# TX5817

**XDS** · Battery Management · ESOP-8

TX5817 from XDS, in a ESOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | SW | output | Switch node of low-side power stage with 100 mΩ ON resistance, driven at 1.1 MHz switching frequency. |
| 2 | VIN | power_in | Power input pin rated 4.7 to 26 V absolute maximum with 11 V over-voltage protection threshold. |
| 3 | VLDO | power_out | Internal linear regulator output providing 4.9 V typical to power internal circuits and external LED indicator. |
| 4 | LED | output | Charging status indicator output for external LED to VLDO; illuminates during charging and extinguishes when charging complete. |
| 5 | NTC | input | Battery temperature detection input via external NTC thermistor; over-temperature shutdown at 150 °C with 20 °C hysteresis. |
| 6 | ISET | output | Charging current setting reference output with 1.19 V reference; external resistor RSET to ground sets charging current level. |
| 7 | BATT | power_out | Battery positive terminal output; charging termination voltage 8.4 V, recharge threshold 8.2 V, trickle charge threshold 5.8 V. |
| 8 | VSYS | power_out | System power output to dual-cell lithium battery from boost converter stage. |
| 9 | PGND | power_in | Power ground pin serving as signal reference and thermal dissipation pad. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | XDS |
| Package | ESOP-8 |
| Category | Power Management (PMIC) |
| Pins | 9 |

## CAD (KiCad official)

- Symbol: `TX5817`
- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm`
- 3D model: ESOP-8 (KiCad packages3D, STEP)
- 3D model files: `tx5817-etched.step` / `tx5817-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tx5817.step` / `tx5817.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [XDS datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590909326758391808) (9 pp, sha256 `3ecd9919cec53741`, retrieved 2026-09-17, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (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/tx5817-datasheet.pdf)