# XTB1056L420AD3CT

**XTX** · Battery Management · DFN-8(2x2)

XTB1056L420AD3CT from XTX, in a DFN-8(2x2). 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 | VIN | power_in | Power input accepting up to 28V maximum, with charging disabled when the input exceeds the OVP threshold (6.8V for this L variant). |
| 2 | PPR | output | Open-drain power-presence indicator that stays low while the input voltage is within the operating range and is high impedance otherwise. |
| 3 | CHG | output | Open-drain charge indicator that stays low during the charging state and is high impedance otherwise. |
| 4 | EN | input | Active-low enable input that turns the charger on or off, as shown in the typical application circuit. |
| 5 | GND | power_in | Ground, connected to the RIREF and RIMIN resistors and to the battery negative terminal. |
| 6 | IMIN | passive | Connects an external resistor (RIMIN) to GND to program the end-of-charge current. |
| 7 | IREF | passive | Connects an external resistor (RIREF) to GND to program the charge current. |
| 8 | BAT | power_out | Battery connection for the single-cell Li-ion battery, charged with a 4.2V float voltage in this variant. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | XTX |
| Package | DFN-8(2x2) |
| Category | Power Management (PMIC) |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `XTB1056L420AD3CT`
- Footprint: `Package_DFN_QFN:DFN-8_2x2mm_P0.5mm`
- 3D model: DFN-8(2x2) (KiCad packages3D, STEP)
- 3D model files: `xtb1056l420ad3ct-etched.step` / `xtb1056l420ad3ct-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `xtb1056l420ad3ct.step` / `xtb1056l420ad3ct.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/8602988366212718592) (5 pp, sha256 `8f230f3c5e9b9932`, retrieved 2026-10-19, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/xtb1056l420ad3ct-datasheet.pdf)