# CM1802B28

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

CM1802B28 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 for the regulator; the datasheet gives no separate electrical limit for this pin beyond the absolute maximum ratings. |
| 2 | VOUT | power_out | Regulated 2.8 V output (±2% accuracy) that delivers up to 500 mA, with VOUT to GND absolute maximum of -0.3 to 5 V. |
| 3 | VIN | power_in | Input supply pin with an operating range of 1.8 V to 6.5 V, and an absolute maximum of -0.3 to 6.5 V to GND. |

## 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 |
|---|---|---|---|---|---|---|---|
| Input voltage VIN | VIN | 1.8 |  | 6.5 | V |  | 6 |
| Output voltage accuracy (VOUT, 2.8V option) | VOUT | -2 |  | 2 | % | VIN=5.5V, IOUT=10mA | 6 |
| Absolute max VIN to GND | VIN | -0.3 |  | 6.5 | V |  | 5 |
| Absolute max VOUT to GND | VOUT | -0.3 |  | 5 | V |  | 5 |
| Absolute max VIN to VOUT |  | 0.3 |  | 5 | V |  | 5 |
| Operating ambient temperature |  | -40 |  | 85 | ℃ |  | 5 |
| Storage temperature |  | -40 |  | 150 | ℃ |  | 5 |
| Operating junction temperature |  |  |  | 150 | ℃ |  | 5 |
| ESD HBM |  |  |  | 2 | kV | Human body model | 5 |
| Thermal resistance junction-to-ambient, SOT23-3 |  |  | 380 |  | ℃/W | SOT23-3 package | 5 |
| Output voltage (selection table) | VOUT |  | 2.8 |  | V | CM1802X28 fixed output option | 1 |
| Quiescent current IGND | IGND |  | 40 |  | µA | VIN=5.5V, no load | 6 |
| Output current IOUT_MAX | IOUT_MAX |  | 500 |  | mA |  | 6 |
| Dropout voltage VDROP (10mA) | VDROP |  | 20 |  | mV | IOUT=10mA, ΔVOUT=-0.1V | 6 |
| Dropout voltage VDROP (100mA) | VDROP |  | 110 |  | mV | IOUT=100mA, ΔVOUT=-0.1 | 6 |
| Load regulation ΔVOUT | ΔVOUT |  | 0.2 |  | % | 1mA≤IOUT≤300mA | 6 |
| Line regulation ΔVOUT/ΔVIN | ΔVOUT/ΔVIN |  | 0.1 |  | mV/V | IOUT=1mA, VIN=(VOUTNOM+1V) to 6V | 6 |
| Current limit ILIMIT | ILIMIT |  | 500 |  | mA |  | 6 |
| Power supply rejection ratio PSRR | PSRR |  | 65 |  | dB | f=10kHz, COUT=1uF, IOUT=30mA | 6 |
| Over-temperature protection TSHDN | TSHDN |  | 155 |  | ℃ |  | 6 |
| Over-temperature recovery TSHDNR | TSHDNR |  | 135 |  | ℃ |  | 6 |

## CAD (KiCad official)

- Symbol: `CM1802B28`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files: `cm1802b28-etched.step` / `cm1802b28-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cm1802b28.step` / `cm1802b28.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/8603386739989884928) (17 pp, sha256 `f0186af81e472d6d`, 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/cm1802b28-datasheet.pdf)