component
FR9863FS9
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FITIPOWER(天钰) DC-DC Converters, TSOT-23-6. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
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PCB Footprint
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Datasheet
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README
markdownFR9863FS9
FITIPOWER(天钰) · DC-DC Converters · TSOT-23-6
FR9863FS9 from FITIPOWER(天钰), in a TSOT-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 of the device. |
| 2 | LX | passive | Power switching node to which the external inductor connects; LX voltage is limited to -0.3V to (VIN+0.3V), with dynamic excursions of -5V to VIN+5V for up to 15ns. |
| 3 | VIN | power_in | Power supply input, operating from 4.5V to 28V, with input capacitors to be placed as close as possible between VIN and GND; absolute maximum is -0.3V to +30V. |
| 4 | FB | input | Voltage feedback input connected to VOUT through a resistive divider, regulated at 0.596V (typ). |
| 5 | SHDN | input | Enable input: pull high to turn the IC on and low to turn it off (high threshold 1.6V min, low threshold 0.8V max), and connect to VIN through a 100kΩ resistor for self-startup. |
| 6 | BST | passive | High-side gate drive boost pin; a capacitor rated 0.1uF to 1uF must be connected from BST to LX, and BST voltage is limited to -0.3V to VLX+6.5V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | FITIPOWER(天钰) |
| Package | TSOT-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 | 0.581 | 0.596 | 0.611 | V | 4.5V≦VIN≦28V | 5 |
| VIN Quiescent Current | IDDQ | 150 | μA | H =2V, VFB=1V | 5 | ||
| VIN Shutdown Supply Current | ISD | 3 | μA | H =0V | 5 | ||
| Feedback Input Current | IFB | 0.01 | 0.1 | μA | VFB=1V | 5 | |
| High-Side MOSFET RDS(ON) | RDS(ON) | 80 | mΩ | 5 | |||
| Low-Side MOSFET RDS(ON) | RDS(ON) | 40 | mΩ | 5 | |||
| Valley Current Limit (Note 3) | ILIMIT | 4.2 | 5.5 | 7.1 | A | 5 | |
| On Time | TON | 200 | ns | VIN=12V, VOUT=1.05V | 5 | ||
| Minimum Off Time | TOFF(MIN) | 260 | ns | VFB=0.4V | 5 | ||
| Input Supply Voltage UVLO Threshold | VUVLO(Vth) | 4.1 | V | VIN Rising | 5 | ||
| UVLO Threshold Hysteresis | VUVLO(HYS) | 0.5 | V | 5 | |||
| Internal Soft-Start Period (Note 3) | TSS | 1 | ms | 5 | |||
| H Input Low Voltage | 0.8 | V | 5 | ||||
| H Input High Voltage | 1.6 | V | 5 | ||||
| H Input Current | 2 | μA | H =2V | 5 | |||
| Thermal Shutdown Threshold (Note 3) | TSD | 160 | °C | 5 | |||
| Thermal Shutdown Hysteresis (Note 3) | THYS | 30 | °C | 5 | |||
| Supply Voltage VIN (absolute maximum) | VIN | -0.3 | 30 | V | 4 | ||
| Enable Voltage H (absolute maximum) | -0.3 | 30 | V | 4 | |||
| LX Voltage | VLX | -0.3 | V | maximum printed as (VIN +0.3V) | 4 | ||
| Dynamic LX Voltage in 15ns Duration | -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 soldering | 4 | |||
| Supply Voltage VIN (recommended) | VIN | 4.5 | 28 | V | 4 | ||
| Operating Ambient Temperature Range | -40 | 85 | °C | 4 | |||
| Operating Junction Temperature Range | -40 | 125 | °C | 4 | |||
| Package Thermal Resistance (θJA) | θJA | 85 | °C/W | TSOT-23-6; measured at 25°C ambient, JEDEC-51-7 4-layer board (Note 2) | 4 | ||
| Package Thermal Resistance (θJC) | θJC | 20 | °C/W | TSOT-23-6 | 4 |
CAD (KiCad official)
- Symbol:
FR9863FS9 - Footprint:
Package_TO_SOT_SMD:TSOT-23-6 - 3D model: TSOT-23-6 (KiCad packages3D, STEP)
- 3D model files:
fr9863fs9-etched.step/fr9863fs9-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);fr9863fs9.step/fr9863fs9.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: FITIPOWER(天钰) datasheet (13 pp, sha256
050262b1bee323ca, retrieved 2026-10-18, 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).