LM2677T-3.3/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2677T-3.3/NOPB is a SIMPLE SWITCHER high-efficiency 5A step-down voltage regulator from Texas Instruments. It operates with an input voltage range of 8V to 40V and provides a fixed 3.3V output. The device integrates a 0.44Ω N-channel MOSFET and supports a switching frequency of 260kHz. It features thermal shutdown, current limit protection, and a shutdown pin. The component is housed in a TO-220-7 package and functions within a temperature range of -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated synchronous rectification for high efficiency
• Built-in thermal shutdown and current limiting protection
• Fixed 3.3V output configuration
• Supports external frequency synchronization

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for industrial equipment
• Power supplies for embedded systems
• Battery-powered applications requiring efficient step-down conversion

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the suffix 'T' indicates tube packaging and 'NOPB' confirms lead-free/RoHS compliance. Confirm the manufacturer is Texas Instruments or authorized licensee. Ensure the part number matches the specific 3.3V fixed output variant. Check datasheet revision dates for updated electrical characteristics.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V output at up to 5A is required. The TO-220 package suits applications needing robust thermal dissipation without active cooling. Consider the 260kHz frequency for balancing component size and efficiency. Verify input voltage stays within the 8V to 40V operational window.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2677 family of SIMPLE SWITCHER regulators. It shares topology with the LM2678 but includes integrated synchronous rectification for improved performance. The LM2677 series offers higher efficiency compared to earlier non-synchronous buck converters in the same product line.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2677S-3.3/NOPB (Same function, SMD package)

Voltage Regulators - DC DC Switching Regulators FAQ

What is the maximum output current?

The device supports a continuous output current of up to 5A.

Does it include synchronous rectification?

Yes, the LM2677 integrates a synchronous rectifier for enhanced efficiency.