# RY8411

**RYCHIP** · DC-DC Converters · SOT-23-6

RY8411 from RYCHIP, in a SOT-23-6. 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 | BS | passive | Bootstrap pin. A capacitor connected between SW and BS forms a floating supply across the high-side switch driver. Absolute max BS voltage is 7V above SW. |
| 2 | GND | power_in | Ground pin. Common return for the IC and reference for all voltages. |
| 3 | FB | input | Adjustable-version feedback input. Connect to the center point of the external resistor divider that sets VOUT. Internal reference (VFB) is 0.800V typical (0.780-0.820V). Absolute max 6V. |
| 4 | EN | input | Enable input. Drive high (>1.3V typ) to enable the IC; drive low (<0.9V) to disable and enter micro-power shutdown. Absolute max is (VIN + 0.3V) to 42V. |
| 5 | IN | power_in | Power supply input. Operating range 4V to 38V; absolute max 42V. Bypass with a ceramic capacitor placed close to this pin. |
| 6 | SW | power_out | Switching node. Connects to the external inductor and to the bootstrap capacitor. Absolute max −0.3V to VIN+1V (−5V to VIN+2V for 10ns transients). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | RYCHIP |
| Package | SOT-23-6 |
| Category | PMIC |
| Pins | 6 |

## Ordering variants

Same part, different packaging or reel option.

- `RY8411HOYLL`

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Input Voltage Range |  | 4 |  | 38 | V |  | 4 |
| Supply Current (Quiescent) |  |  | 0.4 | 0.8 | mA | VEN =3.0V | 4 |
| Supply Current (Shutdown) |  |  |  | 10 | uA | VEN =0 or EN = GND | 4 |
| Feedback Voltage | VFB | 0.78 | 0.8 | 0.82 | V |  | 4 |
| High-Side Switch On-Resistance | RDS(ON) |  | 250 |  | mΩ | ISW=100mA | 4 |
| Low-Side Switch On-Resistance | RDS(ON) |  | 150 |  | mΩ | ISW=-100mA | 4 |
| Upper Switch Current Limit |  |  | 2 |  | A |  | 4 |
| Over Voltage Protection Threshold |  |  | 39 |  | V |  | 4 |
| Switching Frequency |  |  | 800 |  | KHz |  | 4 |
| Maximum Duty Cycle |  |  | 92 |  | % | VFB=90% | 4 |
| Minimum On-Time |  |  | 90 |  | nS |  | 4 |
| EN Rising Threshold |  |  | 1.3 |  | V |  | 4 |
| EN Falling Threshold |  |  | 0.9 |  | V |  | 4 |
| Under-Voltage Lockout Threshold, Wake up VIN Voltage |  | 3.6 |  | 3.8 | V |  | 4 |
| Under-Voltage Lockout Threshold, Shutdown VIN Voltage |  | 3.1 |  | 3.3 | V |  | 4 |
| Under-Voltage Lockout Hysteresis VIN voltage |  |  | 300 |  | mV |  | 4 |
| Soft Start |  |  |  | 1 | mS |  | 4 |
| Thermal Shutdown |  |  | 150 |  | ℃ |  | 4 |
| Thermal Hysteresis |  |  | 20 |  | ℃ |  | 4 |
| Operating junction temperature | TJ | -40 |  | 125 | °C |  | 3 |
| Operating temperature range | TA | -40 |  | 85 | °C |  | 3 |
| Input voltage | VIN | 4 |  | 38 | V |  | 3 |
| Output current |  | 0 |  | 1.2 | A |  | 3 |
| VIN voltage | VIN | -0.3 |  | 42 | V |  | 3 |
| EN voltage | EN | -0.3 |  |  | V | maximum printed as VIN + 0.3 V | 3 |
| SW voltage | SW | -0.3 |  |  | V | maximum printed as VIN+1V | 3 |
| SW voltage (10 ns transient) | SW | -5 |  |  | V | 10 ns transient; maximum printed as VIN+2V | 3 |
| BS voltage | BS |  |  | 7 | V |  | 3 |
| FB voltage | FB | -0.3 |  | 6 | V |  | 3 |
| Operating junction temperature, TJ | TJ | -40 |  | 150 | °C |  | 3 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 3 |
| Lead Temperature (Soldering) |  |  |  | 260 | °C | Soldering, 10 sec. | 3 |
| Junction-to-ambient thermal resistance | RθJA |  | 105 |  | °C/W |  | 4 |
| Junction-to-case (top) thermal resistance | RθJC(top) |  | 55 |  | °C/W |  | 4 |
| Junction-to-board thermal resistance | RθJB |  | 17.5 |  | °C/W |  | 4 |
| Junction-to-top characterization parameter | ψJT |  | 3.5 |  | °C/W |  | 4 |
| Junction-to-board characterization parameter | ψJB |  | 17.5 |  | °C/W |  | 4 |

## CAD (KiCad official)

- Symbol: `RY8411`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files: `ry8411-etched.step` / `ry8411-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ry8411.step` / `ry8411.glb` are the bare package body.

## 3D model downloads

Two STEP files. Same geometry, different body top:

| File | Size | Use it when |
|---|---|---|
| [`ry8411.step`](ry8411.step) | 97 KB | You want the bare part, or you mark your own boards. |
| [`ry8411-etched.step`](ry8411-etched.step) | 1.2 MB | You want the part with `RY8411` already on it. |

The marking in the etched file is real recessed geometry cut into the solid, not a
texture or a decal: 322 faces against 117 in the bare model. It
survives export, section views, and rendering in any CAD tool, and it drops straight
into KiCad or Fusion with no extra setup.

## Provenance

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

- **Datasheet:** [RYCHIP datasheet](docs/ry8411-datasheet.pdf) (13 pp, sha256 `fff802a5d18d557a`, retrieved 2026-08-17, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/ry8411-datasheet.pdf)