DC-DC USB Charger 3.7-5V 600ma Boost Converter

A miniature PFM-controlled boost converter that accepts any DC input from 0.9 V to 5 V and outputs a stable 5 V at 500–600 mA — enough to charge phones, power microcontrollers, and run USB peripherals from a single AA battery or nearly depleted LiPo cell. A USB-A female output means plug-and-go compatibility with any USB device.

🔹 Key Applications

• Emergency USB phone charging from AA or AAA batteries
• Boosting a single LiPo cell (3.7 V) to USB 5 V output
• Powering Arduino or ESP8266 from almost-dead AA batteries
• Portable power bank core module for DIY projects
• Solar cell USB power regulation from low-voltage panels

🔹 Why Choose This Module?

• 0.9 V minimum input — extracts every last milliamp from depleted batteries
• PFM control — optimised for low-load efficiency
• USB-A female output — universal device compatibility
• Stable 5 V output — safe for phones, tablets, and microcontrollers
• Compact module — easy to integrate into custom enclosures

🔹 Technical Specifications

• Topology: PFM boost controller
• Input Voltage: 0.9 V – 5 V DC
• Output Voltage: 5 V DC
• Output Current: 500 – 600 mA
• Output Connector: USB-A female

🔹 What's Included

1 × 3.7–5 V to 5 V USB Boost Converter Module

🔹 Pro Tip

💡 With two AA batteries in series (3 V nominal), this module can deliver 200 mA of USB power — enough to charge a phone slowly or run an Arduino Nano wirelessly. For a higher current portable power bank, pair with a TP4056 charger module and a 3.7 V 18650 cell for a complete charge/discharge system.

⚠️ Note: Always ensure proper heat dissipation and correct voltage configuration before powering connected devices.