# XTP2021-280AD1CT

**XTX** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · DFN1x1-4L

XTP2021-280AD1CT from XTX, in a DFN1x1-4L. 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 of the regulator; for this 2.8V variant (XTP2021-280AD1CT) it must stay within the absolute maximum VOUT-to-GND range of -0.3 V to 6 V and VOUT-to-VIN of -6 V to 0.3 V. |
| 2 | GND | power_in | Ground reference for the regulator; VIN-to-GND is rated -0.3 V to 6.5 V absolute maximum. |
| 3 | EN | input | Enable control input with a rising threshold (VIH) of 0.9 V and a falling threshold (VIL) of 0.60 V, rated -0.3 V to 6 V to GND, and it turns the output off when driven low. |
| 4 | VIN | power_in | Input supply voltage, recommended 1.8 V to 5.5 V, with an absolute maximum of 6.5 V to GND. |
| 5 | SGND | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | XTX |
| Package | DFN1x1-4L |
| 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 |
|---|---|---|---|---|---|---|---|
| Input Voltage (Supply Voltage) | VIN | 1.8 |  | 5.5 | V |  | 7 |
| DC Output Voltage Accuracy |  | -2 |  | 2 | % | ILOAD = 0.1mA | 7 |
| EN Input Current | IEN | 0.001 | 0.005 | 0.01 | uA | VEN = 5V | 7 |
| Input Voltage (Recommended Operating) | VIN | 1.8 |  | 5.5 | V |  | 6 |
| Junction Temperature Range | TJ | -40 |  | 125 | ℃ |  | 6 |
| Ambient Temperature Range | TA | -40 |  | 85 | ℃ |  | 6 |
| VIN to GND | VIN | -0.3 |  | 6.5 | V |  | 6 |
| VOUT, EN to GND |  | -0.3 |  | 6 | V |  | 6 |
| VOUT to VIN |  | -6 |  | 0.3 | V |  | 6 |
| Junction Temperature |  | -40 |  | 150 | ℃ |  | 6 |
| Storage Temperature Range |  | -60 |  | 150 | ℃ |  | 6 |

## CAD (KiCad official)

- Symbol: `XTP2021-280AD1CT`
- Footprint: `Package_DFN_QFN:UDFN-4-1EP_1x1mm_P0.65mm_EP0.48x0.48mm`
- 3D model: DFN1x1-4L (KiCad packages3D, STEP)
- 3D model files: `xtp2021-280ad1ct-etched.step` / `xtp2021-280ad1ct-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `xtp2021-280ad1ct.step` / `xtp2021-280ad1ct.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [XTX datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8757133543829057536) (11 pp, sha256 `1cd2f6e5b59fc78f`, retrieved 2026-10-21, 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/xtp2021-280ad1ct-datasheet.pdf)