# FR9205FS6

**Fitipower Integrated Tech** · DC-DC Converters · SOT-23-6

FR9205FS6 from Fitipower Integrated Tech, in a SOT-23-6. 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 | GND | power_in | Ground pin. |
| 2 | LX | passive | Power switching node; connect an external inductor to this switching node (abs max -0.3V to VIN+0.3V). |
| 3 | VIN | power_in | Power supply input pin (4.5V to 18V operating); place input capacitors as close as possible from VIN to GND to avoid noise influence. |
| 4 | FB | input | Voltage feedback input; connect FB and VOUT with a resistive voltage divider, the IC regulates FB at 0.765V. |
| 5 | SHDN | input | Enable input pin; pull high to turn on IC and low to turn off IC (low <0.5V, high >1.5V), connect to VIN with a 100kΩ resistor for self-startup. |
| 6 | BST | passive | High side gate drive boost pin; a 0.1uF~1uF capacitor must be connected from this pin to LX to fully turn on the internal high side NMOS. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Fitipower Integrated Tech |
| Package | SOT-23-6 |
| Category | Power Supply Chip |
| Pins | 6 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Feedback Voltage | VFB | 0.753 | 0.765 | 0.776 | V | 4.5V≦VIN≦17V | 5 |
| VIN Shutdown Supply Current | ISD |  | 1 | 10 | μA | EN=0V | 5 |
| Feedback Input Current | IFB |  | 0.01 | 0.1 | μA | VFB=1V | 5 |
| VIN Quiescent Current | IDDQ |  | 0.3 |  | mA | EN=2V, VFB=1V | 5 |
| High-Side MOSFET RDS(ON) | RDS(ON) |  | 145 |  | mΩ |  | 5 |
| Low-Side MOSFET RDS(ON) | RDS(ON) |  | 90 |  | mΩ |  | 5 |
| Valley Current Limit | ILIMIT |  | 3 |  | A | Note 3: not production tested | 5 |
| On Time | TON |  | 130 |  | ns | VIN=12V, VOUT=1.05V | 5 |
| Minimum Off Time | TOFF(MIN) |  | 200 |  | ns | VFB=0.4V | 5 |
| Input Supply Voltage UVLO Threshold | VUVLO(Vth) |  | 4 |  | V | VIN Rising | 5 |
| UVLO Threshold Hysteresis | VUVLO(HYS) |  | 0.35 |  | V |  | 5 |
| Internal Soft-Start Period | TSS |  | 1.5 |  | ms | Note 3: not production tested | 5 |
| EN Input Low Voltage | VEN(L) |  |  | 0.5 | V |  | 5 |
| EN Input High Voltage | VEN(H) | 1.5 |  |  | V |  | 5 |
| EN Input Current | IEN |  | 2 |  | μA | EN=2V | 5 |
| Thermal Shutdown Threshold | TSD |  | 160 |  | °C | Note 3: not production tested | 5 |
| Thermal Shutdown Hysteresis | THYS |  | 30 |  | °C | Note 3: not production tested | 5 |
| Supply Voltage | VIN | -0.3 |  | 20 | V |  | 4 |
| Enable Voltage | VEN | -0.3 |  | 20 | V |  | 4 |
| LX Voltage | VLX | -0.3 |  |  | V | max is VIN +0.3V | 4 |
| Dynamic LX Voltage |  | -5 |  |  | V | 15ns duration; max is VIN +5V | 4 |
| BST Pin Voltage | VBST | -0.3 |  |  | V | max is VLX +6.5V | 4 |
| All Other Pins Voltage |  | -0.3 |  | 6 | V |  | 4 |
| Maximum Junction Temperature | TJ |  |  | 150 | °C |  | 4 |
| Storage Temperature | TS | -65 |  | 150 | °C |  | 4 |
| Lead Temperature |  |  |  | 260 | °C | Soldering, 10sec | 4 |
| Supply Voltage | VIN | 4.5 |  | 18 | V |  | 4 |
| Operation Temperature Range |  | -40 |  | 85 | °C |  | 4 |
| Package Thermal Resistance | θJA |  | 250 |  | °C/W | SOT-23-6 | 4 |
| Package Thermal Resistance | θJC |  | 110 |  | °C/W | SOT-23-6 | 4 |

## CAD (KiCad official)

- Symbol: `FR9205FS6`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files: `fr9205fs6-etched.step` / `fr9205fs6-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `fr9205fs6.step` / `fr9205fs6.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Fitipower Integrated Tech datasheet](docs/fr9205fs6-datasheet.pdf) (12 pp, sha256 `ee0d0f1a82c69413`, retrieved 2026-10-23, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/fr9205fs6-datasheet.pdf)