LM22677TJ-5.0/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM22677TJ-5.0/NOPB is a 5A SIMPLE SWITCHER step-down DC/DC switching regulator from Texas Instruments, operating with a fixed 5V output. It supports an input voltage range of 4.5V to 42V and features frequency synchronization or adjustable switching frequencies between 200kHz and 1000kHz. The device utilizes a TO-263-7 (PowerPAD) package for surface mount installation. It includes integrated overcurrent protection, enable functionality, and operates within a junction temperature range of -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated high-current power switch capable of delivering up to 5A output current
• Supports external clock synchronization or adjustable switching frequency for noise management
• Built-in thermal shutdown and cycle-by-cycle current limit protection
• Fixed 5.0V output option eliminates external resistor divider requirements

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation in industrial control systems
• Voltage conversion for embedded computing platforms
• Power supply stages in automotive electronics
• Battery-powered equipment requiring efficient step-down conversion

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the suffix NOPB indicates lead-free composition and RoHS compliance as per manufacturer standards. Confirm the TJ package designation corresponds to the TO-263-7 PowerPAD form factor. Ensure the -5.0 suffix matches the required fixed output voltage for the specific design application. Cross-reference the datasheet revision date to confirm feature consistency.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 5V output is required without external feedback resistors. Choose based on the need for frequency synchronization to avoid audible noise or EMI conflicts in sensitive environments. Consider the TO-263-7 package for its thermal performance relative to smaller packages. Verify that the 42V maximum input voltage aligns with the system's supply rail variations.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2267x family of SIMPLE SWITCHER regulators, designed for high-efficiency buck conversion. The LM22677 variant specifically targets 5A applications, distinguishing it from lower-current siblings like the LM22671 or LM22673. The integration of the power switch and controller simplifies the bill of materials compared to discrete solutions.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM22677TJ-5.0/NOPB serves as a direct replacement for National Semiconductor LM22677T-5.0. For non-synchronized variants, consider LM2677T-5.0/NOPB, noting differences in switching frequency and package availability.