LM2576T-ADJ/LB03

Voltage Regulators - DC DC Switching Regulators Overview

The LM2576T-ADJ/LB03 is a monolithic integrated circuit from the Texas Instruments SIMPLE SWITCHER series, designed as a step-down switching regulator. It operates with an input voltage range of 4V to 40V and provides a continuously adjustable output voltage between 1.23V and 37V. The device supports a maximum load current of 3A with excellent line and load regulation. It utilizes a fixed internal switching frequency of approximately 52kHz. The component is housed in a TO-220-5 package and is rated for operation over an extended temperature range from -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a 3A switch with built-in frequency compensation for simplified design
• Features TTL shutdown capability for low-power standby applications
• Includes comprehensive protection mechanisms such as thermal shutdown and cycle-by-cycle current limiting

Voltage Regulators - DC DC Switching Regulators Applications

• Distributed power supply systems
• Pre-regulators for linear post-regulator modules
• Efficient buck converters replacing linear regulators

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific LB03 suffix against the manufacturer's official datasheet to confirm pinout compatibility and marking codes. Ensure the supplier provides traceability documentation consistent with Texas Instruments quality standards. Cross-reference the part number with authorized distribution channels to avoid counterfeit components. Confirm RoHS compliance status if required by your manufacturing specifications.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when designing a high-efficiency DC-DC converter requiring up to 3A output current. It is suitable for applications where input voltages significantly exceed the required output level. Consider the external Schottky diode and inductor requirements specified in the reference design. Evaluate thermal management needs based on the expected power dissipation within the TO-220 package.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2576 family of SIMPLE SWITCHER regulators, which are widely used for their ease of design and robust performance. The ADJ variant allows for flexible output voltage configuration via external resistors. The LB03 suffix typically denotes a specific tape-and-reel packaging option or regional variant within the standard TO-220 form factor.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

• LM2576T-ADJ/NOPB

Voltage Regulators - DC DC Switching Regulators FAQ

What is the typical switching frequency of the LM2576T-ADJ/LB03?

The device operates at a fixed internal switching frequency of approximately 52kHz.

How is the output voltage adjusted in this regulator?

The output voltage is set using an external resistor divider network connected to the feedback pin, allowing adjustment from 1.23V to 37V.