LM3671LC-1.2

Voltage Regulators - DC DC Switching Regulators Overview

The LM3671LC-1.2 is a step-down DC-DC converter manufactured by National Semiconductor, now part of Texas Instruments. It operates with a typical switching frequency of 2 MHz and supports a maximum load current of 600 mA. The device provides a fixed output voltage of 1.2 V and accepts an input voltage range from 2.7 V to 5.5 V. It utilizes a buck topology and features automatic switching between PWM and PFM modes for optimized efficiency across varying load conditions.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Intelligent mode switching between low-noise PWM and low-current PFM operations
• Internal synchronous rectification for high energy efficiency
• Fixed 1.2 V output configuration in compact packaging

Voltage Regulators - DC DC Switching Regulators Applications

• Portable mobile devices
• Single-cell battery powered systems
• Low voltage circuit power supplies

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer origin as National Semiconductor or Texas Instruments due to acquisition history. Confirm the package type matches design requirements, typically SOT-23-5 or similar small footprints. Ensure the suffix indicates lead-free compliance if required by assembly specifications. Cross-reference datasheet revisions to confirm pinout consistency.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 1.2 V output is required from a single lithium-ion cell. It is suitable for space-constrained designs due to minimal external component count. Consider the 2 MHz frequency for smaller inductor size compared to lower frequency alternatives. Verify thermal performance under maximum load conditions within the specified temperature range.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM3671 family of 2 MHz, 600 mA step-down converters. The LC variant specifically denotes a fixed 1.2 V output version. The family is designed for portable applications requiring high efficiency and small solution size. Other variants in the series offer different fixed voltages or adjustable output ranges.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM3671LC-1.2/NOPB serves as a direct lead-free replacement. LM3671MF-1.2 offers a different package option with identical electrical characteristics. LM3674 variants provide similar functionality but may differ in specific control features or package dimensions.