User’s Guide: DC-DC USB Step-up Power Supply Module (0.9V–5V to 5V)

Overview

This module is a compact boost converter that steps up input voltages between 0.9V and 5V to a regulated 5V output, suitable for powering USB devices, microcontrollers, or sensors.

How It Works

This module uses an inductor-based boost converter circuit:

• It stores energy in an inductor at low voltage.
• Rapid switching and control circuitry increase the voltage.
• Output is regulated to 5V via feedback control.

Wiring Instructions

Input Side

• IN+: Connect to positive terminal of your power source (e.g., battery).
• IN−: Connect to ground/negative terminal.

Examples:

• 1x AA battery → 1.5V input
• 2x AA batteries → 3V input
• Small solar panel → 3–5V input

Output Side

• USB-A port: Provides regulated 5V output.
• Can power:
  • ESP32/Arduino via USB
  • Sensors, fans, LED strips (within current limits)

Usage Tips

• Input voltage <1V: Output current drops significantly. Use fresh batteries or capacitors to buffer.
• Avoid overloading: Drawing >600 mA may cause voltage drop or shutdown.
• Heat management: Some models get warm under load. Ensure ventilation.
• Check polarity: Reversed input can damage the module.

Example Applications

• Powering ESP32 from AA batteries
• Boosting solar panel output for USB charging
• Emergency USB power from single-cell battery
• Portable sensor nodes or wearable devices

Troubleshooting