# FR9811S6

**Fitipower Integrated Tech** · DC-DC Converters · SOT23-6

FR9811S6 from Fitipower Integrated Tech, in a SOT23-6. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | BST | passive | High-side gate drive boost pin; a capacitor rated between 0.1uF and 1uF must be connected from this pin to LX to fully turn on the internal high-side NMOS. |
| 2 | GND | power_in | Ground pin. |
| 3 | FB | input | Voltage feedback input; connect FB and VOUT through a resistive divider, and the IC regulates FB at 0.6V (VFB 0.591V to 0.609V, 4.5V to 21V VIN). |
| 4 | SHDN | input | Enable input: pull high to turn the IC on and low to turn it off (EN low threshold 0.5V, high threshold 1.5V); connect to VIN through a 100kΩ resistor for self-startup. |
| 5 | VIN | power_in | Power supply input, specified at 4.5V to 21V (absolute maximum -0.3V to +22V); place input capacitors as close as possible between VIN and GND. |
| 6 | LX | output | Power switching node; connect the external inductor to this pin (absolute maximum -0.3V to VIN +0.3V). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Fitipower Integrated Tech |
| Package | SOT23-6 |
| Category | Power Management (PMIC) |
| Pins | 6 |

## CAD (KiCad official)

- Symbol: `FR9811S6`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT23-6 (KiCad packages3D, STEP)
- 3D model files: `fr9811s6-etched.step` / `fr9811s6-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `fr9811s6.step` / `fr9811s6.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Fitipower Integrated Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590905744529174528) (9 pp, sha256 `a18864a82003c220`, retrieved 2026-10-09, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/fr9811s6-datasheet.pdf)