# LDK320AU50R

**STMicroelectronics** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89

LDK320AU50R from STMicroelectronics, in a SOT-89. 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 | OUT | power_out | Output voltage of the LDO, delivering up to 200 mA of output current. |
| 2 | GND | power_in | Common ground for the LDO. |
| 3 | IN | power_in | Input voltage of the LDO, operating from 2.5 V to 18 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SOT-89 |
| 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 accuracy, LDK320A | VOUT | -0.5 |  | 0.5 | % | TJ = 25 °C | 6 |
| Output voltage accuracy, LDK320A | VOUT | -1.5 |  | 1.5 | % | -40 °C < TJ < 125 °C | 6 |
| Operating input voltage | VIN | 2.5 |  | 18 | V |  | 6 |
| Enable input logic high | VEN | 1.2 |  |  | V | VIN = 2.5 V to 18 V, -40 °C < TJ < 125 °C | 7 |
| Enable input logic low | VEN |  |  | 0.4 | V | VIN = 2.5 V to 18 V, -40 °C < TJ < 125 °C | 7 |
| Output capacitor capacitance | COUT | 1 |  | 22 | µF | Capacitance (see Section 6 Typical characteristics) | 7 |
| Static line regulation | ΔVOUT |  | 0.001 | 0.05 | %/V | VOUT +1 V ≤ VIN ≤ 18 V | 6 |
| Static load regulation (SOT-89), VOUT > 2 V | ΔVOUT |  | 0.001 | 0.004 | %/mA | IOUT = 1 mA to 200 mA, VOUT > 2 V | 6 |
| Dropout voltage | VDROP |  | 200 | 350 | mV | IOUT = 200 mA, VOUT = 3.3 V, 40 °C < TJ < 125 °C | 6 |
| Quiescent current | IQ |  | 60 | 90 | µA | VOUT +1 V ≤ VIN ≤ 18 V, IOUT = 0 mA, -40 °C < TJ < 125 °C | 6 |
| Quiescent current | IQ |  | 70 | 100 | µA | VIN = VOUT +1 V, IOUT = 200 mA, -40 °C < TJ < 125 °C | 6 |
| VIN input current in OFF mode |  |  | 0.2 | 1 | µA | VEN = GND, TJ = 25 °C | 6 |
| Enable pin input current | IEN |  | 0.1 | 100 | nA | VEN = VIN | 7 |
| Operating input voltage (absolute maximum) | VIN | -0.3 |  | 20 | V | DC input voltage | 5 |
| DC output voltage | VOUT | -0.3 |  |  | V | upper limit VI + 0.3 V | 5 |
| Enable input voltage | VEN | -0.3 |  |  | V | upper limit VI + 0.3 V | 5 |
| Storage temperature range | TSTG | -65 |  | 150 | °C |  | 5 |
| Operating junction temperature range | TOP | -40 |  | 125 | °C |  | 5 |
| Thermal resistance junction-ambient | RthJA |  | 110 |  | °C/W | SOT-89 | 5 |
| Thermal resistance junction-case | RthJC |  | 15 |  | °C/W | SOT-89 | 5 |

## CAD (KiCad official)

- Symbol: `LDK320AU50R`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89 (KiCad packages3D, STEP)
- 3D model files: `ldk320au50r-etched.step` / `ldk320au50r-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ldk320au50r.step` / `ldk320au50r.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [STMicroelectronics datasheet](https://www.st.com/resource/en/datasheet/ldk320au50r.pdf) (32 pp, sha256 `26f60da8e9021885`, retrieved 2026-11-06, tier: manufacturer)
- **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/ldk320au50r-datasheet.pdf)