USB-A to 9V Buck-Boost Converter PCB

This PCB design converts USB-A 5V input to regulated 9V output using a TPS63070 buck-boost converter IC.

Specifications

• Input: USB-A connector (5V, up to 500mA)
• Output: 9V regulated via screw terminals
• Efficiency: >90% typical
• Output current: Up to 300mA
• PCB size: 65mm x 25mm (2-layer)

Key Components

• U1: TPS63070 Buck-Boost Converter IC
• L1: 2.2µH Power Inductor
• C1: 10µF Input Capacitor
• C2: 22µF Output Capacitor
• R1, R2: Voltage divider for 9V output setting
• J1: USB-A Input Connector
• J2: Screw Terminal Output

Output Voltage Setting

The output voltage is set by resistor divider R1 (470kΩ) and R2 (100kΩ): Vout = 1.229V × (1 + R1/R2) = 1.229V × (1 + 4.7) = 9.0V

Files Included

• usb_9v_converter.sch - KiCad schematic file
• usb_9v_converter.kicad_pcb - KiCad PCB layout file
• BOM.csv - Bill of Materials
• README.md - This documentation

Manufacturing Notes

• Use 1.6mm standard PCB thickness
• HASL or ENIG finish recommended
• Minimum trace width: 0.2mm
• Minimum via size: 0.4mm drill, 0.8mm pad

Assembly Notes

1. Solder SMD components first (U1, L1, C1, C2, R1, R2)
2. Install through-hole components (J1, J2)
3. Test continuity before applying power
4. Verify 9V output with multimeter

Safety Warning

• Maximum input current: 500mA (USB spec limit)
• Do not exceed 9V output rating
• Use appropriate fusing on output if needed