# SY50583FAC

**Silergy Corp** · AC-DC Controllers And Regulators · SOP-8

SY50583FAC from Silergy Corp, in a SOP-8. 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 for the controller and the reference for the VIN bypass capacitor, which should be connected to the bias capacitor rather than to this pin. |
| 2 | ISET | input | Current set pin: connect a resistor to program the output limit current, with the internal current reference VREF specified at 620 mV to 710 mV (675 mV typical). |
| 3 | VIN | power_in | Power supply pin with a recommended operating range of 9 V to 16 V, a turn-on threshold of 13.5 V to 16 V and a turn-off threshold of 6.3 V to 7.8 V, with absolute maximum rating of -0.3 V to 17 V. |
| 4 | VSEN | input | Voltage sense pin connected to a resistor divider from the inductor or auxiliary winding to sense output voltage, with internal reference VVSEN_REF of 1.215 V to 1.285 V (1.25 V typical) and an over-voltage threshold of 1.03 times VVSEN_REF. |
| 5 | LX | output | Internal high-voltage MOSFET drain pin, with a MOSFET breakdown voltage of 700 V minimum and an absolute maximum LX current of 1.4 A. |
| 6 | LX | output | Internal high-voltage MOSFET drain pin, with a MOSFET breakdown voltage of 700 V minimum and an absolute maximum LX current of 1.4 A. |
| 7 | LX | output | Internal high-voltage MOSFET drain pin, with a MOSFET breakdown voltage of 700 V minimum and an absolute maximum LX current of 1.4 A. |
| 8 | LX | output | Internal high-voltage MOSFET drain pin, with a MOSFET breakdown voltage of 700 V minimum and an absolute maximum LX current of 1.4 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Silergy Corp |
| Package | SOP-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| VIN supply voltage | VIN | 9 |  | 16 | V |  | 3 |
| Junction temperature range |  | -40 |  | 125 | °C |  | 3 |
| ISET pin voltage |  | -0.3 |  | 3.6 | V |  | 3 |
| VIN, VSEN pin voltage |  | -0.3 |  | 17 | V |  | 3 |
| VIN input current | IVIN |  |  | 10 | mA |  | 3 |
| LX drain current | ILX |  |  | 1.4 | A |  | 3 |
| LX pin voltage |  |  |  | 700 | V |  | 3 |
| Power dissipation SO8 |  |  |  | 1.1 | W | @ TA = 25°C | 3 |
| Junction temperature range |  | -45 |  | 150 | °C |  | 3 |
| Lead temperature (soldering) |  |  |  | 260 | °C | Soldering, 10 sec. | 3 |
| Storage temperature range |  | -65 |  | 150 | °C |  | 3 |
| Package thermal resistance junction-to-ambient SO8 | θJA |  | 125 |  | °C/W | Note 2 | 3 |
| Package thermal resistance junction-to-case SO8 | θJC |  | 60 |  | °C/W |  | 3 |
| VIN turn-on threshold | VVIN_ON | 13.5 | 14.6 | 16 | V | VVIN = 12V (Note 3), TA = 25°C unless otherwise specified | 4 |
| VIN turn-off threshold | VVIN_OFF | 6.3 | 7 | 7.8 | V | VVIN = 12V (Note 3), TA = 25°C unless otherwise specified | 4 |
| Start up current | IST |  | 15 | 18 | µA | VVIN = 12V (Note 3), TA = 25°C unless otherwise specified | 4 |
| VSEN pin reference voltage | VVSEN_REF | 1.215 | 1.25 | 1.285 | V | VVIN = 12V (Note 3), TA = 25°C unless otherwise specified | 4 |
| Min ON time | TON_MIN | 300 |  |  | ns | VVIN = 12V (Note 3), TA = 25°C unless otherwise specified | 4 |
| Max ON time | TON_MAX |  |  | 25 | µs | VVIN = 12V (Note 3), TA = 25°C unless otherwise specified | 4 |
| Min OFF time | TOFF_MIN | 1.8 |  |  | µs | VVIN = 12V (Note 3), TA = 25°C unless otherwise specified | 4 |
| Max OFF time | TOFF_MAX |  |  | 150 | µs | VVIN = 12V (Note 3), TA = 25°C unless otherwise specified | 4 |
| Minimum switching period | TPERIOD_MIN | 22 |  |  | µs | VVIN = 12V (Note 3), TA = 25°C unless otherwise specified | 4 |
| Current reference | VREF | 620 | 675 | 710 | mV | VVIN = 12V (Note 3), TA = 25°C unless otherwise specified | 4 |
| BV of HV MOSFET | VBV | 700 |  |  | V | VGS=0V, IDS=250µA | 4 |
| Static drain-source on-resistance | RDSON |  | 7 | 8.5 | Ω | VGS=12V, IDS=0.1A | 4 |
| Thermal shutdown temperature | TSD |  | 150 |  | C |  | 4 |

## CAD (KiCad official)

- Symbol: `SY50583FAC`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `sy50583fac-etched.step` / `sy50583fac-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sy50583fac.step` / `sy50583fac.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Silergy Corp datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590917253573656576) (12 pp, sha256 `01b05ad3ebe76ea9`, retrieved 2026-10-18, 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/sy50583fac-datasheet.pdf)