# Electrical Gray Wall-E ## Description Bidirectional 5–24 V / 10 A Synchronous 4-Switch Buck-Boost Converter with STM32F103 Control and UART Interface ## Project Details - **Owner:** e5o7srngz8 - **Created:** 1/9/2026 - **Last Updated:** 1/9/2026 - **Visibility:** Public - **Reference Design URL:** https://www.st.com/resource/en/application_note/an4885-bidirectional-dc-dc-converter-with-stm32-mcu-stmicroelectronics.pdf - **Manufacturing Quantity Target:** 25 - **Max Input Voltage:** 24V - **Design Architecture Summary:** Bidirectional 5–24 V / 10 A synchronous 4-switch buck-boost DC/DC converter using discrete MOSFET H-bridge, dedicated half-bridge gate drivers, current/voltage/temperature sensing and STM32F103C8T6 MCU for digital control and UART telemetry. - **Reliability Target (MTBF):** 50000hours - **Power Requirements:** Power-over-Ethernet - **Software:** Bare metal - **Operating Voltage:** 24V - **Max Output Voltage:** 24V - **Max Current:** 10A - **Domain:** Energy - **Connectivity:** USB - **Operating Temperature:** -20 to 85 °C - **Human Interface:** Buttons - **License:** https://ohwr.org/project/cernohl/wikis/home ## Key Components ### J1 — [ARM JTAG SWD 10Pin 0.05" Connector](https://www.flux.ai/vasy_skral/arm-jtag-swd-10pin-005-connector~y0b.md) - Datasheet URL: https://suddendocs.samtec.com/catalog_english/ftsh_smt.pdf - Part Type: Connector - Manufacturer Name: Analog Devices - Role Details: SWD programming/debug interface - Manufacturer Part Number: FTSH-105-01-L-DV-007-K - Role: Connector - Package: 10-pin 1.27mm SMT **Pins:** - ~RESET~ [pin 10] - GND [pin 5] - GND [pin 3] - GNDDetect [pin 9] - NC/TDI [pin 8] - SWDCLK/TCK [pin 4] - SWDIO/TMS [pin 2] - SWO/TDO [pin 6] - VTref [pin 1] ### Q1 — [TSM200N03DPQ33 RGG](https://www.flux.ai/adrian95/tsm200n03dpq33-rgg~3d.md) - Part Type: Transistor - Manufacturer Part Number: TSM200N03DPQ33 RGG - Role: Power Conversion - Datasheet URL: https://services.taiwansemi.com/storage/resources/datasheet/TSM200N03D_B1710.pdf - Manufacturer Name: Taiwan Semiconductor Corporation - Role Details: Power MOSFET for bidirectional four-switch buck-boost converter - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - DRAIN1_1 [pin 7] - DRAIN1_2 [pin 8] - DRAIN1_3 [pin 10] - DRAIN2_1 [pin 5] - DRAIN2_2 [pin 6] - DRAIN2_3 [pin 9] - GATE1 [pin 2] - GATE2 [pin 4] - SOURCE1 [pin 1] - SOURCE2 [pin 3] ### Q2 — [TSM200N03DPQ33 RGG](https://www.flux.ai/adrian95/tsm200n03dpq33-rgg~3d.md) - Manufacturer Part Number: TSM200N03DPQ33 RGG - Datasheet URL: https://services.taiwansemi.com/storage/resources/datasheet/TSM200N03D_B1710.pdf - Role Details: Power MOSFET for bidirectional four-switch buck-boost converter - Role: Power Conversion - Part Type: Transistor - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Taiwan Semiconductor Corporation **Pins:** - DRAIN1_1 [pin 7] - DRAIN1_2 [pin 8] - DRAIN1_3 [pin 10] - DRAIN2_1 [pin 5] - DRAIN2_2 [pin 6] - DRAIN2_3 [pin 9] - GATE1 [pin 2] - GATE2 [pin 4] - SOURCE1 [pin 1] - SOURCE2 [pin 3] ### Q3 — [TSM200N03DPQ33 RGG](https://www.flux.ai/adrian95/tsm200n03dpq33-rgg~3d.md) - Manufacturer Part Number: TSM200N03DPQ33 RGG - Role Details: Power MOSFET for bidirectional four-switch buck-boost converter - Datasheet URL: https://services.taiwansemi.com/storage/resources/datasheet/TSM200N03D_B1710.pdf - Role: Power Conversion - Part Type: Transistor - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Taiwan Semiconductor Corporation **Pins:** - DRAIN1_1 [pin 7] - DRAIN1_2 [pin 8] - DRAIN1_3 [pin 10] - DRAIN2_1 [pin 5] - DRAIN2_2 [pin 6] - DRAIN2_3 [pin 9] - GATE1 [pin 2] - GATE2 [pin 4] - SOURCE1 [pin 1] - SOURCE2 [pin 3] ### Q4 — [TSM200N03DPQ33 RGG](https://www.flux.ai/adrian95/tsm200n03dpq33-rgg~3d.md) - Manufacturer Name: Taiwan Semiconductor Corporation - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Transistor - Role Details: Power MOSFET for bidirectional four-switch buck-boost converter - Manufacturer Part Number: TSM200N03DPQ33 RGG - Datasheet URL: https://services.taiwansemi.com/storage/resources/datasheet/TSM200N03D_B1710.pdf - Role: Power Conversion **Pins:** - DRAIN1_1 [pin 7] - DRAIN1_2 [pin 8] - DRAIN1_3 [pin 10] - DRAIN2_1 [pin 5] - DRAIN2_2 [pin 6] - DRAIN2_3 [pin 9] - GATE1 [pin 2] - GATE2 [pin 4] - SOURCE1 [pin 1] - SOURCE2 [pin 3] ### U1 — [STM32F103C8T6](https://www.flux.ai/vasy_skral/stm32f103c8t6~isy.md) - Datasheet URL: https://www.st.com/resource/en/datasheet/stm32f103cb.pdf - Package: LQFP-48 - Symbol Style: Parametric - Manufacturer Name: STMicroelectronics - License: https://creativecommons.org/licenses/by/4.0/ - Role: Microcontroller - Role Details: Main MCU - Part Type: Microcontroller - Manufacturer Part Number: STM32F103C8T6 **Pins:** - BOOT0 [pin 44] - NRST [pin 7] - PA0 [pin 10] - PA1 [pin 11] - PA10 [pin 31] - PA11 [pin 32] - PA12 [pin 33] - PA13 [pin 34] - PA14 [pin 37] - PA15 [pin 38] - PA2 [pin 12] - PA3 [pin 13] - PA4 [pin 14] - PA5 [pin 15] - PA6 [pin 16] - PA7 [pin 17] - PA8 [pin 29] - PA9 [pin 30] - PB0 [pin 18] - PB1 [pin 19] - PB10 [pin 21] - PB11 [pin 22] - PB12 [pin 25] - PB13 [pin 26] - PB14 [pin 27] - PB15 [pin 28] - PB2 [pin 20] - PB3 [pin 39] - PB4 [pin 40] - PB5 [pin 41] - PB6 [pin 42] - PB7 [pin 43] - PB8 [pin 45] - PB9 [pin 46] - PC13 [pin 2] - PC14 [pin 3] - PC15 [pin 4] - PD0 [pin 5] - PD1 [pin 6] - VBAT [pin 1] - VDD [pin 24] - VDD [pin 36] - VDD [pin 48] - VDDA [pin 9] - VSS [pin 35] - VSS [pin 47] - VSS [pin 23] - VSSA [pin 8] ### U2 — [IR2110SPBF](https://www.flux.ai/lcsc/ir2110spbf~zbd5.md) - Role: Gate Driver - Datasheet URL: https://assets.lcsc.com/datasheet/szlcsc/Download-ISO9001-Certification.pdf - JLCPCB Part Class: Extended Part - Package: SOIC-16 - Product Info Url: https://lcsc.com/product-detail/MOS-Drivers_Infineon-Technologies-IR2110SPBF_C537554.html - Part Type: Gate Drive ICs - LCSC Part Number: C537554 - Manufacturer Name: Infineon(英飞凌) - Package or Case Code: SOIC-16_L10.3-W7.5-P1.27-LS10.3-BL - Role Details: High-side/low-side MOSFET gate driver for power stage - Manufacturer Part Number: IR2110SPBF **Pins:** - COM [pin 2] - HIN [pin 12] - HO [pin 8] - LIN [pin 14] - LO [pin 1] - NC [pin 4] - NC [pin 5] - NC [pin 9] - NC [pin 10] - NC [pin 16] - SD [pin 13] - VB [pin 7] - VCC [pin 3] - VDD [pin 11] - VS [pin 6] - VSS [pin 15] ### U3 — [MCP1700T-3302E-TT](https://www.flux.ai/adrian95/mcp1700t-3302e-tt~h60.md) - Manufacturer Name: Microchip Technology - Package: SOT-23 - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://datasheet.octopart.com/MCP1700T-3302E/TT-Microchip-datasheet-532260.pdf - Manufacturer Part Number: MCP1700T-3302E/TT - Role Details: 3.3V regulator for MCU power supply - Role: Linear Regulator - Part Type: Integrated Circuit **Pins:** - GND [pin 1] - VI [pin 3] - VO [pin 2] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/e5o7srngz8/electrical-gray-wall-e~by](https://www.flux.ai/e5o7srngz8/electrical-gray-wall-e~by).* --- *Generated from [https://www.flux.ai/e5o7srngz8/electrical-gray-wall-e~by](https://www.flux.ai/e5o7srngz8/electrical-gray-wall-e~by)*