# COS29502WU

**COSINE** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-263-5

COS29502WU from COSINE, in a TO-263-5. 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 | EN | input | CMOS/TTL-compatible enable input for the COS29xx2, where logic-high (≥2.4V) enables and logic-low (≤0.8V) shuts down the output, and it may be tied to VIN if ON/OFF control is not needed. |
| 2 | IN | power_in | Input supply that feeds the output power device, with a recommended range of 4.5 to 26V and an absolute maximum of 40V. |
| 3 | GND | power_in | Ground pin, which is internally connected to the thermal tab. |
| 4 | OUT | power_out | Regulated output voltage, adjustable from 1.25V to 25V, which needs an output capacitor of at least 10µF at full load for stability. |
| 5 | ADJ | input | Adjustable feedback input to the resistor divider from OUT to GND with a 1.24V typical reference, where the resistor from OUT to ADJ should not exceed 10kΩ. |
| 6 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | COSINE |
| Package | TO-263-5 |
| Category | Power Management (PMIC) |
| Pins | 6 |

## 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 | VOUT | -1 |  | 1 | % | IOUT=10mA | 4 |
| Output Voltage | VOUT | -2 |  | 2 | % | 10mA ≤ IOUT ≤ IFL, (VOUT + 1V) ≤ VIN ≤ 26V | 4 |
| Line Regulation |  |  | 0.3 | 0.6 | % | IOUT=10mA, (VOUT + 1V) ≤ VIN ≤ 26V | 4 |
| Load Regulation |  |  | 0.2 | 3 | % | 10mA≦IOUT≦1.5A | 4 |
| Output Voltage Temperature Coefficient | ΔVo/ΔT |  | 20 | 100 | ppm/°C |  | 4 |
| Dropout Voltage |  |  | 125 | 250 | mV | ΔVOUT = -1%, COS2950x, IOUT=250mA | 4 |
| Dropout Voltage |  |  | 370 | 600 | mV | ΔVOUT = -1%, COS2950x, IOUT=5A | 4 |
| Dropout Voltage |  |  | 250 |  | mV | ΔVOUT = -1%, COS2950x, IOUT=2.5A | 4 |
| Ground Current | IGND |  | 5.2 |  | mA | COS2950x, IOUT=2.5A, VIN = VOUT +1V | 4 |
| Ground Current | IGND |  | 28 |  | mA | COS2950x, IOUT=5A, VIN = VOUT +1V | 4 |
| Ground Pin Current at Dropout | IGRNDDO |  | 1.9 |  | mA | COS2950x, IOUT=10mA, VIN 0.5V less than specified VOUT | 5 |
| Current Limit | ILIM |  | 6.3 | 7.8 | A | COS2950x, VOUT=0V | 5 |
| Ground Current in Shutdown |  |  | 5 | 75 | nA |  | 5 |
| Output Noise Voltage | en |  | 390 |  | µVrms | CL=10µF, IL=100mA, 10Hz to 100kHz | 5 |
| Output Noise Voltage | en |  | 211 |  | µVrms | CL=33µF, IL=100mA, 10Hz to 100kHz | 5 |
| Reference Voltage |  | 1.22 | 1.24 | 1.252 | V |  | 5 |
| Reference Voltage Temperature Coefficient |  |  | 20 |  | ppm/°C |  | 5 |
| Adjust Pin Bias Current |  |  |  | 100 | pA |  | 5 |
| Flag Output Low Voltage | VOL |  |  | 400 | mV |  | 5 |
| Flag Hysteresis |  |  | 15 |  | mV |  | 5 |
| Input Logic Voltage Low (OFF) |  |  |  | 0.8 | V |  | 5 |
| Input Logic Voltage High (ON) |  | 2.4 |  |  | V |  | 5 |
| Enable Pin Input Current |  |  |  | 24 | pA | VEN=0.8V | 5 |
| Enable Pin Input Current |  |  |  | 3 | nA | VEN=26V | 5 |
| Regulator Output Current in Shutdown |  |  |  | 18 | µA | -40°C≤TJ≤ +125°C | 5 |
| Maximum Input Voltage | VIN | -0.3 |  | 40 | V |  | 3 |
| Enable Input Voltage |  | -0.3 |  |  | V | -0.3 to VIN | 3 |
| Storage Temperature Range |  | -55 |  | 150 | °C |  | 3 |
| Operating Junction Temperature Range |  | -40 |  | 125 | °C |  | 3 |
| ESD Susceptibility, HBM |  |  |  | 2000 | V |  | 3 |
| Package Thermal Resistance, Junction-to-case | RθJC |  | 2 |  | °C/W | TO-263 | 3 |
| Input Supply Voltage |  | 4.5 |  | 26 | V |  | 3 |
| Operating ambient temperature |  | -40 |  | 85 | °C |  | 3 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | copper |  | Internally connected directly to the device pin3 (GND). The thermal tab must be connected to a copper area on the PCB at the same | 2 |

## CAD (KiCad official)

- Symbol: `COS29502WU`
- Footprint: `Package_TO_SOT_SMD:TO-263-5_TabPin6`
- 3D model: TO-263-5 (KiCad packages3D, STEP)
- 3D model files: `cos29502wu-etched.step` / `cos29502wu-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cos29502wu.step` / `cos29502wu.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [COSINE datasheet](docs/cos29502wu-datasheet.pdf) (10 pp, sha256 `e0043457320aadcb`, retrieved 2026-10-26, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/cos29502wu-datasheet.pdf)