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4 layers80 × 72 mmConvertisseur DC DC, the printed circuit board in 3D

Convertisseur DC DC

SurquinMathieu/buck-boost-converter

4-switch buck-boost DC/DC converter

Full screenGitHub.kicad_pcb
Size
80 × 72 mm
Copper layers
4
Thickness
1.61 mm
Parts
88
Nets
77
Pads
303
Tracks, vias
414, 103
Pours
6
Routed
Yes
KiCad
KiCad 9.0 (file 20241229)
Created
5 Jul 2026
Updated
7 Jul 2026

Overview

Convertisseur DC DC is an open-source printed circuit board by SurquinMathieu, from the SurquinMathieu/buck-boost-converter repository on GitHub. It is a 4-layer board of 80 × 72 mm with 88 parts on 77 nets, routed with 414 tracks and 103 vias.

It is built around the UCC27282DRC, TPS54360BDDAR and MCP1700T-3302E/TT(MS), with the IPD053N06NATMA1, 0685T6000-01 and 150060SS75000 among its other parts. Its parts include 26 capacitors, 26 resistors, 7 connectors, 6 ICs and 5 transistors. It belongs with the power boards and the STM32 boards of this library.

Main components

12

README

README.md

Buck-Boost DC/DC Converter

A 4-switch synchronous buck-boost converter built around an STM32G431CBT6, with a digital PI control loop, USB CDC telemetry, and a real-time web dashboard for monitoring and control.

Overview

This project implements a 4-switch buck-boost DC/DC converter. The STM32 runs a 300 kHz PWM control loop with real-time voltage sensing, feedforward + PI regulation, soft-start, and software UVLO protection. A companion web dashboard connects over USB to display live VIN/VOUT readings and lets you adjust the output setpoint from a browser.

Key specifications

ParameterValue
Input voltage10 – 40 V
Output voltage3 – 15 V
Max output current3 A
Switching frequency300 kHz
MCUSTM32G431CBT6 (Cortex-M4, 170 MHz)
Topology4-switch buck-boost

Features

  • Digital PI control with feedforward
  • Soft-start on power-up and on setpoint changes
  • Software UVLO (on: 12 V, off: 10 V) backed by a hardware UVLO on the gate-driver supply
  • Dual-simultaneous ADC sampling of VIN and VOUT, triggered by the timer
  • USB CDC telemetry (VIN, VOUT, target, duty cycle)
  • Web dashboard (Python/WebSocket backend + HTML/JS frontend) for live plotting and setpoint control
  • State-machine firmware architecture designed to be extended to boost and full buck-boost modes

Hardware

PCB

The converter uses four N-channel MOSFETs driven by two half-bridge gate drivers.

PCB layout

See hardware/kicad for the full KiCad project and hardware/bom for the bill of materials.

Firmware

See firmware/ for the STM32CubeIDE project.

Building

  1. Open the project in STM32CubeIDE (firmware/DC-DC-Converter.ioc)
  2. Build and flash to an STM32G431CBT6
  3. Connect over USB

Dashboard

Dashboard

The dashboard connects to the board's virtual COM port and streams VIN/VOUT/target data to a browser in real time over a local WebSocket, with a live waveform plot and a setpoint control.

Running it

bash
cd dashboard
pip install pyserial websockets
python server.py

Then open index.html in a browser. Update the PORT variable in server.py to match your board's COM port.

Parts

88
QtyValueFootprintReferences
160.1uFCapacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolderC2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17
410kResistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolderR12, R13, R14, R15
44.7RResistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolderR1, R2, R3, R4
4IPD053N06NATMA1Package_TO_SOT_SMD:TO-252-2Q1, Q2, Q3, Q4
310uFCapacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolderC22, C23, C24
2100kResistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolderR20, R21
22.2uFCapacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolderC20, C21
222RResistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolderR5, R6
25.1kResistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolderR10, R11
2UCC27282DR1_Converter_DCDC:UCC27282DRU5, U6
10685T6000-01Fuse:Fuse_1206_3216Metric_Pad1.42x1.75mm_HandSolderF1
11.4kResistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolderR9
1100uFCapacitor_SMD:C_Elec_10x10.2C25
1102kResistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolderR22
1124kResistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolderR23
1150060SS75000LED_SMD:LED_0603_1608MetricD2
115uHInductor_SMD:L_TDK_VLS6045EX_VLS6045AFL1
1180kResistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolderR24
11kResistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolderR8
11uFCapacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolderC19
1220uFCapacitor_SMD:C_Elec_8x10.2C26
1249kResistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolderR25
1330nFCapacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolderC18
133kResistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolderR16
139uHInductor_SMD:L_Bourns_SRP1770TA_16.9x16.9mmL2
13VTestPoint:TestPoint_Pad_D2.0mmTP4
13V3TestPoint:TestPoint_Pad_D2.0mmTP8
140.2kResistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolderR17
1560pFCapacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolderC1
1590kResistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolderR26
161.9kResistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolderR18
168RResistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolderR7
168kResistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolderR19
19VTestPoint:TestPoint_Pad_D2.0mmTP3
1BZX84C10Package_TO_SOT_SMD:SOT-23D1
1Boot0TS04-66-50-BK-260-SMT:SW_TS04-66-50-BK-260-SMTSW2
1Conn_01x02Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_VerticalJ5
1Conn_01x02Connector_JST:JST_PH_B2B-PH-K_1x02_P2.00mm_VerticalJ3
1Conn_01x05Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_VerticalJ7
1DMP6023LE-13Package_TO_SOT_SMD:SOT-223-3_TabPin2Q5
1FCR7350B1_Connector:FCR7350J2
1FCR7350R1_Connector:FCR7350J1
1GND1_Testpoint:5001TP6
1GNDTestPoint:TestPoint_Pad_D2.0mmTP7
1LOGOLogos:logo 11x11mG***
1MCP1700T-3302ETTPackage_TO_SOT_SMD:SOT-23U2
1RB162MM-60TRDiode_SMD:D_SOD-123D3
1REF3030EAIDBZRPackage_TO_SOT_SMD:SOT-23U3
1ResetTS04-66-50-BK-260-SMT:SW_TS04-66-50-BK-260-SMTSW1
1STM32G431CBTxPackage_QFP:LQFP-48_7x7mm_P0.5mmU1
1Screw_Terminal_01x021_Connector:TE_282837-2J6
1TPS54360BDDARPackage_SO:TI_SO-PowerPAD-8_ThermalViasU4
1USB4105-GF-AConnector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_HorizontalJ4
1USBLC6-2SC6Package_TO_SOT_SMD:SOT-23-6D4
1VbattTestPoint:TestPoint_Pad_D2.0mmTP5
1Vin1_Testpoint:5001TP2
1Vout1_Testpoint:5001TP1

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Questions

How big is the Convertisseur DC DC PCB?

It measures 80 × 72 mm and has 4 copper layers, 1.61 mm thick.

What parts does the Convertisseur DC DC use?

88 parts, built around the UCC27282DRC, TPS54360BDDAR, MCP1700T-3302E/TT(MS) and IPD053N06NATMA1. 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 Convertisseur DC DC KiCad files?

From the SurquinMathieu/buck-boost-converter repository on GitHub, at the commit this page was made from: the board is hardware/kicad/Convertisseur DC-DC.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the Convertisseur DC DC design in my own project?

Its repository states no licence, so its author keeps all rights: ask SurquinMathieu before reusing the design.