LM2575S 5V SMD Buck Voltage Regulator 1A

The LM2575S is a high-efficiency, 5V fixed-output, step-down (buck) switching voltage regulator in an SMD (TO‑263/D2PAK) package. Designed for simplicity and reliability, this single-chip regulator integrates all active functions required to deliver up to 1A of continuous load current with excellent line and load regulation. Ideal for powering Arduino boards, microcontroller circuits, sensor modules, and embedded systems, it supports a wide 4.75V–40V input range, making it a versatile choice for electronics components and hobbyist or professional designs.

🌟 Key Features

• Fixed 5V output variant (this listing); family also available in 3.3V, 12V, 15V, and adjustable versions
• Adjustable version range: 1.23V to 37V (±4% max over line and load conditions)
• 1A continuous output current capability
• 52 kHz fixed-frequency internal oscillator for predictable EMI performance
• Wide input voltage: 4.75V to 40V
• High efficiency step-down conversion with minimal external parts
• Requires only 4 external components (inductor, diode, input/output capacitors)
• TTL-compatible shutdown pin for low-power standby control
• Works with standard, commonly available inductors
• Thermal shutdown and current limit protections for robust operation
• Package options in the series: TO‑220 and TO‑263 (this product is SMD TO‑263)

📐 Technical Specifications

• Input Voltage Range: 4.75V to 40V
• Output Voltage: 5V (fixed)
• Output Current: 1A
• Switching Frequency: 52 kHz
• Operating Temperature: −40°C to +125°C
• Package Type: SMD (TO‑263/D2PAK)

🔌 Designed for Engineers & Makers

• Power Arduino and other microcontroller boards, logic ICs, and sensor modules
• Build compact, efficient buck converter supplies from battery or adapter inputs
• Integrate into Raspberry Pi-based peripherals and embedded subsystems (ensure total load ≤ 1A)
• Ideal for custom electronics projects, development boards, and production designs

🧰 Typical Applications

• Simple high-efficiency step-down (buck) regulator
• On-card switching regulators for embedded and industrial systems
• Positive-to-negative converters (inverting buck-boost)
• Negative step-up converters for regulated negative rails
• Power supplies for battery chargers and portable equipment

✅ Notes for Best Results

• Use a suitable Schottky diode, low-ESR capacitors, and an inductor rated for the required ripple current
• Observe proper PCB layout for switching regulators to minimize noise and improve efficiency