LM2576T-15

Voltage Regulators - DC DC Switching Regulators Overview

The LM2576T-15 is a monolithic integrated circuit belonging to the SIMPLE SWITCHER series, designed as a 3A step-down (buck) switching voltage regulator. It provides a fixed 15V output with excellent line and load regulation. The device operates with an input voltage range of 4V to 40V and utilizes a fixed-frequency internal oscillator at 52kHz. Key electrical parameters include a maximum output current of 3A, a typical standby current of 50µA in shutdown mode, and an operating junction temperature range from -40°C to 125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a fixed-frequency oscillator for simplified design without external timing components
• Includes internal frequency compensation and cycle-by-cycle current limiting
• Features thermal shutdown protection for fault condition safety
• Supports external shutdown control with low standby current consumption

Voltage Regulators - DC DC Switching Regulators Applications

• Step-down DC-DC converter circuits requiring 15V output
• Pre-regulator stages for downstream linear regulators
• Efficient replacement for traditional three-terminal linear regulators
• General-purpose power supply designs within the 4V-40V input range

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer origin carefully, as the LM2576 series is produced by multiple vendors including Texas Instruments, ON Semiconductor, and others. Confirm that the specific part number suffix matches the required package type and output tolerance. Ensure compliance with RoHS directives if applicable to your assembly process. Cross-reference datasheets from different suppliers to confirm pinout compatibility and exact electrical specifications before finalizing procurement.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 15V output is required from a variable input between 4V and 40V. It is suitable for applications needing up to 3A continuous load current. Consider the TO-220 or D2PAK package based on thermal management requirements. Compare against adjustable versions if precise voltage tuning is needed, or against lower-current variants like the LM2575 if the load demand is below 1A.

Voltage Regulators - DC DC Switching Regulators Part Context

This component is part of the broader LM2576 family of buck converters, which also includes adjustable versions and other fixed voltage outputs such as 3.3V, 5V, and 12V. The series is known for reducing heat sink size compared to linear regulators. Related parts include the LM2576HV for higher input voltages and the LM2575 for lower current applications.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct substitutes include LM2576T-15 from other manufacturers such as ON Semiconductor or National Semiconductor. Verify equivalent performance metrics such as switching frequency and output current capability. Ensure the replacement maintains the same pin configuration and thermal characteristics.