LM2576S-3.3/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2576S-3.3/NOPB is a monolithic integrated circuit step-down switching regulator from the Texas Instruments SIMPLE SWITCHER series, designed for high-efficiency DC-DC conversion. It operates with an input voltage range of 4V to 40V and provides a fixed 3.3V output at up to 3A load current. The device utilizes a 52kHz internal oscillator and employs current-mode control for rapid transient response. Packaged in a surface-mount TO-263 (D2PAK) housing with five pins, it integrates essential protection features including thermal shutdown and cycle-by-cycle current limiting.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a power switch rated for 3A continuous output current within a single monolithic package
• Utilizes current-mode control architecture to ensure fast line and load transient response
• Includes built-in thermal shutdown and cycle-by-cycle current limiting for comprehensive fault protection
• Requires minimal external components, typically needing only four support parts for operation

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation modules for distributed power architectures
• Efficient pre-regulators for downstream linear regulators
• Standard 5V bus conversion systems requiring stepped-down voltages
• Battery-powered equipment utilizing buck topology for extended runtime

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'NOPB' confirms lead-free and RoHS compliance status as per manufacturer specifications. Confirm the 'S' designation indicates the TO-263 surface mount package variant rather than through-hole options. Ensure the '-3.3' identifier matches the required fixed output voltage for the target application design. Cross-reference the datasheet revision date to confirm pinout and electrical parameter consistency before finalizing procurement orders.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V output is required from an input source between 4V and 40V. The TO-263 package offers superior thermal dissipation compared to smaller footprints, suitable for sustained 3A loads. Consider the 52kHz switching frequency for balancing component size against electromagnetic interference requirements. This part serves as a direct replacement for legacy National Semiconductor LM2576 variants while maintaining pin compatibility.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM2576 family of SIMPLE SWITCHER regulators, which are widely recognized for simplifying switch-mode power supply designs. The series includes adjustable, fixed voltage, and high-voltage variants. The LM2576S-3.3/NOPB specifically addresses applications needing a reliable, low-component-count solution for stepping down higher voltages to standard logic levels efficiently.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2576S-3.3/NOPB is functionally equivalent to LM2576S-3.3 without the NOPB suffix, differing primarily in environmental compliance attributes.