Exploded stackup separates every fabrication layer (6 mm per slot) so you can see the whole build, including the inner copper layers 2 and 15 that no schematic-level 3D view shows. Assembled is the real board: 3D copper traces visible through the translucent soldermask. Drag to orbit, scroll to zoom. This viewer is the wiki's own Adom Babylon viewer with a model toggle.
A buck-boost battery charger around the Texas Instruments BQ25792 (1S to 4S, up to 5 A, USB-C + DC input, I2C control, integrated power path and 16-bit ADC), designed by Adonis in Fusion 360 Electronics. It integrates 14 Adom machine pins for the modular stack. FR4 outline 50.40 x 26.40 mm, 109 components, 4-layer.
From the design rules: layerSetup (1+2*15+16) = 4 copper layers, mtCopper 0.035 mm each. A
4-layer board is fabricated as copper / prepreg / copper / core / copper / prepreg / copper: the FR4
is not one slab, it is prepreg + core + prepreg. Dielectric split fitted to the measured board
(1.516 mm total): outer prepregs 0.200 each, core 1.046. Exact z in mm:
| # | Layer | z bottom | z top | thickness |
|---|---|---|---|---|
| 1 | Components (seated on top mask) | 1.582 | varies | per part |
| 2 | Top silkscreen | 1.582 | 1.582 | ink |
| 3 | Top soldermask | 1.516 | 1.582 | 0.066 |
| 4 | Copper L1 (top, traces) | 1.516 | 1.551 | 0.035 |
| 5 | Top prepreg (FR4) | 1.316 | 1.516 | 0.200 |
| 6 | Copper L2 (inner) | 1.281 | 1.316 | 0.035 |
| 7 | Core (FR4) | 0.235 | 1.281 | 1.046 |
| 8 | Copper L15 (inner) | 0.200 | 0.235 | 0.035 |
| 9 | Bottom prepreg (FR4) | 0.000 | 0.200 | 0.200 |
| 10 | Copper L16 (bottom) | -0.035 | 0.000 | 0.035 |
| 11 | Bottom soldermask | -0.065 | 0.000 | 0.065 |
| 12 | Bottom silkscreen | -0.065 | -0.065 | ink |
Copper L1 and L16 are the real exported 3D bodies. Inner copper L2 and L15 are the real gerber
layers (copper_l2.G1, copper_l3.G2); Fusion does not export inner layers as bodies. Both
soldermasks come from their gerbers with real pad openings.
| File | What |
|---|---|
bq25792-charger.f3d | Fusion 360 archive (native) |
bq25792-charger.step | STEP 3D (full board) |
bq25792-charger.usdz | USDZ 3D (PBR) |
bq25792-charger.brd / .sch | EAGLE board + schematic source |
bq25792-charger.fbrd / .fsch | Fusion-native board + schematic |
bq25792-charger-gerbers.zip | Fabrication gerbers + drill (13 files) |
bq25792-charger-bom.csv | Bill of materials |
bq25792-charger-cpl.csv | Pick and place |
bq25792-charger-exploded.glb / -assembled.glb | The two 3D models above |
Source of truth: the live Fusion 360 design (Main project, v222). Pipeline: Fusion exports (STEP, gerbers, EAGLE source) processed with the Adom step2glb molecule optimizer; stackup measured from the exported bodies + design rules.