# OC7550

**OCX(欧创芯)** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT89-3

OC7550 from OCX(欧创芯), in a SOT89-3. 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, the reference for the regulator (datasheet lists it as 地, ground). |
| 2 | VCC | power_in | Supply input; the datasheet gives an input range of 3.5 V to 40 V, with an absolute maximum of 44 V from VCC to GND. |
| 3 | VOUT | output | Regulated output; absolute maximum is 7 V to GND, and at least 2.2 uF of effective output capacitance is required for stability. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | OCX(欧创芯) |
| Package | SOT89-3 |
| Category | Power Management (PMIC) |
| Pins | 3 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| 输出电压范围 | VOUT | 2.5 |  | 5.2 | V |  | 4 |
| 直流输出精度 |  | -2 |  | 2 | % | ILOAD=10mA | 4 |
| 压降电压 |  |  |  | 600 | mV | ILOAD=100mA | 4 |
| VCC 静态电流 | IQ |  | 3 | 5 | uA | ILOAD=0mA，VCC=3.5~36V，VOUT=3.3v | 4 |
| 线性调节率 |  |  | 0.02 | 0.03 | %/V | VCC=4.5~36V，ILOAD=10mA | 4 |
| 负载调节率 | ΔVOUT |  |  | 15 | mV | 0<ILOAD<50mA，VCC=VOUT+2V | 4 |
| 输出电流限制 |  |  | 206 |  | mA | VOUT=0.85*VOUT（normal） | 4 |
| 短路电流 | ISHORT |  | 85 |  | mA | VOUT短路到 GND | 4 |
| 电源抑制比 (f=100Hz) | PSRR |  | -86 |  | dB | f=100Hz，IOUT=10mA，VCC=12v | 4 |
| 电源抑制比 (f=100kHz) | PSRR |  | -47 |  | dB | f=100kHz，IOUT=10mA，VCC=12v | 4 |
| 热保护温度 |  |  | 145 |  | ℃ | ILOAD=30mA | 4 |
| 热保护温度迟滞 |  |  | 20 |  | ℃ |  | 4 |
| VCC 端到 GND 最大电压值 | VCC | -0.3 |  | 44 | V | VCC端到GND | 3 |
| VOUT 端到 GND 最大电压值 | VOUT | -0.3 |  | 7 | V | VOUT端到GND | 3 |
| VOUT 端到 VCC 端最大电压值 | VOUT-VCC | -44 |  | 0.3 | V | VOUT端到VCC端 | 3 |
| SOT89-3 封装最大功耗 | PSOT89-3 |  |  | 0.6 | W | SOT89-3封装 | 3 |
| HBM ESD | VHBM |  |  | 2000 | V | HBM | 3 |
| 工作温度范围 | TA | -40 |  | 85 | oC |  | 3 |
| 存储温度范围 | TSTG | -65 |  | 150 | oC |  | 3 |
| 焊接温度 | TSD |  |  | 260 | oC | 时间少于 10s | 3 |
| 输入电压范围 | VCC | 3.5 |  | 40 | V |  | 1 |
| 最小需要的输出有效电容 |  | 2.2 |  |  | uF |  | 5 |

## CAD (KiCad official)

- Symbol: `OC7550`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT89-3 (KiCad packages3D, STEP)
- 3D model files: `oc7550-etched.step` / `oc7550-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `oc7550.step` / `oc7550.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [OCX(欧创芯) datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603175143325773824) (7 pp, sha256 `1c9626de1cad66a6`, retrieved 2026-10-17, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/oc7550-datasheet.pdf)