LM2576T-12/LB03

Voltage Regulators - DC DC Switching Regulators Overview

The LM2576T-12/LB03 is a monolithic integrated circuit from the Texas Instruments SIMPLE SWITCHER series, functioning as a 3-A step-down voltage regulator. It utilizes a buck topology to convert higher input voltages into a fixed 12-V output. The device operates with a wide input voltage range of 4 V to 40 V and features a fixed-frequency internal oscillator at 52 kHz. Packaged in a TO-220-5 through-hole configuration, it supports an operating temperature range from -40 °C to +125 °C. The component includes built-in thermal shutdown and current limiting for fault protection.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated 52-kHz fixed-frequency oscillator simplifies external component requirements
• Built-in thermal shutdown and current limiting provide robust fault protection
• TTL-shutdown capability enables low-power standby mode operation

Voltage Regulators - DC DC Switching Regulators Applications

• Motor drives
• Appliances
• Test and measurement equipment

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the LB03 suffix against official Texas Instruments documentation to confirm specific marking or tape-and-reel variations, as standard datasheets typically list the TO-220 package without this suffix. Ensure the component matches the specified 12-V fixed output and 3-A current rating. Cross-reference the manufacturer part number with authorized distributors to confirm authenticity and traceability before procurement.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component for designs requiring a simple, high-efficiency buck converter with a fixed 12-V output. It serves as a direct replacement for older linear regulators where efficiency and heat dissipation are concerns. Consider the 52-kHz switching frequency when selecting external inductors, as lower frequencies require larger passive components compared to modern high-frequency alternatives.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2576 family of SIMPLE SWITCHER power converters, designed for straightforward DC-DC conversion. The 'T' indicates a TO-220 through-hole package, while the '-12' specifies the fixed 12-V output version. The LM2576 series is widely recognized for its ease of use, requiring minimal external components to establish a stable regulated supply.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2576T-12/NOPB