LM2577S + LM2596S Automatic Buck-Boost Power Module

The LM2577S LM2596S Automatic Buck-Boost Power Module is a versatile DC-DC converter designed to automatically step up (boost) or step down (buck) input voltage to a stable output. Using the LM2577S boost converter and LM2596S buck converter together, the module seamlessly adjusts output voltage regardless of whether the input is higher or lower than the desired output. It is ideal for battery-powered systems, DIY electronics, portable devices, vehicle applications, and regulated DC supplies.

Features:

1. Automatic buck-boost functionality (step-up/step-down)
2. Stable output regardless of fluctuating input voltage
3. Built-in LM2577S boost converter and LM2596S buck converter
4. Adjustable output voltage using onboard potentiometer
5. High conversion efficiency with low ripple
6. Wide input voltage range suitable for various power sources
7. Ideal for battery packs, DIY electronics, and regulated DC powering

Specifications:

• Module Type: Automatic Buck-Boost Power Supply
• Input Voltage: 3.5V – 35V
• Output Voltage: Adjustable 1.25V – 30V
• Output Current: Up to 2A (recommended), 3A peak
• ICs Used: LM2577S (Boost), LM2596S (Buck)
• Efficiency: Up to 92%
• Switching Frequency:

  • LM2577S: ~52 kHz

  • LM2596S: ~150 kHz

• Protection Features:

  • Overcurrent protection

  • Thermal shutdown

  • Short-circuit protection

• Adjustment: Potentiometer for output voltage tuning
• Operating Temperature: –20°C to +85°C
• Output Ripple: Low 
• Applications: Battery systems, DIY power supply, automotive circuits, embedded electronics

Package Includes:

1 × LM2577S + LM2596S Automatic Buck-Boost Power Module