LM2677T-5.0/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2677T-5.0/NOPB is a Texas Instruments SIMPLE SWITCHER step-down switching voltage regulator designed for through-hole mounting in a TO-220-5 package. It delivers a fixed 5 V output with a maximum current capability of 5 A. The device operates from an input voltage range of 8 V to 40 V at a constant switching frequency of 260 kHz. It features integrated thermal shutdown and adjustable current limiting, ensuring robust performance across an operating temperature range of -40 °C to +125 °C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated thermal shutdown protection prevents damage during overheating conditions
• Adjustable current limit circuitry safeguards the switch against short circuits and overloads
• Fixed 5 V output configuration simplifies design by eliminating external feedback resistors

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for microprocessors and digital logic circuits
• Power supply conditioning for industrial control systems
• Battery charging pre-regulation stages

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify that the specific suffix /NOPB confirms lead-free compliance and RoHS adherence as per Texas Instruments standards. Confirm the physical package is the standard TO-220-5 variant suitable for through-hole assembly. Ensure the ordering part number matches the fixed 5.0 V output specification exactly, as other suffixes may indicate different voltages or packages.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a high-current, through-hole buck converter is required for board-level power distribution. The 260 kHz frequency allows for smaller passive components compared to lower-frequency alternatives. Consider the thermal dissipation requirements of the TO-220 package, as it handles significant power loss at full load without requiring active cooling in most applications.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2677 family of SIMPLE SWITCHER regulators, which are known for their ease of use and high efficiency. The LM2677 series includes various output voltage options and package types, such as surface-mount TO-263 variants. The T-5.0/NOPB designation specifically identifies the through-hole TO-220 version with a fixed 5 V output and non-plated lead finish.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2677T-5.0 (older generation without NOPB suffix)

Voltage Regulators - DC DC Switching Regulators FAQ

Does the LM2677T-5.0/NOPB support synchronous rectification?

No, the LM2677T-5.0/NOPB uses a standard non-synchronous buck topology with an internal power switch.

What is the minimum input voltage required for operation?

The minimum input voltage is 8 V, which is necessary to maintain regulation and proper operation of the internal control circuitry.