LM2576S-5.0

Voltage Regulators - DC DC Switching Regulators Overview

The LM2576S-5.0 is a monolithic integrated circuit from the SIMPLE SWITCHER series, functioning as a step-down (buck) switching regulator. Manufactured by UMW in a TO-263-5L surface-mount package, it delivers a fixed 5.0V output with a maximum current of 3A. The device operates with an input voltage range of 4V to 40V and utilizes a fixed internal oscillator frequency of 52kHz. It features positive output configuration and includes built-in thermal shutdown and current limiting protections.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a fixed-frequency oscillator and error amplifier to minimize external component count
• Provides high efficiency compared to traditional three-terminal linear regulators
• Includes comprehensive protection circuits such as thermal shutdown and cycle-by-cycle current limiting

Voltage Regulators - DC DC Switching Regulators Applications

• Efficient step-down DC-DC power supplies
• Pre-regulators for linear voltage regulators
• On-card regulation systems
• Positive-to-negative converter topologies

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify that the specific part number corresponds to the UMW manufacturer designation rather than Texas Instruments or National Semiconductor origins. Confirm the package variant matches the required TO-263-5L footprint and pinout. Ensure compliance with RoHS3 standards if environmental regulations apply to the final assembly. Cross-reference datasheet revisions to confirm parameter consistency across production batches.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a robust, low-component-count buck regulator is required for inputs up to 40V. The 52kHz switching frequency necessitates larger passive components compared to modern high-frequency alternatives. Consider the thermal performance of the TO-263 package under full 3A load conditions. This device serves as a direct functional replacement for legacy LM2576 designs requiring fixed 5V output.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM2576 family of SIMPLE SWITCHER regulators, originally developed by National Semiconductor and now produced by various manufacturers including UMW. The 'S' suffix indicates the TO-263 surface-mount package variant. The '-5.0' suffix specifies the fixed 5.0-volt output version, distinguishing it from adjustable or other fixed voltage variants within the same series.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2576S-5.0/NOPB

Voltage Regulators - DC DC Switching Regulators FAQ

What is the typical standby current when the device is externally turned off?

The typical standby current is 50µA when the ON/OFF pin is driven low.

Does the LM2576S-5.0 support synchronous rectification?

No, the LM2576S-5.0 uses a non-synchronous design with an internal switch and external diode.