LM3678SDE-1.2/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM3678SDE-1.2/NOPB is a synchronous step-down DC/DC converter manufactured by Texas Instruments, formerly National Semiconductor. It integrates high-side and low-side N-channel MOSFETs to deliver up to 1.5A of output current. The device features an adjustable output voltage range from 0.8V to 5.5V, set via an external resistor divider. It operates with a fixed switching frequency of 1.2MHz, enabling the use of small surface-mount inductors and capacitors. The regulator includes comprehensive protection features such as cycle-by-cycle current limiting, thermal shutdown, and soft-start functionality.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates synchronous rectification for improved efficiency
• Supports programmable output voltage settings
• Includes built-in thermal and overcurrent protection mechanisms

Voltage Regulators - DC DC Switching Regulators Applications

• Portable battery-powered equipment
• Wireless communication devices
• Personal digital assistants (PDAs)
• Smartphones and mobile phones

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer designation on the datasheet, as the component is now produced by Texas Instruments following their acquisition of National Semiconductor. Confirm that the suffix indicates the specific package type and temperature rating required for your design. Ensure the ordering part number matches the exact pinout and electrical specifications needed for your circuit implementation.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a compact solution is required for converting higher battery voltages to lower logic levels. The 1.2MHz switching frequency allows for smaller passive components compared to lower-frequency regulators. Consider the maximum load current requirement and ensure the input voltage range aligns with your power source. Evaluate the thermal performance based on the expected ambient conditions and PCB copper area available for heat dissipation.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM3678 family of simple switcher regulators designed for space-constrained applications. It is part of a broader portfolio of power management ICs aimed at extending battery life in portable electronics. The integration of power switches reduces the component count and simplifies the layout process for designers working on dense printed circuit boards.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Check for direct equivalents within the LM3678 series with different output voltage options or package variations. Verify compatibility with existing control loops and compensation networks if substituting with similar regulators from other manufacturers.