component
FR9850S6
Public Made by Adomby adom
Fitipower Integrated Tech DC-DC Converters, SOT-23-6. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownFR9850S6
Fitipower Integrated Tech · DC-DC Converters · SOT-23-6
FR9850S6 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, with a capacitor rated 0.1uF to 1uF connected from this pin to LX to fully turn on the internal high-side NMOS. |
| 2 | GND | power_in | Ground pin; the input capacitors should be placed as close as possible between VIN and GND. |
| 3 | FB | input | Voltage feedback input connected to VOUT through a resistive divider, regulated at 0.6V (VFB 0.591V to 0.609V). |
| 4 | SHDN | input | Enable input: pull high to turn the IC on and low to turn it off (VIH 1.5V min, VIL 0.5V max), and connect to VIN through a 100kΩ resistor for self-startup. |
| 5 | VIN | power_in | Power supply input with a recommended range of 4.5V to 17V and an absolute maximum of 20V; input capacitors should be placed as close as possible to VIN and GND. |
| 6 | LX | output | Power switching node that connects to the external inductor, with a voltage limit of -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 | 0.591 | 0.6 | 0.609 | V | 4.5V≦VIN≦17V | 5 |
| Feedback Input Current | IFB | 0.01 | 0.1 | μA | VFB=1V | 5 | |
| VIN Shutdown Supply Current | ISD | 1 | 10 | μA | H =0V | 5 | |
| Supply Voltage VIN | VIN | -0.3 | 20 | V | 4 | ||
| Enable Voltage H | -0.3 | 20 | V | 4 | |||
| LX Voltage | VLX | -0.3 | V | 4 | |||
| Dynamic LX Voltage | -5 | V | 15ns duration | 4 | |||
| BST Pin Voltage | VBST | -0.3 | V | 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 | |||
| Supply Voltage VIN (recommended) | VIN | 4.5 | 17 | V | 4 | ||
| Operation Temperature Range | -40 | 85 | °C | 4 | |||
| Package Thermal Resistance, junction-to-ambient (SOT-23-6) | θJA | 250 | °C/W | Note 2: measured at 25°C ambient, JEDEC-51-7 4-layer board | 4 | ||
| Package Thermal Resistance, junction-to-case (SOT-23-6) | θJC | 110 | °C/W | 4 | |||
| VIN Quiescent Current | IDDQ | 0.3 | mA | H =2V, VFB=1V | 5 | ||
| High-Side MOSFET RDS(ON) | RDS(ON) | 150 | mΩ | 5 | |||
| Low-Side MOSFET RDS(ON) | RDS(ON) | 80 | mΩ | 5 | |||
| High-Side MOSFET Current Limit | ILIMIT(HS) | 3.2 | A | 5 | |||
| On Time | TON | 150 | ns | VIN=12V, VOUT=1.05V | 5 | ||
| Minimum Off Time | TOFF(MIN) | 180 | ns | VFB=0.4V | 5 | ||
| Input Supply Voltage UVLO Threshold | VUVLO(Vth) | 4.3 | V | VIN Rising | 5 | ||
| UVLO Threshold Hysteresis | VUVLO(HYS) | 0.35 | V | 5 | |||
| Internal Soft-Start Period | TSS | 1 | ms | 5 | |||
| H Input Low Voltage | 0.5 | V | 5 | ||||
| H Input High Voltage | 1.5 | V | 5 | ||||
| H Input Current | 2 | μA | H =2V | 5 | |||
| Thermal Shutdown Threshold | TSD | 160 | °C | 5 | |||
| Thermal Shutdown Hysteresis | THYS | 30 | °C | 5 |
CAD (KiCad official)
- Symbol:
FR9850S6 - Footprint:
Package_TO_SOT_SMD:SOT-23-6 - 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files:
fr9850s6-etched.step/fr9850s6-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);fr9850s6.step/fr9850s6.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Fitipower Integrated Tech datasheet (10 pp, sha256
9e875006971d6db7, retrieved 2026-10-19, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).