# FR8205S6CTR

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

FR8205S6CTR 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 | BST | passive | High-side gate drive boost pin: a capacitor rated 10nF to 100nF must be connected from this pin to LX to fully turn on the internal high-side NMOS, and BST voltage is limited to -0.3V to VLX+6.5V. |
| 2 | GND | power_in | Ground pin for the device. |
| 3 | FB | input | Voltage feedback input connected to VOUT through a resistive divider; the IC regulates FB at 0.6V (VFB 0.588V to 0.612V over 4.5V to 18V VIN). |
| 4 | SHDN | input | Enable input: pull high (above 2V) to turn the IC on and low (below 0.4V) to turn it off, with a 100kΩ resistor from VIN for self-startup; the enable voltage is limited to -0.3V to +20V. |
| 5 | VIN | power_in | Power supply input for 4.5V to 18V operation (absolute maximum +20V), with input capacitors placed as close as possible between VIN and GND. |
| 6 | LX | output | Power switching node that connects to the external inductor; LX is rated -0.3V to VIN+0.3V (dynamic -5V to VIN+5V for 15ns). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Fitipower Integrated Tech |
| Package | SOT-23-6 |
| Category | Power Management (PMIC) |
| 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 | 0.588 | 0.6 | 0.612 | V | 4.5V≦VIN≦18V | 5 |
| VIN Quiescent Current | IDDQ |  |  | 1 | mA | H =2V, VFB=1.0V | 5 |
| VIN Shutdown Supply Current | ISD |  | 1 | 3 | μA | H =0V | 5 |
| High-Side MOSFET RDS(ON) | RDS(ON) |  | 90 |  | mΩ | Note 3 | 5 |
| Low-Side MOSFET RDS(ON) | RDS(ON) |  | 50 |  | mΩ | Note 3 | 5 |
| High-Side MOSFET Leakage Current | ILX(leak) |  |  | 10 | μA | H =0V, VLX=0V | 5 |
| High-Side MOSFET Current Limit | ILIMIT(HS) | 3.5 | 4.5 | 6 | A | Minimum Duty; Note 3 | 5 |
| Oscillation Frequency | FOSC | 400 | 500 | 600 | kHz |  | 5 |
| Short Circuit Oscillation Frequency | FOSC(short) |  | 150 |  | kHz | VFB=0V | 5 |
| Maximum Duty Cycle | DMAX |  | 88 |  | % | VFB=0.5V | 5 |
| Minimum On Time | TMIN |  |  | 100 | ns | Note 3 | 5 |
| Input Supply Voltage UVLO Threshold | VUVLO(Vth) |  | 4.3 |  | V | VIN Rising | 5 |
| Input Supply Voltage UVLO Threshold Hysteresis | VUVLO(HYS) |  | 400 |  | mV |  | 5 |
| Internal Soft-Start Period | TSS |  | 2 |  | ms |  | 5 |
| H Input Low Voltage |  |  |  | 0.4 | V |  | 5 |
| H Input High Voltage |  | 2 |  |  | V |  | 5 |
| H Input Current |  |  |  | 2 | μA | H =2V | 5 |
| Thermal Shutdown Threshold | TSD |  | 165 |  | °C | Note 3 | 5 |
| Supply Voltage VIN | VIN | -0.3 |  | 20 | V |  | 4 |
| Enable Voltage H |  | -0.3 |  | 20 | V |  | 4 |
| LX Voltage | VLX | -0.3 |  |  | V | Maximum printed as VIN+0.3V | 4 |
| Dynamic LX Voltage |  | -5 |  |  | V | 15ns duration; maximum printed as VIN+5V | 4 |
| BST Pin Voltage | VBST | -0.3 |  |  | V | Maximum printed as 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 (Soldering) |  |  |  | 260 | °C | 10 sec | 4 |
| Package Thermal Resistance, junction-to-ambient | θJA |  |  | 85 | °C/W | FC-SOT-23-6; Note 2: TA=25°C, 4-layer JEDEC-51-7 PCB | 4 |
| Package Thermal Resistance, junction-to-case | θJC |  |  | 20 | °C/W | FC-SOT-23-6 | 4 |
| Supply Voltage VIN | VIN | 4.5 |  | 18 | V |  | 4 |
| Operation Temperature Range |  | -40 |  | 85 | °C |  | 4 |

## CAD (KiCad official)

- Symbol: `FR8205S6CTR`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files: `fr8205s6ctr-etched.step` / `fr8205s6ctr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `fr8205s6ctr.step` / `fr8205s6ctr.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/8586204127927390208) (13 pp, sha256 `23266dab21957975`, 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/fr8205s6ctr-datasheet.pdf)