LM3671MFX-1.6

Voltage Regulators - DC DC Switching Regulators Overview

The LM3671MFX-1.6/NOPB is a synchronous step-down DC-DC converter manufactured by Texas Instruments, designed for portable applications. It operates with an input voltage range of 2.7 V to 5.5 V and provides a fixed output voltage of 1.6 V. The device delivers a maximum load current of 600 mA. It features a typical switching frequency of 2 MHz, allowing for the use of small external components. The quiescent current is typically 16 µA in PFM mode, reducing to 0.01 µA in shutdown. It is housed in a SOT-23-5 package and supports an operating temperature range from -40°C to +85°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Intelligent automatic switching between PWM low-noise mode and PFM low-current mode to optimize efficiency across varying load conditions.
• Internal synchronous rectification ensures high energy efficiency during PWM operation.
• High 2 MHz switching frequency enables the use of miniature surface-mount inductors and capacitors.
• Integrated protection mechanisms include current overload limiting and thermal shutdown.

Voltage Regulators - DC DC Switching Regulators Applications

• Powering low-voltage circuits in mobile phones
• Portable consumer electronics systems
• Battery-powered devices requiring efficient step-down conversion

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the complete part number includes the suffix /NOPB to confirm lead-free and RoHS compliance status as per manufacturer specifications. Confirm the specific output voltage variant matches the design requirement, as the LM3671 series offers multiple fixed voltage options. Ensure the ordering suffix indicates the correct tape-and-reel packaging configuration for automated assembly processes.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a compact solution is required for converting single-cell battery voltages to lower logic levels. The fixed 1.6 V output eliminates the need for external feedback resistors compared to adjustable versions. Consider the 2 MHz frequency for minimizing passive component size while maintaining acceptable ripple. Verify that the 600 mA current capability meets the peak load demands of the target application circuit.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM3671 family of step-down DC-DC converters optimized for portable equipment. The family shares common architecture including synchronous rectification and auto-mode control. The MFX suffix denotes the SOT-23-5 surface-mount package variant. The LM3671 series is distinct from automotive-qualified variants like the LM3671-Q1, which may have extended temperature ranges or different qualification standards.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Publicly confirmed substitute part numbers for this specific fixed-voltage variant are not available in the provided documentation. For adjustable output requirements, the LM3671MF-ADJ/NOPB serves as a functional alternative within the same family. Designers should verify pin compatibility and thermal performance when considering cross-family replacements.