LM2676SD-3.3/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2676SD-3.3/NOPB is a step-down switching regulator from Texas Instruments, operating at a fixed 500 kHz frequency. It delivers an output voltage of 3.3V with a maximum load current of 1A. The device integrates a 0.44Ω N-channel MOSFET switch and requires external components including an inductor, input/output capacitors, and a feedback resistor network for voltage adjustment. It supports input voltages up to 40V and offers thermal shutdown protection. The package is a small DPAK (TO-263) with five leads, designed for efficient power conversion in space-constrained applications.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated high-efficiency N-channel power switch
• Fixed 500 kHz switching frequency for compact passive size
• Thermal shutdown protection for enhanced reliability

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation modules
• Battery-powered systems requiring efficient step-down conversion
• General-purpose DC/DC converter circuits

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the exact part marking matches 'LM2676SD-3.3/NOPB' on the component body. Confirm the suffix '/NOPB' indicates lead-free and RoHS compliance as per manufacturer specifications. Ensure the ordering code aligns with the specific temperature range and packaging format required for your assembly process. Cross-reference the datasheet revision date to ensure compatibility with current design standards.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V output at 1A is required with minimal external control complexity. The integrated switch simplifies design compared to discrete solutions. Consider the 500 kHz frequency trade-off between component size and efficiency. Verify that the input voltage range stays within 40V limits and that thermal dissipation requirements are met by the PCB layout or heatsinking strategy.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2676 family of adjustable and fixed-output step-down regulators. It shares architectural similarities with other members like the LM2675 and LM2678 but differs in switching frequency and current capability. The 'SD' designation indicates the TO-263 package, while '/NOPB' specifies non-halogenated and lead-free construction compliant with environmental directives.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct substitutes include the LM2676SX-3.3/NOPB (SOT-223 package) if pinout compatibility allows. For higher current needs, consider the LM2676HV series. Verify pinout alignment and thermal performance characteristics before substitution. Check for updated revisions or alternative packages from Texas Instruments that maintain functional equivalence.