LM2576S-3.3

Voltage Regulators - DC DC Switching Regulators Overview

The LM2576S-3.3 is a monolithic integrated circuit from the SIMPLE SWITCHER series, functioning as a 3A step-down (buck) voltage regulator. It operates with a fixed output voltage of 3.3V and supports an input voltage range up to 40V. The device utilizes a fixed-frequency internal oscillator operating at 52 kHz. It provides excellent line and load regulation with a guaranteed ±4% tolerance on output voltage under specified conditions. The component requires only four external components for operation and includes internal frequency compensation.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• High-efficiency replacement for three-terminal linear regulators, reducing heat sink size requirements
• Integrated cycle-by-cycle current limiting and thermal shutdown protection
• External shutdown capability with low standby current consumption
• Optimized for use with standard available inductors to simplify design

Voltage Regulators - DC DC Switching Regulators Applications

• Simple and efficient buck converters
• Pre-regulators for linear switching regulators
• On-card switching regulators
• Positive-to-negative converter implementations
• Battery charger power supplies

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify that the ordering suffix matches the required package type, as the 'S' designation indicates surface mount packaging. Confirm RoHS compliance status if environmental regulations apply to the specific manufacturing lot. Ensure the supplier source is authorized to guarantee authenticity, as this legacy part number has multiple historical manufacturers. Check for any specific tape-and-reel versus tube packaging preferences during procurement.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V output is required with up to 3A load capacity. It is suitable for designs where a 52 kHz switching frequency allows for larger, cost-effective inductors. Consider this part for applications needing robust overcurrent and thermal protection without complex control loops. It serves as a direct pin-for-pin replacement for older National Semiconductor versions.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM2576 series of SIMPLE SWITCHER regulators, which are designed to provide all active functions for step-down switching regulators. The series is known for simplifying switch-mode power supply design by minimizing external component count. The LM2576 family includes fixed voltage options and adjustable variants, catering to various industrial and commercial power management needs.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2576SX-3.3

Voltage Regulators - DC DC Switching Regulators FAQ

What is the typical standby current when the device is externally shut down?

The typical standby current is 50 µA when the shutdown pin is activated.

Does the LM2576S-3.3 require external frequency compensation?

No, the device includes internal frequency compensation, requiring only four external components for operation.