extends battery life in portable systems
• Compact SOT-23-5 package supports minimal footprint design with few external components

Voltage Regulators - DC DC Switching Regulators Applications

• Mobile phones and similar portable consumer electronics
• Low-voltage circuits powered by single-cell lithium-ion batteries
• Battery-powered handheld devices requiring efficient power management
• Portable systems needing compact step-down conversion solutions

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the complete part number including the suffix /NOPB to confirm lead-free compliance and specific output voltage variant. Confirm package type matches SOT-23-5 requirements for your PCB layout. Check datasheet for thermal performance under expected load conditions. Ensure input voltage stays within the 2.7 V to 5.5 V operational range. Validate component availability through authorized distributors to avoid counterfeit risks.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Choose this model when a fixed 1.8 V output is required without adjustable regulation flexibility. Select for designs prioritizing minimal external component count due to the 2 MHz switching frequency. Consider for space-constrained applications where the SOT-23-5 package offers size advantages. Evaluate if the 600 mA current limit meets peak load demands of the target circuit. Assess compatibility with single-cell lithium-ion battery architectures for optimal efficiency.

Voltage Regulators - DC DC Switching Regulators Part Context

This component belongs to the LM3674 series of step-down DC-DC converters from Texas Instruments. The series includes various fixed output voltage options and adjustable versions to suit different application needs. All variants share common features such as internal synchronous rectification and high switching frequencies for compact designs. The LM3674 family targets portable electronics requiring efficient power management in small form factors.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM3674MFX-1.2/NOPB: Fixed 1.2 V output, same package and current rating. LM3674MFX-1.5/NOPB: Fixed 1.5 V output, same package and current rating. LM3671MFX-1.8/NOPB: Fixed 1.8 V output, higher switching frequency of 2.6 MHz, wider temperature range.