Story
A compact and powerful USB power supply based on the XL4015 buck converter IC.
Designed to deliver stable 5V up to 5A — perfect for powering Raspberry Pi, ESP32, Arduino, and USB gadgets.
- 🔌 Input Voltage: 8V – 36V DC
- ⚡ Output Voltage: Fixed 5V
- 🔋 Maximum Current: 5A continuous
- 🔒 Reverse Polarity Protection (SS1045 Schottky)
- 📊 Stable Output with 330 µF electrolytic + ceramic capacitors
- 🟢 Power LED Indicator
- 🖥️ USB-A Output Port (5V)
- 🐧 Tested with Raspberry Pi 4 – no undervoltage warnings
| No. | Quantity | Component | Value / Part No. | Package | Notes |
|---|---|---|---|---|---|
| 1 | 1 | IC | XL4015E1 | TO-263-5 | Buck regulator |
| 2 | 1 | Inductor | 47 µH / 6A | SMMS1360 | Power inductor |
| 3 | 1 | Diode | SS1045 | SMC | Schottky rectifier |
| 4 | 1 | Capacitor | 220 µF / 50V | Electrolytic | Input filter |
| 5 | 1 | Capacitor | 330 µF / 25V | Electrolytic | Output filter |
| 6 | 3 | Capacitors | 1 µF | 1206 SMD | Ceramic |
| 7 | 1 | Capacitor | 33 nF | 1206 SMD | Loop compensation |
| 8 | 2 | Resistors | 3.3k, 10k | 1206 SMD | Voltage feedback |
| 9 | 1 | Resistor | 330 Ω | 1206 SMD | LED current limit |
| 10 | 1 | LED | Green SMD | 1205 | Power indicator |
| 11 | 1 | USB Connector | USB-A Female | Through-hole | Output port |
| 12 | 1 | DC Jack | 5.5mm barrel | Through-hole | Input connector |
📷 Schematic
3D render of the finished board:
PCB layout (top copper):
- 🐧 Power Raspberry Pi 3/4 (stable 5V/5A supply)
- ⚡ Supply ESP32, Arduino, STM32 projects
- 💡 Power 5V LED strips
- 📱 Charge USB-powered gadgets (phones, tablets)
- 📡 Use with routers, SBCs, or dev kits
- 🔋 Add USB D+/D– resistor divider for fast charging (up to 2A)
- 🔒 Replace Schottky diode with P-MOSFET reverse polarity protection for higher efficiency
- 🔥 Add a polyfuse on USB output for overcurrent protection
- 📏 Optional: make a multi-output version (5V/9V/12V) with multiple XL4015s
This project is open-source hardware 🛠️.
You’re free to use, modify, and improve it — just give credit when sharing ❤️.
Designed by ElectroIoT.in
