# FLD0503-3.3YDFN1X1G

**Full Way** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · DFN-4L(1x1)

FLD0503-3.3YDFN1X1G from Full Way, in a DFN-4L(1x1). 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 | VOUT | power_out | Output voltage pin supplying up to 300mA continuous (450mA peak) with ±2% output voltage accuracy over the temperature range. |
| 2 | GND | power_in | Ground reference pin for the regulator. |
| 3 | EN | input | Enable pin, with an enable high level of 0.6 V and an enable low level of 0.2 V. |
| 4 | VIN | power_in | Input voltage pin, rated for up to 6 V operation with an absolute maximum of -0.3 V to +6.5 V. |
| 5 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Full Way |
| Package | DFN-4L(1x1) |
| Category | Power Management (PMIC) |
| Pins | 5 |

## 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 | ΔVOUT | -2 |  | 2 | % |  | 3 |
| Line Regulation | ΔVLINE |  | 20 | 50 | mV | VIN = VOUT + 1V to 5.5V | 3 |
| Load Regulation | ΔVLOAD |  | 13 | 25 | mV | IOUT = 1mA to 150mA | 3 |
| Load Regulation | ΔVLOAD |  | 25 | 40 | mV | IOUT = 1mA to 300mA | 3 |
| Current Limit | ICL | 360 |  | 560 | mA |  | 3 |
| Quiescent Current | IQ |  | 0.5 | 1 | uA | TJ= 25℃ | 3 |
| Dropout Voltage | VDROP |  | 130 |  | mV | IOUT = 100mA, VOUT = 3.3V | 3 |
| Dropout Voltage | VDROP |  | 400 |  | mV | IOUT = 300mA, VOUT = 3.3V | 3 |
| Enable high level | VENHI |  | 0.6 |  | V |  | 3 |
| Enable low level | VENLO |  | 0.2 |  | V |  | 3 |
| Power-supply rejection ratio | PSRR |  | 60 |  | dB | f = 1kHz | 3 |
| Thermal Shutdown | TSD |  | 150 |  | ℃ |  | 3 |
| Thermal Shutdown Hy | TSDHY |  | 20 |  | ℃ |  | 4 |
| VIN (Input voltage) | VIN | -0.3 |  | 6.5 | V |  | 2 |
| Junction Temperature |  |  |  | 125 | ℃ |  | 2 |
| Lead Temperature (Soldering) |  |  |  | 300 | ℃ | Soldering, 10 sec. | 2 |
| Storage Temperature |  | -65 |  | 150 | ℃ |  | 2 |
| Input voltage (maximum operating voltage) | VIN |  |  | 6 | V | Stated as the maximum operating voltage limit in the Description | 1 |
| Operating temperature range |  | 0 |  | 100 | °C | Stated as the operating temperature range in the Description | 1 |

## CAD (KiCad official)

- Symbol: `FLD0503-3.3YDFN1X1G`
- Footprint: `Package_DFN_QFN:UDFN-4-1EP_1x1mm_P0.65mm_EP0.48x0.48mm`
- 3D model: DFN-4L(1x1) (KiCad packages3D, STEP)
- 3D model files: `fld0503-3-3ydfn1x1g-etched.step` / `fld0503-3-3ydfn1x1g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `fld0503-3-3ydfn1x1g.step` / `fld0503-3-3ydfn1x1g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Full Way datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590908600892141568) (9 pp, sha256 `9fcc42109aca460c`, 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/fld0503-3-3ydfn1x1g-datasheet.pdf)