# CJ7815

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

CJ7815 from Changjing, in a TO-252-2(DPAK). 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 | IN | power_in | Unregulated input voltage, with an absolute maximum Vi of 35 V and regulation specified for 17.5 V to 30 V input, with bypass capacitor Ci 0.33 µF to be located as close to the regulator as possible. |
| 2 | GND | power_in | Ground reference pin shared by the input and output bypass capacitors (Ci 0.33 µF, Co 0.1 µF) in the typical application circuit. |
| 3 | OUT | power_out | Regulated 15 V output (Vo 14.25 V to 15.75 V over 17.5 V to 30 V input and 5 mA to 1 A load), with output bypass capacitor Co 0.1 µF recommended for stability and transient response. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | TO-252-2(DPAK) |
| 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 |
|---|---|---|---|---|---|---|---|
| Output voltage | VO | 14.4 | 15 | 15.6 | V | TJ=25℃ | 1 |
| Output voltage | VO | 14.25 | 15 | 15.75 | V | 17.5V≤Vi≤30V, Io=5mA-1A, P≤15W | 1 |
| Load Regulation | ∆Vo |  | 12 | 300 | mV | TJ=25℃, Io=5mA-1.5A | 1 |
| Load Regulation | ∆Vo |  | 3 | 150 | mV | TJ=25℃, Io=250mA-750mA | 1 |
| Line regulation | ∆Vo |  | 12 | 300 | mV | 17.5V≤Vi≤30V, TJ=25℃ | 1 |
| Line regulation | ∆Vo |  | 4 | 150 | mV | 20V≤Vi≤26V, TJ=25℃ | 1 |
| Quiescent Current | Iq |  | 4.3 | 8 | mA | TJ=25℃ | 1 |
| Quiescent Current Change | ∆Iq |  |  | 1 | mA | 17.5V≤Vi≤30V | 1 |
| Quiescent Current Change | ∆Iq |  |  | 0.5 | mA | 5mA≤IO≤1A | 1 |
| Output voltage drift | △Vo/△T |  | -1 |  | mV/℃ | IO=5mA | 1 |
| Output Noise Voltage | VN |  | 90 |  | μV | 10Hz≤f≤100KHz | 1 |
| Ripple Rejection | RR | 54 | 70 |  | dB | 18.5V≤Vi≤28.5V, f=120Hz, TJ=25℃ | 1 |
| Dropout Voltage | Vd |  | 2 |  | V | TJ=25℃, Io=1A | 1 |
| Output resistance | RO |  | 19 |  | mΩ | f=1KHZ | 1 |
| Short Circuit Current | Isc |  | 230 |  | mA | TJ=25℃ | 1 |
| Peak Current | Ipk |  | 2.1 |  | A | TJ=25℃ | 1 |
| Input Voltage | Vi |  |  | 35 | V |  | 1 |
| Thermal Resistance from Junction to Ambient | RθJA |  | 80 |  | ℃/W |  | 1 |
| Operating Junction Temperature Range | TOPR | -25 |  | 125 | ℃ |  | 1 |
| Storage Temperature Range | TSTG | -65 |  | 150 | ℃ |  | 1 |
| Continuous total dissipation | PD |  |  | 1.25 | W |  | 1 |

## CAD (KiCad official)

- Symbol: `CJ7815`
- Footprint: `Package_TO_SOT_SMD:TO-252-2`
- 3D model: TO-252-2(DPAK) (KiCad packages3D, STEP)
- 3D model files: `cj7815-etched.step` / `cj7815-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cj7815.step` / `cj7815.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586203525152190464) (4 pp, sha256 `2de73eab9c17a8cf`, retrieved 2026-10-19, tier: lcsc)
- **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/cj7815-datasheet.pdf)