0.0.2
This prototype power module was developed as part of a learning initiative. Manufactured and assembled by JLCPCB, the boards were delivered in 15 days using the “Global Standard Direct Line” shipping method. The cost was $116.28 CAD for a set of 5 boards. All functions, including the battery level monitor, operate flawlessly. During testing, the charging/switching IC exhibited slight warmth, which was within acceptable limits. Additionally, a 3.3k resistor was mistakenly placed where a 330-ohm resistor was intended. Despite this, the module performed without any issues.
0.0.2 Components
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Charing and switching IC: BQ2407
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PCIe Specs PDF (page 92 and 136)
BOM
| Comment | Designator | Footprint | LCSC Part Number | JLCPCB Basic? |
|---|---|---|---|---|
| 0.01Ohm | R11 | 1206 | C844910 | no |
| 0.1uF | C1 | 0402 | C1525 | yes |
| 1M | R2, R4 | 0402 | C26083 | yes |
| 1uF | C5, C7 | 0402 | C52923 | yes |
| 1uH | L2 | 1008 | C882955 | no |
| 1.5K | R5, R7 | 0402 | C25867 | yes |
| 1.8K | R8 | 0603 | C4177 | yes |
| 2.2K | R3 | 0402 | C25879 | yes |
| 3K | R16 | 0603 | C4211 | yes |
| 3.3K | R1 | 0402 | C25890 | yes |
| 4.7uF | C6, C8 | 0402 | C23733 | yes |
| 5.1K | R12, R13 | 0402 | C25905 | yes |
| 10K | R6, R14, R15 | 0402 | C25744 | yes |
| 22uF | C9 | 0603 | C59461 | yes |
| 47uF | C10 | 0805 | C16780 | yes |
| 91K | R18 | 0402 | C1161 | no |
| 470nF | C4 | 0603 | C1623 | yes |
| 510K | R17 | 0603 | C23192 | yes |
| Battery Monitor | U4 | SON-12-EP(2.5x4) | C473397 | no |
| Battery Protection IC | U1 | WSON (6) | C183096 | no |
| Buck-Boost | U5 | SOT-583 | C5219190 | no |
| Charger/Switcher | U2 | VQFN (16) | C140288 | no |
| FET | Q1, Q2 | VSON-8(3.3x3.3) | C2861720 | no |
| JST Connector | P1 | SMD,P=2mm | C295747 | no |
| PCIe Gold Fingers | J2 | nan | nan | nan |
| Red LED | D1 | 0603 | C2286 | yes |
| USB-C | J1 | nan | nan | nan |
| White LED | D2 | 0603 | C2290 | yes |