LM2594M-3.3

Voltage Regulators - DC DC Switching Regulators Overview

The LM2594M-3.3 is a 150 kHz fixed-frequency PWM buck DC/DC converter manufactured by UMW. It provides a fixed 3.3 V output voltage with a maximum load current capability of 1.5 A. The device operates within a wide input voltage range of 4.5 V to 40 V. Key electrical parameters include a minimum dropout voltage of 1.5 V and an internal switching frequency of 150 kHz. The controller allows linear duty ratio adjustment from 0% to 100%. It features built-in thermal shutdown, current limit functions, and TTL shutdown capability.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Fixed 150 kHz switching frequency with internal frequency compensation
• Integrated power transistor for high efficiency and low ripple
• Built-in thermal shutdown and dual current limit protection
• TTL shutdown pin with hysteresis function for ON/OFF control

Voltage Regulators - DC DC Switching Regulators Applications

• LCD Monitor and LCD TV power supplies
• Digital Photo Frame power regulation
• Set-up Box voltage conversion
• ADSL Modem power management
• Telecom and Networking Equipment

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer designation matches UMW specifications rather than Texas Instruments or National Semiconductor variants. Confirm the suffix indicates the 3.3 V fixed output version. Ensure the package type aligns with SOP-8 requirements. Check RoHS compliance status against specific order codes. Validate that the component meets the required 1.5 A load current specification for the target application.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3 V output is required from an input range up to 40 V. The 1.5 A current capability supports moderate load applications. The 150 kHz frequency allows for smaller passive components compared to lower frequency regulators. Consider the 1.5 V dropout voltage for headroom calculations. The integrated compensation simplifies design complexity. Verify thermal performance under maximum load conditions.

Voltage Regulators - DC DC Switching Regulators Part Context

The LM2594 series belongs to the SIMPLE SWITCHER family of step-down regulators. This specific model is the 3.3 V fixed-output variant within the standard voltage range. It competes with other monolithic buck converters offering similar current ratings. The series is known for requiring minimal external components due to internal optimization. It serves as a direct replacement for older discrete regulator designs in consumer electronics.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2594MX-3.3/NOPB (Texas Instruments equivalent)

Voltage Regulators - DC DC Switching Regulators FAQ

What is the maximum output current for the LM2594M-3.3?

The device is capable of driving a constant 1.5 A load.

Does the LM2594M-3.3 support adjustable output voltage?

No, the LM2594M-3.3 is a fixed-output regulator providing 3.3 V. Adjustable versions exist within the same series.

What happens during an overcurrent condition?

The device includes a built-in current limit function. A second current limit function may reduce the operating frequency from 150 kHz to 50 kHz.