LM3671MF-ADJ/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM3671MF-ADJ/NOPB is a synchronous step-down DC-DC converter from Texas Instruments, housed in an SOT-23-5 package. It operates with an input voltage range of 2.7 V to 5.5 V and provides an adjustable output voltage between 1.1 V and 3.3 V. The device delivers a maximum output current of 600 mA with a typical switching frequency of 2 MHz. Key electrical parameters include a typical quiescent current of 16 µA and a shutdown current of 0.01 µA. It functions within a temperature range of -40°C to +85°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Intelligent automatic switching between Pulse Width Modulation (PWM) and Pulse Frequency Modulation (PFM) modes to optimize efficiency across varying load conditions.
• Internal synchronous rectification architecture ensures high energy conversion efficiency during PWM operation.
• Requires only three external surface-mount components for implementation: one inductor and two ceramic capacitors.

Voltage Regulators - DC DC Switching Regulators Applications

• Portable mobile phones and similar handheld communication devices
• Personal digital assistants (PDAs) and掌上电脑 systems
• MP3 players and portable media devices
• Digital cameras and imaging equipment

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 physical footprint required for your PCB layout. Ensure the ADJ variant matches the desired adjustable voltage configuration rather than fixed output options.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when designing space-constrained portable electronics requiring efficient power management from single-cell lithium batteries. The adjustable output allows flexibility for various core voltages. Consider the 2 MHz switching frequency for minimizing passive component size while balancing electromagnetic interference requirements against lower frequency alternatives.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM3671 family of low-power step-down converters designed for battery-operated applications. It serves as a direct replacement for the discontinued LM3671MF-ADJ model. The series is characterized by its ability to operate efficiently from a single lithium-ion cell, making it suitable for modern compact consumer electronics where board space and battery life are critical constraints.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

The LM3671MF-ADJ is obsolete; use LM3671MF-ADJ/NOPB or LM3671MFX-ADJ/NOPB as confirmed substitutes. Verify pin compatibility and thermal performance when transitioning from older non-NOPB versions to ensure design continuity.

Voltage Regulators - DC DC Switching Regulators FAQ

How does the device manage efficiency at light loads?

It automatically switches to Pulse Frequency Modulation (PFM) mode under light loads, reducing the typical quiescent current to 16 µA to extend battery life.

What is the minimum number of external components required?

Only three external surface-mount components are needed: one inductor and two ceramic capacitors.