# RT8259GJ6

**Richtek Tech** · DC-DC Converters · TSOT-23-6L

RT8259GJ6 from Richtek Tech, in a TSOT-23-6L. 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 | BOOT | passive | Bootstrap pin: a capacitor (10nF low-ESR ceramic per the application section) connects between BOOT and PHASE to form the floating supply for the high-side gate driver, with BOOT limited to VPHASE + 6V. |
| 2 | GND | power_in | Ground and voltage reference for the regulated output; it should be routed outside the D1-to-C1 ground path so switching current spikes do not couple noise into the part. |
| 3 | FB | input | Feedback input: an external resistor divider from VOUT to GND sets the output voltage using a 0.8V typical reference (0.784V to 0.816V), and the divider values also set loop bandwidth. |
| 4 | EN | input | Active-high chip enable with logic-high at 1.4V minimum and logic-low at 0.4V maximum, an allowed input range of 0V to 5.5V, and an internal pull-up to high when left open. |
| 5 | VIN | power_in | Supply input operating from 4.5V to 24V (26V absolute maximum), which should be bypassed to GND with a suitably large capacitor to limit voltage spikes. |
| 6 | PHASE | output | Switch output node of the internal power MOSFET, with a voltage range of -0.3V to (VIN + 0.3V), that should be kept small in area to limit high-frequency swing and noise. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Richtek Tech |
| Package | TSOT-23-6L |
| Category | Power Management (PMIC) |
| Pins | 6 |

## CAD (KiCad official)

- Symbol: `RT8259GJ6`
- Footprint: `Package_TO_SOT_SMD:TSOT-23-6`
- 3D model: TSOT-23-6L (KiCad packages3D, STEP)
- 3D model files: `rt8259gj6-etched.step` / `rt8259gj6-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rt8259gj6.step` / `rt8259gj6.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/8588884613997735936) (13 pp, sha256 `be2723909ec33bd2`, 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/rt8259gj6-datasheet.pdf)