BQ2r2
About the BQ2r2 PCB
BQ2r2 is an open source PCB design by bootchk, published on GitHub. It is a 2-layer board measuring 13.5 × 12.8 mm, with 10 components from 9 distinct parts.
Other key parts include the BQ25570.
It belongs with the power & battery and test & measurement designs in this gallery.
From the project
This project is a small solar-harvesting power supply based on the Texas Instruments BQ25570. The board provides a regulated output with a nominal maximum of 3.2 V.
This project is a small solar-harvesting power supply based on the Texas Instruments BQ25570. The board provides a regulated output with a nominal maximum of 3.2 V.
Design intent: - Minimize PCB area - Minimize part count - Use only a subset of BQ25570 features
Primary objectives: - Charge large output-side storage capacitors efficiently - Limit the regulated output to 3.2 V
Main components on the BQ2r2
BQ2r2 bill of materials (BOM)
10 components, 9 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | BQ25570 | QFN-20-1EP_3.5x3.5mm_P0.5mm_EP2x2mm | U1 |
| 1 | 0.1uF MLCC | C_0603_1608Metric | CByp1 |
| 2 | 4.7uF MLCC Taiyo | C_0805_2012Metric | CIn1, CStor1 |
| 1 | 22uF MLCC Samsung | C_0805_2012Metric | COut1 |
| 1 | 0.01uF MLCC Kyocera | C_0603_1608Metric | CRef1 |
| 1 | 22UH 22uH Wurth | Wurth2828 | LBoost1 |
| 1 | 10UH 10uH Wurth | Wurth2828 | LBuck1 |
| 1 | 3.16M 1% 0.1W | R_0603_1608Metric | RProg1 |
| 1 | 1.91M | R_0603_1608Metric | RProg2 |
BQ2r2 design files
The KiCad project lives in the bootchk/BQ2r2 repository on GitHub; these links point at the commit this page was built from.
- LayoutBQ2.kicad_pcb
- SchematicBQ2.kicad_sch
- BOMBOM.csv
BQ2r2: common questions
How big is the BQ2r2 PCB?
The BQ2r2 measures 13.5 × 12.8 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the BQ2r2?
10 components, from 9 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the BQ2r2 design files?
From the bootchk/BQ2r2 repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the BQ2r2 design in my own project?
The repository has no license, so all rights stay with bootchk. Use it as a reference, and ask the author before reusing the design.
Similar boards
Display Carrier
AxxAxx
35.6 × 58.2 mm5 parts2LGPL-3.01.7k
ControllerCurrentShuntAddOn
stuartpittaway
26 × 16.9 mm9 parts2LCC-BY-NC-4.01.1k
TemperaturePCB PANEL
116 × 75.5 mm178 parts2LCC-BY-NC-4.01.1k
Module 16S PassiveBalanceAddOn
61 × 74 mm86 parts2LCC-BY-NC-4.01.1k
ProgrammingAdapter
10.5 × 83 mm3 parts2LCC-BY-NC-4.01.1k
Cube batteryboard
willem-pennings
95 × 95 mm4 parts2LGPL-3.01.1k