Pixel 7 Car Power Mod
Thought for 10 sec
I’ll retry the complete datasheet and circuit audit now, covering every active device, the full power path, fault cases, thermal limits, and the 46 × 80 × 5 mm envelope. I’ll save the detailed pass/fail report in the project files and make no circuit changes unless a separate correction step is warranted.
Worked for 6 mins 33 sec
Created a project doc
Full Datasheet and Circuit Validation
Project: Pixel 7 USB-C Battery Emulator Validation type: Read-only schematic/BOM/connectivity/datasheet review
Full datasheet and circuit validation completed. Current verdict: FAIL—do not connect this revision to the phone yet. The main blockers are the undersized LM5176 current shunt, inadequately driven Q8, unverified charge-back protection, provisional compensation/capacitors, and oversized PCB.
Detailed calculations, component-by-component results, citations, and corrections are in Full Datasheet and Circuit Validation.
Suggested next steps
- Correct the safety/blocker findings.
- Revalidate the revised power stage and fault protection.
- Then redesign the PCB for the 46 × 80 × 5 mm envelope.
Fix and revalidate
Fix blocker findings
Find better parts
Review capacitor choices
Update protection logic
Prepare compact layout
Refine this doc
Ask about this doc
Pixel 7 USB-C Battery Emulator — Block Diagram
Functional architecture
Text
Pixel USB-C assembly (phone owns CC/PD) VBUS_TAP / GND | v [30 V TVS + eFuse/hot-swap + reverse blocking] | v [UVLO / inrush / current limit] | v [4-switch synchronous buck-boost, 4.5–21 V -> 4.15 V] | +---- Kelvin VOUT_SENSE+ / VOUT_SENSE- | v [low-profile ceramic/polymer transient buffer + OVP] | v BMS_CELL+ / BMS_CELL- -> exposed cell-side pads of original Pixel battery BMS/flex High-current return: BMS_CELL- -> converter PGND -> protected VBUS return -> GND tap. The original BMS/flex gauge, authentication, and temperature interface remains connected to the phone.
Block sourcing decision record
Table
| Block | Reference classification | Decision |
|---|---|---|
| VBUS tap connector/test interface | None | Real low-profile connector/test-point parts from library |
| Input surge, inrush, UVLO, and reverse blocking | None | Datasheet-backed eFuse/hot-swap and TVS from scratch |
| High-current four-switch buck-boost | None pending broad reference search | Use a documented controller/reference circuit; import only if a focused matching block exists |
| Output OVP/current limit and capacitive buffer | None | Datasheet-backed protection plus generic low-profile passives |
| BMS cell-pad connector/test interface | None | Real low-profile connector/test-point parts from library |
Explicit exclusions
- No Li-ion/LiPo cell.
- No CC pull-down resistors and no second USB-PD controller.
- Emulator must not negotiate PD; the Pixel owns CC/PD.
- Emulator/BMS must not back-drive USB VBUS.
Functional architecture
Block sourcing decision record
Explicit exclusions
