LM2574DW-ADJ

Voltage Regulators - DC DC Switching Regulators Overview

The LM2574DW-ADJ is a monolithic integrated circuit step-down switching regulator from the LM2574 series, manufactured by onsemi. It provides an adjustable output voltage with a maximum output current of 0.5 A. The device operates within an input voltage range of 4 V to 40 V and features a fixed switching frequency of 58 kHz. Designed for through-hole or surface-mount applications depending on the package variant, it supports a wide operating temperature range from -40 °C to +125 °C. The component integrates internal frequency compensation and a fixed-frequency oscillator to simplify external circuit design.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated fixed-frequency oscillator at 58 kHz simplifies external component selection
• Internal frequency compensation reduces required external passive components
• Adjustable output voltage capability allows flexible power supply configurations
• Built-in thermal shutdown protects against overheating during fault conditions

Voltage Regulators - DC DC Switching Regulators Applications

• Step-down DC-DC converter circuits
• Pre-regulator stages for linear regulators
• Battery-powered systems requiring efficient voltage reduction
• General-purpose isolated and non-isolated power supplies

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific package type (SOIC vs DIP) as datasheets may list multiple variants under similar part numbers. Confirm RoHS compliance status if required for your assembly process. Check for obsolete status notifications, as some distributors list this part as no longer manufactured. Ensure the supplier provides traceability data including date codes and lot codes for quality assurance purposes.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when designing a buck converter requiring up to 500 mA output current. The adjustable output version is suitable for custom voltage requirements not covered by fixed-voltage variants. Consider the 58 kHz switching frequency for EMI constraints and inductor size trade-offs. Verify that the input voltage range of 4 V to 40 V aligns with your system's power source specifications.

Voltage Regulators - DC DC Switching Regulators Part Context

The LM2574 series includes fixed-output versions (e.g., 3.3V, 5V, 12V) and an adjustable variant. The DW suffix typically indicates a SOIC-8 surface-mount package, while N denotes PDIP-8 through-hole. This family is designed for ease of use with minimal external components compared to discrete solutions. The adjustable version offers flexibility for non-standard voltage rails.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct substitutes include other LM2574-ADJ variants from different manufacturers such as Texas Instruments or STMicroelectronics, provided pinouts and electrical characteristics match. Verify package compatibility (SOIC-8) and ensure equivalent thermal performance. Cross-reference datasheets for switching frequency and current limits to confirm functional equivalence.