LM3677LEX-1.8/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM3677LEX-1.8/NOPB is a synchronous step-down DC-DC converter manufactured by Texas Instruments. It features a fixed 1.8 V output voltage and supports up to 600 mA of continuous output current. The device operates with a switching frequency of 3 MHz, enabling the use of small external components. It accepts an input voltage range from 2.7 V to 5.5 V. The component is housed in a compact 6-USON (2x1.5 mm) package and is rated for operation within a temperature range of -30°C to +85°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Synchronous rectification architecture ensures high conversion efficiency across load conditions.
• Fixed 3 MHz switching frequency minimizes required passive component size.
• Integrated soft-start functionality limits inrush current during power-up sequences.

Voltage Regulators - DC DC Switching Regulators Applications

• Portable consumer electronics requiring efficient power management
• Battery-operated devices needing stable low-voltage regulation
• Ultra-low voltage circuit supplies in mobile platforms

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify that the ordering suffix matches the specific output voltage variant required for the design. Confirm the package type corresponds to the footprint specifications in the layout guidelines. Ensure the RoHS compliance status aligns with environmental regulations applicable to the target market. Cross-reference the datasheet revision to confirm compatibility with existing design parameters.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 1.8 V output is sufficient, eliminating the need for external feedback resistors. The 3 MHz frequency allows for smaller inductors compared to lower-frequency alternatives. Consider the 600 mA current limit against peak load requirements. The wide input range accommodates single-cell lithium-ion battery discharge profiles effectively.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM3677 family of miniature step-down converters designed for ultra-low voltage applications. It shares architectural similarities with other members like the LM3674 but offers higher switching frequencies and different packaging options. The series targets space-constrained designs where efficiency and component count are critical constraints.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct substitutes include the LM3677LE-1.82/NOPB for slightly different fixed outputs and the LM3677MFX-1.8/NOPB which utilizes a SOT-23-5 package instead of the USON-6 form factor. Verify pinout compatibility before swapping packages to avoid PCB redesign requirements.