LM2677SD-5.0

Voltage Regulators - DC DC Switching Regulators Overview

The LM2677SD-5.0/NOPB is a SIMPLE SWITCHER high-efficiency 5A step-down voltage regulator with synchronous rectification, manufactured by Texas Instruments. It operates from an input voltage range of 8V to 40V and provides a fixed 5V output at up to 5A. The device integrates a 150mΩ N-channel power switch and a 130mΩ synchronous rectifier for optimized performance. It features a fixed switching frequency of 260kHz, allowing the use of small inductors and capacitors. The controller includes internal compensation, current limit protection, thermal shutdown, and a reference enable pin. It is available in a 14-pin VSON package rated for operation between -40°C and +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated synchronous rectification eliminates the need for an external Schottky diode, improving efficiency and reducing component count.
• Fixed 260kHz switching frequency enables the use of compact passive components while maintaining stable regulation.
• Built-in current limit and thermal shutdown protect the device under overload or excessive temperature conditions.
• Reference enable pin allows for precise tracking or sequencing when multiple supplies are used in a system.

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for embedded systems requiring 5V rails
• Industrial control systems operating within wide input voltage ranges
• Telecommunications equipment power distribution networks

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the suffix NOPB indicates lead-free and RoHS compliance. Confirm the SD package corresponds to the 14-VSON (5x6) footprint. Ensure the -5.0 designation matches the required 5V fixed output. Cross-reference the manufacturer part number with official TI documentation to avoid counterfeit components.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a 5A buck converter with integrated synchronous rectification is required. The 260kHz frequency suits applications needing moderate ripple and small magnetics. Consider the 40V maximum input rating for automotive or industrial inputs. Verify thermal requirements for the VSON package under full load conditions.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2677 series of SIMPLE SWITCHER regulators. It differs from the LM2678 by including an internal synchronous rectifier, whereas the LM2678 requires an external diode. It shares the 5A capability and 260kHz frequency with other members of the family but offers higher efficiency due to the integrated sync FET.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2677SDX-5.0/NOPB is the reel version of the same device. LM2677S-5.0/NOPB is the TO-263 variant. Direct replacements must maintain 5A output, 5V fixed output, and synchronous rectification.