# CJ7905

**Changjing** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-252-2L

CJ7905 from Changjing, in a TO-252-2L. 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 | GND | power_in | Ground / common reference pin. Also thermally and electrically bonded to the exposed tab of the TO-252-2L package. |
| 2 | IN | power_in | Unregulated negative input voltage. Recommended operating range -7 V to -25 V (absolute max -35 V). A 2.2 uF input capacitor (Ci) to GND is recommended for stability. |
| 3 | OUT | power_out | Regulated -5 V output (typ; -4.8 V to -5.2 V at 25 C). Delivers up to 1.5 A peak (typ peak current 2.1 A) with a 1 uF output capacitor (Co) to GND for stability. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | TO-252-2L |
| Category | PMIC |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `CJ7905`
- Footprint: `Package_TO_SOT_SMD:TO-252-2`
- 3D model: TO-252-2L (KiCad packages3D, STEP)
- 3D model files: `cj7905-etched.step` / `cj7905-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cj7905.step` / `cj7905.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](docs/cj7905-datasheet.pdf) (3 pp, sha256 `ee3cb70df3f20dbe`, retrieved 2026-08-17, tier: lcsc)
- **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/cj7905-datasheet.pdf)