# LW5228N11E

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

LW5228N11E from Lewa Micro, 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 | Regulated output pin that needs a low-ESR capacitor of at least the recommended nominal value (1 µF minimum per the Output Capacitor Selection section) from OUT to GND, and an internal pulldown discharges OUT when the regulator is in shutdown. |
| 2 | GND | power_in | Ground pin, which should connect to the separate GND plane used for the device. |
| 3 | EN | input | Enable pin: drive EN above VEN(HI) to turn the regulator on and below VEN(LO) to put the LDO into shutdown mode. |
| 4 | VIN | power_in | Input pin that should have the recommended value or larger ceramic capacitor from IN to ground, placed as close to the device as possible for best transient response. |
| 5 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `LW5228N11E`
- Footprint: `Package_DFN_QFN:UDFN-4-1EP_1x1mm_P0.65mm_EP0.48x0.48mm`
- 3D model: DFN-4L(1x1) (KiCad packages3D, STEP)
- 3D model files: `lw5228n11e-etched.step` / `lw5228n11e-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lw5228n11e.step` / `lw5228n11e.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Lewa Micro datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8775070430988521472) (22 pp, sha256 `554585e66fced619`, retrieved 2026-10-09, 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/lw5228n11e-datasheet.pdf)