LM2575S-ADJ Adjustable 1A step-down (buck) switching voltage regulator TO-263-5

Product Title

LM2575S-ADJ Adjustable 1A Step-Down (Buck) Switching Voltage Regulator – TO-263-5

Overview

The LM2575S-ADJ is a monolithic step-down (buck) switching voltage regulator capable of delivering up to 1A output current with excellent line and load regulation. Operating at a fixed switching frequency of 52kHz, it requires only a few external components to build an efficient DC-DC power supply.

Its adjustable output design allows users to generate a wide range of regulated voltages, making it suitable for industrial, embedded, automotive, and general-purpose power conversion applications.

Key Features

• Adjustable output voltage design
• Output current up to 1A
• Fixed 52kHz switching frequency
• High efficiency compared to linear regulators
• Wide input voltage range
• Excellent line and load regulation
• Thermal shutdown protection
• Current limit protection
• Requires minimal external components
• TO-263-5 (D²PAK) surface-mount package

Technical Specifications

Device Information

• Part Number: LM2575S-ADJ
• Function: Step-Down (Buck) Switching Regulator
• Output Type: Adjustable
• Package: TO-263-5 (D²PAK)

Electrical Characteristics

• Input Voltage Range: 4V to 40V
• Output Voltage Range: 1.23V to 37V (adjustable)
• Maximum Output Current: 1A
• Reference Voltage: 1.23V
• Switching Frequency: 52kHz (typical)
• Efficiency: Up to 88% (application dependent)

Regulation Performance

• Line Regulation: Excellent
• Load Regulation: Excellent
• Low standby power consumption

Protection Features

• Thermal shutdown
• Current limit protection
• Safe operating area protection

Operating Temperature

• Operating Junction Temperature: Up to +125°C

Power & Programming

• No programming required
• Requires external components:
  • Inductor
  • Schottky diode
  • Input capacitor
  • Output capacitor
  • Feedback resistor divider
• Suitable for creating:
  • 24V → 12V
  • 24V → 5V
  • 12V → 3.3V
  • Battery-powered DC power supplies

Typical Output Voltage Formula

VOUT = 1.23 × (1 + R2/R1)

Where:

• R1 is connected from FB to GND
• R2 is connected from VOUT to FB

Applications

• Embedded systems
• Industrial controllers
• Automotive electronics
• Battery-powered equipment
• Microcontroller power supplies
• Communication equipment
• DC-DC converter modules
• DIY power supply projects
• IoT devices

What’s Included

• 1x LM2575S-ADJ Adjustable Buck Regulator IC (TO-263-5)

Notes

• This is a surface-mount TO-263 package and requires SMD soldering.
• Proper PCB layout is important for stable operation and reduced EMI.
• Use a suitable Schottky diode and inductor according to the desired output voltage and load current.
• Heatsinking through adequate PCB copper area is recommended for higher power applications.
• The adjustable version requires an external resistor divider to set the output voltage.