LM3679TL-1.8/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM3679TL-1.8/NOPB is a fixed-output buck switching regulator IC manufactured by National Semiconductor, now part of Texas Instruments. It provides a stable 1.8V output with a maximum current capacity of 350mA. The device operates from an input voltage range of 2.5V to 5.5V and utilizes a synchronous rectifier topology for improved efficiency. It features a fixed switching frequency of 3MHz, allowing for the use of small external components. The component is housed in a compact 5-DSBGA package (1.41x1.08mm) and is rated for an operating temperature range of -30°C to 85°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Synchronous rectification for enhanced power conversion efficiency
• Fixed 3MHz switching frequency enabling compact passive component selection
• Integrated internal switch eliminates need for external power transistor
• Compact 5-pin DSBGA footprint suitable for space-constrained designs

Voltage Regulators - DC DC Switching Regulators Applications

• Portable battery-powered electronic devices requiring efficient step-down regulation
• Embedded systems utilizing low-voltage logic or analog circuits
• Consumer electronics with strict size limitations for power management modules

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer marking on the component surface to confirm it originates from National Semiconductor or Texas Instruments. Ensure the suffix /NOPB indicates lead-free compliance as per RoHS standards. Cross-reference the date code and lot number against official distributor certificates of authenticity to prevent counterfeit infiltration. Confirm the physical package dimensions match the specified 5-DSBGA form factor before integration into production lines.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 1.8V output is required with moderate current demands up to 350mA. It is appropriate for applications where board space is limited due to its small DSBGA package. Consider the 3MHz switching frequency if minimizing inductor size is a priority. Ensure the input supply voltage remains within the 2.5V to 5.5V range for proper operation. Evaluate thermal performance requirements given the -30°C to 85°C operating temperature specification.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM3679 series of DC-DC converters designed for portable applications. It represents a transition from older linear regulators to more efficient switching solutions in low-power scenarios. The /NOPB suffix denotes environmental compliance, specifically lead-free manufacturing processes aligned with international standards. It serves as a direct replacement for obsolete linear regulators in 1.8V rail generation tasks.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Check for LM3679 variants with different output voltages if system requirements change. Verify pin compatibility with alternative manufacturers' synchronous buck converters offering similar current ratings. Ensure switching frequency differences do not impact existing filter component values.