LM3671LCX-1.6/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM3671LCX-1.6/NOPB is a fixed-output step-down DC-DC converter from the Texas Instruments LM3671 family, designed for portable systems powered by single lithium-ion batteries. It operates within an input voltage range of 2.7V to 5.5V and provides a fixed output voltage of 1.6V with a maximum load current of 600mA. The device utilizes a synchronous buck topology with an integrated switch and features a typical switching frequency of 2MHz. It employs a DSBGA-5 package (1.41mm x 1.08mm) for compact board space. Quiescent current is typically 16µA in PFM mode, reducing to 0.01µA in shutdown. Operating temperature ranges from -40°C to +85°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a synchronous buck converter with a 2MHz fixed switching frequency to minimize external component size.
• Automatically transitions between PWM low-noise mode and PFM low-current mode to optimize efficiency across load conditions.
• Features a compact DSBGA-5 package requiring only three external surface-mount components for operation.

Voltage Regulators - DC DC Switching Regulators Applications

• Powering low-voltage circuits from single-cell lithium-ion battery sources
• Portable consumer electronics and mobile devices
• Battery-powered embedded systems requiring efficient step-down regulation

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'LCX' corresponds to the DSBGA-5 package variant when sourcing. Confirm that the fixed 1.6V output meets system requirements, as adjustable versions exist within the same family. Ensure compatibility with the -40°C to +85°C operating range for your application environment. Cross-reference the manufacturer part number against official Texas Instruments documentation to avoid confusion with automotive-grade or alternative package variants.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 1.6V output is required for space-constrained designs. The DSBGA-5 package offers a smaller footprint compared to SOT-23-5 alternatives. Consider the 600mA current limit for load requirements. The 2MHz frequency allows for smaller inductors but may require careful PCB layout for noise management. Verify thermal performance under maximum load conditions given the small package size.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM3671 series of high-efficiency step-down converters. The LCX suffix denotes the specific DSBGA-5 package configuration, distinguishing it from SOT-23-5 (MF/MFX) or other package types like TL. The NOPB suffix indicates lead-free and RoHS compliance. The family is optimized for single-cell lithium-ion applications, offering a balance of efficiency, size, and cost for portable electronics.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM3671LCX-1.8/NOPB: Same package and family, different fixed output voltage (1.8V). LM3671MF-1.6/NOPB: Same electrical specifications and output voltage, but housed in a larger SOT-23-5 package. LM3671TL-1.6/NOPB: Same electrical specifications, but housed in a DSBGA-5 package; verify pinout compatibility if substituting.