# RT5789BGJ8F

**Richtek Tech** · DC-DC Converters · TSOT-23-8

RT5789BGJ8F from Richtek Tech, in a TSOT-23-8. 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 | PGOOD | output | Open-drain power-good indication output that is activated only after soft-start is finished. |
| 2 | VIN | power_in | Power input with an input voltage range of 2.5V to 6V; connect a bypass capacitor typically greater than 10µF between this pin and PGND, placed as close to the IC as possible. |
| 3 | LX | power_out | Switch node between the internal switch and the synchronous rectifier; connect the output LC filter from this pin to the output load. |
| 4 | PGND | power_in | Power ground, connected to analog ground, that must be soldered to a large PCB copper area for maximum power dissipation. |
| 5 | VOUT | input | Output voltage sense input used to monitor and adjust the output voltage for improved load transient regulation. |
| 6 | AGND | power_in | Analog ground providing the return path for control circuitry and the internal reference, to be connected to a clean inner GND point with a separate trace. |
| 7 | FB | input | Feedback voltage input connected to the midpoint of the external resistive divider; the device regulates FB to a typical 0.6V reference. |
| 8 | EN | input | Enable control input where a logic-high enables the converter and a logic-low forces shutdown mode. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Richtek Tech |
| Package | TSOT-23-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `RT5789BGJ8F`
- Footprint: `Package_TO_SOT_SMD:TSOT-23-8`
- 3D model: TSOT-23-8 (KiCad packages3D, STEP)
- 3D model files: `rt5789bgj8f-etched.step` / `rt5789bgj8f-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rt5789bgj8f.step` / `rt5789bgj8f.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Richtek Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590908738368978944) (24 pp, sha256 `3724d935031b0e0f`, 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/rt5789bgj8f-datasheet.pdf)