LM3671MF-1.6

Voltage Regulators - DC DC Switching Regulators Overview

The LM3671MF-1.6/NOPB is a fixed-output step-down DC-DC converter from Texas Instruments, providing a stable 1.6V output with a maximum load current of 600mA. It operates within an input voltage range of 2.7V to 5.5V and features a typical switching frequency of 2MHz. The device utilizes a Buck topology in a compact SOT-23-5 package. Key electrical parameters include a typical quiescent current of 16µA in PFM mode and a shutdown current of 0.01µA. It supports an operating temperature range of -40°C to +85°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Automatically switches between PWM low-noise and PFM low-current modes for optimized efficiency across load ranges.
• Integrates internal synchronous rectification to maximize energy conversion during PWM operation.
• Requires only three external surface-mount components: one inductor and two ceramic capacitors.
• Includes built-in protection mechanisms such as internal soft-start, current overload protection, and thermal shutdown.

Voltage Regulators - DC DC Switching Regulators Applications

• Powering low-voltage circuits from single-cell lithium-ion batteries
• Portable mobile phones and similar handheld communication devices
• Battery-operated consumer electronics requiring high efficiency
• Embedded systems with strict space constraints

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix (e.g., NOPB) to ensure compliance with RoHS standards and lead-free manufacturing requirements. Confirm that the fixed 1.6V output aligns precisely with the target circuit design, as adjustable variants exist within the same family. Ensure the selected packaging format matches assembly capabilities. Cross-reference the manufacturer's latest datasheet for any updates on recommended external component values to guarantee optimal performance under varying load conditions.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 1.6V rail is required from a 2.7V to 5.5V source. It is suitable for applications prioritizing small footprint due to the SOT-23-5 package and 2MHz switching frequency. Choose over adjustable versions if system stability is critical without external feedback networks. Consider the 600mA limit against peak load demands. This part is ideal for portable devices where battery life extension via low quiescent current is a primary design constraint.

Voltage Regulators - DC DC Switching Regulators Part Context

Part of the LM3671 series of 2MHz, 600mA step-down converters designed for portable applications. The MF variant specifically denotes the SOT-23-5 package configuration. This series is engineered to replace linear regulators in battery-powered systems, offering higher efficiency by stepping down voltage while maintaining regulation. It serves as a core power management IC for modern mobile and embedded hardware.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM3671MF-1.6/NOPB

Voltage Regulators - DC DC Switching Regulators FAQ

How does the LM3671MF-1.6 manage efficiency at light loads?

It automatically enters Pulse Frequency Modulation (PFM) mode at light loads, reducing the typical quiescent current to 16µA 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.