2 layers54 × 12.5 mm
BrodBoost C2
axiometa/BrodBoost-C2
USB - C Breadboard Powersupply: BrodBoost-C
31 parts36CERN-OHL-S-2.0
2 layers52 × 24 mm
Modular Power USBC
domesticmouse/Modular-Power-USBC- Size
- 52 × 24 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 23
- Nets
- 18
- Pads
- 76
- Tracks, vias
- 93, 6
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 30 Apr 2026
- Updated
- 1 May 2026
Overview
Modular Power USBC is an open-source printed circuit board by domesticmouse, from the domesticmouse/Modular-Power-USBC repository on GitHub, published under the CERN-OHL-S-2.0 licence. It is a 2-layer board of 52 × 24 mm with 23 parts on 18 nets, routed with 93 tracks and 6 vias.
It is built around the A0512S-1W, LM66100DCK and TPS22918DBV. Its parts include 6 capacitors, 6 resistors, 3 connectors, 2 ICs and 2 diodes.
Main components
3
A0512S-1W
SIP,19.6x6mm-40℃~+85℃ 1.5kV 10.1mm 12mA 19.6mm 1W 2 220uF 400kHz 50mVp-p 5V 6mm 81% Short Circuit Protection ±12V ±42mA 塑封型 非稳压型 SIP,19.6x6mm Isolated Power Modules ROHSDEXU ElectronicsIsolated Power Modules
LM66100DCK
SC-70-6-40℃~+125℃ 1 1.5A 1.5V~5.5V 150nA 95mΩ Integrated FET Reverse current blocking、Reverse polarity protection、With enable SC-70-6 ORing Controllers ROHSTexas InstrumentsPower Distribution Switches
TPS22918DBV
SOT-23-6-40℃~+105℃ 1 1V~5.5V 2A 53mΩ Active High Load Switch Output discharge function、Soft-start、Integrated charge pump SOT-23-6 Power Distribution Switches ROHSTexas InstrumentsPower Distribution Switches
README
README.mdModular-Power-USBC
Project Overview
This project provides a compact, high-efficiency power solution for modular electronics (such as Eurorack synthesizers or analog prototyping boards). It converts standard 5V USB-C power into clean, dual ±12V rails.
Key Features
- USB-C Input: Uses a power-only 6-pin receptacle for durability and simplicity.
- Dual Rail Output: Provides ±12V at up to 83mA per rail (2W total).
- Comprehensive Protection: Features overcurrent, reverse polarity, and back-drive protection.
- Controlled Startup: Integrated load switch with a physical toggle for safe power-up.
- Indicator LEDs: Visual confirmation for both positive and negative rails.
Main Technologies
- EDA Tool: KiCad (Project files version 20260306, KiCad 10.0 or newer).
- Major Components:
- DC-DC Converter:
A0512S-2WR2(Isolated 2W module). - Ideal Diode:
LM66100(Reverse polarity & back-drive protection). - Load Switch:
TPS22918(Gated power control). - Filtering: Ferrite bead and 0805 SMD decoupling capacitors.
- Protection: Resettable Polyfuse (
F1).
- DC-DC Converter:
Circuit Architecture
The power path is designed for reliability and safety:
- Input & Filtering: 5V enters via
J1. It is immediately protected by a Polyfuse and filtered by a Ferrite Bead to reduce high-frequency noise. - Polarity Protection: An
LM66100ideal diode provides extremely low-loss protection against reverse voltage on the input. - Gated Control: The
TPS22918load switch acts as the master gate. A physical SPDT slide switch (SW1) controls the enable pin, allowing the user to safely toggle the ±12V rails. - Isolated Conversion: The
A0512S-2WR2performs the heavy lifting, converting the 5V input to isolated ±12V outputs. This isolation helps prevent ground loops between the USB source and the analog circuitry. - Output Rail: The dual rails are broken out to 2.54mm headers (
J2,J3) for plugging into a breadboard.
Directory Structure
Modular-Power-USBC.kicad_sch: Main schematic file.Modular-Power-USBC.kicad_pcb: PCB layout file.Modular-Power-USBC.pretty/: Local footprint library for custom components.ModularPower.kicad_sym: Local symbol library.production/: Fabrication-ready files (Gerbers, BOM, Pick-and-Place).
Project Status
- Schematic: Functional design complete.
- ERC Status: 1 Error (Pin 2 of PS1 not driven). Note: This is an ERC artifact due to a missing
PWR_FLAGon theGNDnet; the electrical connection is correct. - Layout: Complete.
Building and Production
KiCad Workflow
- Open
Modular-Power-USBC.kicad_proin KiCad 10.0+. - Fabrication files are generated using the KiCad Fabrication Toolkit in the
production/folder. - An Interactive HTML BOM is available in
bom/ibom.htmlfor hand-assembly.
Development Conventions
- Components: Prefer LCSC part numbers (documented in
bom.csvand component properties) for optimized sourcing via JLCPCB. - Footprints: Custom footprints are maintained in the local
.prettylibrary.
Parts
23| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 10uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C3, C6 |
| 3 | 5k1Ω | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2, R5 |
| 2 | 1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C4, C5 |
| 2 | 2k2Ω | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3, R4 |
| 1 | +12v Rail | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | J2 |
| 1 | -12V Rail | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | J3 |
| 1 | 100Ω | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R6 |
| 1 | A0512S | Converter_DCDC:Converter_DCDC_XP_POWER-IAxxxxS_THT | PS1 |
| 1 | BLUE | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D2 |
| 1 | FerriteBead | Modular-Power-USBC:FerriteBead_0805_2012Metric_Pad1.20x1.40mm_HandSolder | FB1 |
| 1 | LM66100 | Package_TO_SOT_SMD:SOT-363_SC-70-6 | U1 |
| 1 | Polyfuse | Fuse:Fuse_0805_2012Metric_Pad1.15x1.40mm_HandSolder | F1 |
| 1 | RED | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D1 |
| 1 | SW_SPDT | Button_Switch_THT:SW_Slide_SPDT_Straight_CK_OS102011MS2Q | SW1 |
| 1 | TPS22918 | Package_TO_SOT_SMD:SOT-23-6 | U2 |
| 1 | USB_C_Receptacle_PowerOnly_6P | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-17 | J1 |
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Questions
How big is the Modular Power USBC PCB?
It measures 52 × 24 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Modular Power USBC use?
23 parts, built around the A0512S-1W, LM66100DCK and TPS22918DBV. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Modular Power USBC KiCad files?
From the domesticmouse/Modular-Power-USBC repository on GitHub, at the commit this page was made from: the board is Modular-Power-USBC.kicad_pcb and its schematic Modular-Power-USBC.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Modular Power USBC design in my own project?
Its repository publishes it under the CERN-OHL-S-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).