LM3671LC-1.8

Voltage Regulators - DC DC Switching Regulators Overview

The LM3671LC-1.8 is a step-down DC-DC converter manufactured by National Semiconductor, now part of Texas Instruments. It operates with an input voltage range of 2.7V to 5.5V and provides a fixed output voltage of 1.8V. The device delivers up to 600mA of load current at a switching frequency of 2MHz (maximum 2.6MHz). It features synchronous rectification for high efficiency and includes protection mechanisms such as overcurrent protection. The typical quiescent current is 16μA in PFM mode, reducing to 0.01μA in shutdown.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Synchronous buck topology ensures high conversion efficiency across the operating range.
• Automatic transition between PWM and PFM modes optimizes performance for varying load conditions.
• Integrated current limit protects the device and external components during overload events.

Voltage Regulators - DC DC Switching Regulators Applications

• Portable systems powered by single-cell lithium-ion batteries
• Low-voltage digital circuit power supplies
• Battery-operated consumer electronics

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer origin, as National Semiconductor assets are managed by Texas Instruments. Confirm the specific suffix indicates the 1.8V fixed output variant. Ensure the package type matches the design requirements, typically SOT-23-5 or similar small footprints depending on the specific sub-version. Check RoHS compliance status if required by the target market regulations.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a compact solution is needed for converting battery voltage to lower logic levels. The 2MHz frequency allows for smaller passive components compared to lower-frequency alternatives. Ensure the load current does not exceed 600mA. Consider thermal dissipation capabilities if operating near maximum current limits in enclosed spaces.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM3671 family of ultra-small step-down converters designed for portable applications. It was originally developed by National Semiconductor before their acquisition by Texas Instruments. The LC suffix typically denotes a specific package and temperature grade configuration within the broader product line.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM3671LCX-1.8/NOPB: Direct equivalent from Texas Instruments with identical electrical specifications and pinout compatibility.

Voltage Regulators - DC DC Switching Regulators FAQ

What is the maximum switching frequency of the LM3671LC-1.8?

The maximum switching frequency is 2.6 MHz, with a typical value of 2 MHz.

Does the LM3671LC-1.8 support adjustable output voltage?

No, the LM3671LC-1.8 variant provides a fixed 1.8V output. Adjustable versions exist within the LM3671 family but require different part numbers.