OpenFC-Lite Rev 3

RP2354B flight controller, 30.5 x 30.5 mm mounting, 6-layer. Input range moves to 3S-8S.

Power

Both bucks move from LMR51430YFDDCR to LMR51635YDDCR (U6, U16, C45262770).

	Rev 2 part	Rev 3 part
Operating VIN	4.5-36 V	4.3-60 V
Absolute max VIN	38 V	63 V
Output current	3 A	3.5 A
Reference	0.6 V	0.8 V

At 8S a full pack is 33.6 V. The old part's 38 V absolute maximum left 4.4 V of headroom, which is process tolerance rather than transient margin.

The reference change moves the feedback dividers: R22 6.49k to 8.87k (10 V rail, 9.82 V) and R24 13.7k to 19.1k (5 V rail, 4.99 V). Same SOT-23-6 land pattern, different pinout, so both buck corners were re-routed. Inductors stay 4.7 uH.

Gyro supply

U15 LP5912-1.8DRVR placed, together with D9 and R39. All three existed in the Rev 2 schematic but were never placed in the Rev 2 layout, which carried an unused NCV8187AMT180TAG footprint instead. That is why the gyro indicator never lit on Rev 2 hardware while the other three did.

Also in this revision

• Rev 2 ground shorts fixed on GPIO0-3, GPIO28 and GPIO31. UART0, GPS pads, M1/M4, UART1 and I2C0 are back on their intended pins, so the Rev 2 rework pin mapping in the Betaflight target can be retired.
• IMU is BMI270 (U9) in schematic, BOM and board.
• Panel project removed. Production sets come from OpenFC.kicad_pcb directly.

Open items

See hardware/docs/REV3_CHANGELIST.md. None are blocking: J45/J46 not placed, D9 brightness at 6.49k, input caps at 50 V, inductor saturation headroom, and the VBAT divider.