# SY8253ADC

**Silergy Corp** · DC-DC Converters · SOT-23-6

SY8253ADC from Silergy Corp, in a SOT-23-6. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | BS | passive | Boot-strap pin. Supplies the high-side gate driver. Decouple this pin to LX with a 0.1uF ceramic capacitor. |
| 2 | GND | power_in | Ground pin. Common return for power and signal. |
| 3 | FB | input | Output feedback pin. Connect to the center of the output resistor divider to program the output voltage: Vout = 0.6V × (1 + R1/R2). Internal reference 0.6V ±1.5%. |
| 4 | EN | input | Enable control input. Pull high (>1.5V rising threshold) to turn the regulator on; below 0.4V it is off. Do not float. |
| 5 | IN | power_in | Input supply pin, 4.5V to 23V. Decouple to GND with at least a 1uF ceramic capacitor placed close to the pin. |
| 6 | LX | power_out | Switching node. Connect to the external inductor. Internal top/bottom FETs switch this node at 500 kHz with 3A output capability. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Silergy Corp |
| Package | SOT-23-6 |
| Category | PMIC |
| Pins | 6 |

## Ordering variants

Same part, different packaging or reel option.

- `SY8253ADC`
- `SY8253ADCAIC`

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Input Voltage Range | VIN | 4.5 |  | 23 | V |  | 4 |
| Shutdown Current | ISHDN |  | 5 | 10 | µA | EN=0 | 4 |
| Feedback Reference Voltage | VREF | 0.591 | 0.6 | 0.609 | V |  | 4 |
| FB Input Current | IFB | -50 |  | 50 | nA | VFB=3.3V | 4 |
| Top FET Peak Current Limit | ILIM,TOP | 5.1 | 6 | 6.9 | A |  | 4 |
| Bottom FET Valley Current Limit | ILIM,BOT | 3 | 3.7 | 4.5 | A |  | 4 |
| Power Dissipation | PD |  |  | 1.5 | W | TA = 25°C, TSOT23-8 /TSOT23-6 | 3 |
| Junction Temperature Range (absolute maximum) |  |  |  | 150 | °C |  | 3 |
| Lead Temperature (Soldering) |  |  |  | 260 | °C | Soldering, 10 sec. | 3 |
| Storage Temperature Range |  | -65 |  | 150 | °C |  | 3 |
| Supply Input Voltage (recommended) |  | 4.5 |  | 23 | V |  | 3 |
| Junction Temperature Range (recommended) |  | -40 |  | 125 | °C |  | 3 |
| Ambient Temperature Range (recommended) |  | -40 |  | 85 | °C |  | 3 |
| Quiescent Current | IQ |  | 100 |  | µA | IOUT=0, VFB=VREF*105% | 4 |
| Top FET RON | RDS(ON)1 |  | 105 |  | mΩ |  | 4 |
| Bottom FET RON | RDS(ON)2 |  | 50 |  | mΩ |  | 4 |
| EN Rising Threshold | VENH |  | 1.5 |  | V |  | 4 |
| EN Falling Threshold | VENL |  | 0.4 |  | V |  | 4 |
| Output OVP Response Time | TOVP |  | 10 |  | µs |  | 4 |
| Output OVP Off Time | tOFF,OVP |  | 1000 |  | µs |  | 4 |
| Soft-start Charging Current | ISS |  | 4 |  | µA |  | 4 |
| Short Circuit Protection Wait Time | tWAIT,SCP |  | 1.9 |  | ms |  | 4 |
| Short Circuit Protection Off Time | tOFF,SCP |  | 15 |  | ms |  | 4 |
| Input UVLO Threshold | VUVLO |  | 4.5 |  | V |  | 4 |
| Input UVLO Hysteresis | VHYS |  | 0.3 |  | V |  | 4 |
| Min ON Time |  |  | 80 |  | ns |  | 4 |
| Min OFF Time |  |  | 160 |  | ns |  | 4 |
| Thermal Shutdown Temperature | TSD |  | 150 |  | ℃ |  | 4 |
| Thermal Shutdown Hysteresis | THYS |  | 15 |  | ℃ |  | 4 |
| Package Thermal Resistance, junction-to-ambient | θJA |  | 66 |  | °C/W | Natural convection at TA = 25°C on two-layer Silergy Evaluation Board (Note 2) | 3 |
| Package Thermal Resistance, junction-to-case | θJC |  | 15 |  | °C/W |  | 3 |

## CAD (KiCad official)

- Symbol: `SY8253ADC`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files: `sy8253adc-etched.step` / `sy8253adc-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sy8253adc.step` / `sy8253adc.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Silergy Corp datasheet](docs/sy8253adc-datasheet.pdf) (13 pp, sha256 `a5a2858a74928804`, retrieved 2026-08-17, tier: manufacturer)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/sy8253adc-datasheet.pdf)