# CM18450B

**iCM(创芯微)** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-3

CM18450B from iCM(创芯微), in a SOT-23-3. 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 reference pin; the datasheet rates VIN-to-ground at -0.3 V to 40 V and VOUT-to-ground at -0.3 V to 6 V. |
| 2 | VOUT | power_out | Regulated 1.8 V to 5.0 V output, rated 100 mA maximum, with VOUT-to-ground at -0.3 V to 6 V and VOUT-to-VIN at -40 V to 0.3 V. |
| 3 | VIN | power_in | Input supply pin, rated up to 40 V with VIN-to-ground at -0.3 V to 40 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | iCM(创芯微) |
| Package | SOT-23-3 |
| 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 |
|---|---|---|---|---|---|---|---|
| 输入电压 (Input voltage) | VIN |  |  | 40 | V |  | 5 |
| 静态电流 (Quiescent current) | IGND |  | 1 | 3 | µA | VIN=12V, no load | 5 |
| 输出电压精度 (Output voltage tolerance) | VOUT | -1 |  | 1 | % | VIN=12V, IOUT=10mA | 5 |
| 输出电流 (Output current) | IOUT_MAX |  |  | 100 | mA |  | 5 |
| 输入输出压差 (Dropout voltage) | VDROP |  |  | 0.12 | V | IOUT=10mA, ΔVOUT=-VOUTNOM*2% | 5 |
| 输入输出压差 (Dropout voltage) | VDROP |  |  | 0.6 | V | IOUT=50mA, ΔVOUT=-VOUTNOM*2% | 5 |
| 输入输出压差 (Dropout voltage) | VDROP |  |  | 1.2 | V | IOUT=100mA, ΔVOUT=-VOUTNOM*2% | 5 |
| 负载调整率 (Load regulation) | ΔVOUT |  | 30 | 60 | mV | 1mA≤IOUT≤100mA | 5 |
| 线性调整率 (Line regulation) | ΔVOUT*100/ΔVIN*VOUT |  |  | 0.1 | %/V | IOUT=1mA, VIN=(VOUTNOM+1V) to 40V | 5 |
| 电源抑制比 (Power supply rejection ratio) | PSRR | 40 |  |  | dB | IOUT=10mA, f=1KHz | 5 |
| 温度系数 (Temperature coefficient) | ΔVOUT/ΔTA*VOUT |  |  | 80 | ppm/℃ | IOUT=1mA, -40℃<TA<85℃ | 5 |
| 短路电流 (Short-circuit current) | ISHORT |  |  | 110 | mA | VIN=(VOUTNOM+1V) to 40V, RLOAD=VOUTNOM/1A | 5 |
| 温度保护 (Thermal shutdown temperature) | TSHDN |  |  | 150 | ℃ |  | 5 |
| VIN到地耐压 (VIN to GND voltage) | VIN | -0.3 |  | 40 | V | VIN to GND | 3 |
| VOUT到地耐压 (VOUT to GND voltage) | VOUT | -0.3 |  | 6 | V | VOUT to GND | 3 |
| VOUT到VIN耐压 (VOUT to VIN voltage) |  | -40 |  | 0.3 | V | VOUT to VIN | 3 |
| 工作环境温度 (Operating ambient temperature) |  | -40 |  | 85 | ℃ |  | 3 |
| 存储温度 (Storage temperature) |  | -40 |  | 150 | ℃ |  | 3 |
| 工作结温 (Operating junction temperature) |  |  |  | 150 | ℃ |  | 3 |
| 热阻 SOT23-3 (Thermal resistance, SOT23-3) |  |  |  | 380 | ℃/W | SOT23-3 package | 3 |
| 输入电容 Cin (Input capacitor) | Cin | 1 | 10 | 22 | µF |  | 2 |
| 输出电容 Cout (Output capacitor) | Cout | 4.7 | 10 | 22 | µF |  | 2 |

## CAD (KiCad official)

- Symbol: `CM18450B`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files: `cm18450b-etched.step` / `cm18450b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cm18450b.step` / `cm18450b.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [iCM(创芯微) datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603386753382297600) (8 pp, sha256 `6178862cae1ab377`, 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/cm18450b-datasheet.pdf)