LM3677TL-1.8

Voltage Regulators - DC DC Switching Regulators Overview

The LM3677TL-1.8 is a fixed-output step-down DC-DC converter manufactured by National Semiconductor, now part of Texas Instruments. It provides a regulated 1.8V output with a maximum load current of 600mA. The device operates from an input voltage range of 2.7V to 5.5V and utilizes a 5-pin DSBGA package. It supports pulse-width modulation (PWM) and pulse-frequency modulation (PFM) control techniques to optimize efficiency across varying load conditions.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Supports automatic switching between PWM and PFM modes for optimized light-load efficiency
• Integrates internal synchronous rectification for high conversion efficiency
• Includes built-in soft start functionality to limit inrush current during startup

Voltage Regulators - DC DC Switching Regulators Applications

• Portable electronic devices requiring efficient power management
• Ultra-low voltage circuit powering from single-cell batteries
• Battery-operated systems prioritizing extended operational life

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix against official datasheets to confirm output voltage and package type. Ensure compatibility with lead-free manufacturing standards if required. Confirm availability status as product lines may transition between manufacturers or become obsolete. Cross-reference pinouts and thermal requirements with the final design specifications before integration.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a compact solution is needed for stepping down voltages from single Li-Ion cells or similar rails. The fixed 1.8V output eliminates external resistor networks, simplifying the bill of materials. Consider the thermal performance of the DSBGA package relative to the expected ambient temperature and load current density in the target application environment.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM3677 family of miniature step-down converters designed for portable applications. It shares architectural similarities with other members like the LM3677LE series but differs in package configuration and specific output voltage options. The family emphasizes small footprint and high efficiency for mobile phone and handheld system designs.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify functional equivalence with other LM3677 variants or newer generations from Texas Instruments only through official cross-reference tools.