LM3673TL-1.8/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM3673TL-1.8/NOPB is a synchronous step-down DC-DC converter manufactured by Texas Instruments, designed for applications requiring efficient power conversion from a single-cell lithium-ion battery or other supply sources. This device integrates high-side and low-side N-channel MOSFETs to deliver a fixed output voltage of 1.8V with a maximum continuous output current of 350mA. It operates within an input voltage range of 2.7V to 5.5V and utilizes a fixed switching frequency of 2MHz to minimize external component size. The converter features adjustable soft-start timing and is housed in a compact 5-DSBGA package measuring 1.41mm by 1.08mm, suitable for space-constrained portable electronics.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates synchronous rectification with internal high-side and low-side N-channel MOSFETs for high efficiency
• Supports fixed switching frequency operation at 2MHz to reduce passive component footprint
• Features programmable soft-start capability to limit inrush current during startup
• Operates efficiently across a wide input voltage range suitable for single-cell lithium-ion batteries

Voltage Regulators - DC DC Switching Regulators Applications

• Portable consumer electronics powered by single-cell lithium-ion batteries
• Battery-powered handheld devices requiring stable 1.8V logic supplies
• Embedded systems utilizing single-cell power sources for core voltage regulation

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix against the manufacturer's official datasheet to confirm the fixed output voltage configuration. Ensure the package type matches the design requirements, as variations exist within the family. Cross-reference the ordering part number with the latest Texas Instruments documentation to validate RoHS compliance and availability status before finalizing procurement plans.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 1.8V output is required from a single-cell lithium-ion source. Consider the 2MHz switching frequency for smaller inductor selection compared to lower-frequency alternatives. Evaluate the 350mA current limit against peak load demands. The DSBGA package offers a small footprint but requires appropriate thermal management considerations on the PCB layout.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM3673 family of miniaturized step-down converters from Texas Instruments. The family includes variants with adjustable outputs and different fixed voltage options. The LM3673 series is characterized by its integration of power switches and control circuitry in a tiny package, targeting ultra-portable applications where board space is limited and efficiency from single-cell batteries is critical.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct substitutes include LM3673TLX-ADJ/NOPB for adjustable output configurations and LM3673MF-1.8/NOPB for SOT-23-5 packaging. Verify pinout compatibility and electrical specifications before substitution.