# TP8350-SOT89-R

**TOPPOWER Nanjing Extension Microelectronics** · DC-DC Converters · SOT-89-3

TP8350-SOT89-R from TOPPOWER Nanjing Extension Microelectronics, in a SOT-89-3. 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 | Vss | power_in | Ground pin; the datasheet advises connecting Vss to ground sufficiently, because otherwise the internal zero-voltage reference shifts with switch current and the converter can become unstable. |
| 2 | OUT | power_out | Output voltage pin; for TP8350 the output is 5.000 V typical (4.875 V to 5.125 V), and the absolute maximum output pin current is 800 mA. |
| 3 | Lx | output | Switch pin that drives the inductor (EXT for external MOS variants); for TP8350 the Lx switching current is 570 mA minimum at VLX = 0.4 V and the Lx leakage is 1 µA maximum at VLX = 6 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TOPPOWER Nanjing Extension Microelectronics |
| Package | SOT-89-3 |
| Category | Power Management (PMIC) |
| Pins | 3 |

## 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 | Vout | 4.875 | 5 | 5.125 | V |  | 5 |
| Input Current1 | IIN1 | 8 | 15 | 25 | µA | VIN=2.2V | 5 |
| Input Current2 | IIN2 | 2 |  | 4 | µA |  | 5 |
| Start-up Voltage | Vstart | 0.5 | 0.8 | 0.9 | V | IL=1mA; VIN: 0→0.98V | 5 |
| Hold-on Voltage | Vhold | 0.3 | 0.5 | 0.6 | V | IL=1mA; VIN: 0.98→0V | 5 |
| Lx Switching Current | ILX |  | 570 |  | mA | VLX=0.4V | 5 |
| Lx Leakage Current | ILxleak |  | 1 |  | µA | VLX=6V | 5 |
| Osc Frequency | FOSC | 150 | 200 | 250 | kHz |  | 5 |
| Duty | Dty |  | 80 |  | % |  | 5 |
| Efficiency | η |  | 85 |  | % |  | 5 |
| Input Pin Voltage | VIN |  |  | 10 | V |  | 3 |
| Output Pin Current | Iout |  |  | 800 | mA |  | 3 |
| Power Dissipation (SOT-89) | Pd |  |  | 500 | mW | SOT-89 | 3 |
| Operation Temperature | Topt | -40 |  | 125 | ºC |  | 3 |
| Lead Temperature (Soldering) | Tsolder |  |  | 260 | ºC | Soldering 10mS | 3 |

## CAD (KiCad official)

- Symbol: `TP8350-SOT89-R`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89-3 (KiCad packages3D, STEP)
- 3D model files: `tp8350-sot89-r-etched.step` / `tp8350-sot89-r-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tp8350-sot89-r.step` / `tp8350-sot89-r.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TOPPOWER Nanjing Extension Microelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588879193589354496) (10 pp, sha256 `fe26715dd09289dd`, 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/tp8350-sot89-r-datasheet.pdf)