LM3671MF-1.8/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM3671MF-1.8/NOPB is a fixed-output synchronous buck DC-DC converter from Texas Instruments, providing a regulated 1.8V output at up to 600mA. It operates within an input voltage range of 2.7V to 5.5V and features a typical switching frequency of 2MHz. The device integrates internal power switches and offers a typical quiescent current of 16µA in PFM mode, reducing to 0.01µA in shutdown. Packaged in a compact SOT-23-5 (SC-74A) footprint, it supports surface-mount installation and functions across a temperature range of -40°C to +85°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates synchronous rectification for high efficiency during PWM operation
• Automatically transitions between low-noise PWM and low-current PFM modes
• Includes internal soft-start, overcurrent protection, and thermal shutdown

Voltage Regulators - DC DC Switching Regulators Applications

• Powering low-voltage circuits from single-cell lithium-ion batteries
• Portable mobile phone systems and similar handheld devices
• Battery-operated consumer electronics requiring minimal external components

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'NOPB' confirms lead-free and RoHS compliance status as per manufacturer documentation. Confirm the 'MF' package designation corresponds to the SOT-23-5 form factor required for your PCB layout. Ensure the fixed 1.8V output variant matches your system voltage requirements, as adjustable versions exist within the same family.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 1.8V rail is required with a maximum load of 600mA. It is suitable for designs prioritizing small board space due to the SOT-23-5 package and minimal external component count. Consider the 2MHz switching frequency for compatibility with standard inductor values and noise constraints in portable applications.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM3671 series of step-down DC-DC converters optimized for portable equipment. Unlike automotive-grade variants such as the LM3671-Q1, this commercial version is rated for industrial temperatures up to 85°C. It shares core architecture with other fixed-output models like the LM3671MF-1.25/NOPB but provides a distinct voltage setting.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct functional substitutes include other LM3671MF fixed-output variants with different voltage settings, such as LM3671MF-1.25/NOPB or LM3671MF-1.875/NOPB, provided the voltage requirement changes. Cross-family replacements require matching input/output specifications and package dimensions.