PicoPSU
About the PicoPSU PCB
PicoPSU is an open source PCB design by MECSEM, published on GitHub under the GPL-3.0 license. It is a 4-layer board measuring 95 × 74 mm, with 108 components from 38 distinct parts.
Other key parts include the LM25141. By type, the board carries 51 capacitors, 33 resistors, 11 diodes, 6 inductors, 4 transistors and 3 ICs.
It belongs with the power & battery designs in this gallery.
From the project
All the electrical designs for MECSEM.
KiCad sources for all the PCBs in the microscope.
This repository contains only the electrical design: schematics, PCB layouts, and KiCad symbol/footprint library.
A Linux Mint host PC inside the chassis (powered by the in-chassis PicoPSU) commands two central RP2350 controllers over USB:
HV Controller: the master optics-column controller. Drives source bias, lenses, deflectors, the scintillator detector, raster scan, and the PMT readout. Bridges the floating cathode side onto USB. LV Controller: the vacuum subsystem state machine: roughing pump, turbopump VFD (RS-485), isolation valve…
Main components on the PicoPSU
PicoPSU bill of materials (BOM)
108 components, 38 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 3 | LM25141 | VQFN-24_L4.0-W4.0-P0.50-BL-EP2.5 | U2, U3, U4 |
| 1 | AO3400A Alpha & Omega Semicon | Q_SOT-23 | Q1 |
| 2 | HL2310A hongjiacheng | Q_SOT-23 | Q15, Q17 |
| 1 | HL2309 hongjiacheng | Q_SOT-23 | Q16 |
| 1 | Yellow Hubei KENTO Elec | D_0805 | D1 |
| 1 | Green Hubei KENTO Elec | D_0805 | D2 |
| 1 | White Hubei KENTO Elec | D_0805 | D3 |
| 1 | MM1W10 hongjiacheng | D_SOD-123 | D4 |
| 2 | SS52F hongjiacheng | D_SMAF | D5, D6 |
| 3 | 1N5819WS Guangdong Hottech | D_SOD-323 | D7, D8, D9 |
| 2 | B5817W hongjiacheng | D_SOD-123 | D10, D11 |
| 3 | 330nH | WE_Inductor_744308033 | L1, L3, L5 |
| 3 | 470nH | IND-SMD_L13.2-W12.9 | L2, L4, L6 |
| 8 | 330uF | CAP-SMD_BD8.0-L8.3-W8.3-LS9.0-FD | C1, C10, C19, C25, C34, C40, C49, C50 |
| 3 | 10nF Samsung Electro-Mechanics | C_0402 | C2, C3, C4 |
| 18 | 10uF | C_1210_3225Metric | C5, C6, C8, C9, C17, C18, C20, C21 +10 |
| 3 | 10nF FH(Guangdong Fenghua Advanced Tech) | C_0603 | C7, C22, C37 |
| 3 | 100nF YAGEO | C_0603 | C11, C26, C41 |
| 3 | 100nF Samsung Electro-Mechanics | C_0402 | C12, C27, C42 |
| 3 | 220nF Samsung Electro-Mechanics | C_0402 | C13, C28, C43 |
Show 18 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 3 | 2.2uF Samsung Electro-Mechanics | C_0805 | C14, C29, C44 |
| 3 | 220nF Samsung Electro-Mechanics | C_0805 | C15, C30, C45 |
| 3 | 22nF FH(Guangdong Fenghua Advanced Tech) | C_0402 | C16, C31, C46 |
| 1 | 10uF | C_1206_3216Metric | C78 |
| 1 | 300Ω UNI-ROYAL(Uniroyal Elec) | R_0402 | R1 |
| 4 | 10kΩ UNI-ROYAL(Uniroyal Elec) | R_0402 | R2, R4, R10, R34 |
| 1 | 1kΩ UNI-ROYAL(Uniroyal Elec) | R_0402 | R3 |
| 2 | 220Ω UNI-ROYAL(Uniroyal Elec) | R_0402 | R5, R6 |
| 2 | 2.2kΩ UNI-ROYAL(Uniroyal Elec) | R_0402 | R7, R17 |
| 2 | 20kΩ UNI-ROYAL(Uniroyal Elec) | R_0402 | R8, R14 |
| 3 | 43kΩ UNI-ROYAL(Uniroyal Elec) | R_0603 | R9, R20, R24 |
| 2 | 15kΩ UNI-ROYAL(Uniroyal Elec) | R_0402 | R11, R15 |
| 1 | 5.6kΩ UNI-ROYAL(Uniroyal Elec) | R_0402 | R12 |
| 1 | 3.9kΩ UNI-ROYAL(Uniroyal Elec) | R_0402 | R13 |
| 1 | 8.2kΩ UNI-ROYAL(Uniroyal Elec) | R_0402 | R16 |
| 4 | 4.7kΩ UNI-ROYAL(Uniroyal Elec) | R_0402 | R18, R19, R31, R32 |
| 6 | 10Ω UNI-ROYAL(Uniroyal Elec) | R_0402 | R21, R22, R25, R26, R29, R30 |
| 3 | 18kΩ UNI-ROYAL(Uniroyal Elec) | R_0402 | R23, R27, R28 |
PicoPSU design files
The KiCad project lives in the MECSEM/electrical repository on GitHub; these links point at the commit this page was built from.
- LayoutPicoPSU/PicoPSU.kicad_pcb
- SchematicPicoPSU/PicoPSU.kicad_sch
PicoPSU: common questions
How big is the PicoPSU PCB?
The PicoPSU measures 95 × 74 mm, has 4 copper layers and is 1.6062 mm thick.
How many components are on the PicoPSU?
108 components, from 38 distinct parts. The full bill of materials is listed on this page.
Where can I download the PicoPSU design files?
From the MECSEM/electrical repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the PicoPSU design in my own project?
Yes, under the terms of its GPL-3.0 license, which MECSEM chose for the repository.
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