# RY9120

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

RY9120 from RYCHIP, in a SOT-23-6. 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 | BS | passive | Bootstrap pin: a capacitor connected between SW and the BST pin is required to form a floating supply across the high-side switch driver. |
| 2 | GND | power_in | Ground pin for the device. |
| 3 | FB | input | Adjustable-version feedback input; connect to the center point of the external resistor divider, with VFB of 0.585V min, 0.6V typ, 0.615V max. |
| 4 | EN | input | Drive to logic-high to enable the IC and to logic-low to disable it into micro-power shutdown; the EN rising threshold is 1.4V and the falling threshold is 0.8V. |
| 5 | IN | power_in | Power supply pin; the input voltage range is 4.5V to 17V, with an absolute maximum of 18V. |
| 6 | SW | output | Switching pin, the output of the internal power MOSFETs; absolute maximum SW voltage is -3V to 19V (-5V to 19V for transients under 10 ns). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | RYCHIP |
| Package | SOT-23-6 |
| Category | Power Management (PMIC) |
| Pins | 6 |

## 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 |  | 4.5 |  | 17 | V |  | 4 |
| Supply Current (Quiescent) |  |  | 0.6 | 0.8 | mA | VEN =3.0V | 4 |
| Supply Current (Shutdown) |  |  | 4 |  | uA | VEN =0 or EN = GND | 4 |
| Feedback Voltage | VFB | 0.585 | 0.6 | 0.615 | V |  | 4 |
| High-Side Switch On-Resistance |  |  | 110 |  | mΩ | ISW=100mA | 4 |
| Low-Side Switch On-Resistance |  |  | 70 |  | mΩ | ISW=-100mA | 4 |
| Valley Switch Current Limit |  |  | 2 |  | A |  | 4 |
| Over Voltage Protection Threshold |  |  | 18 |  | V |  | 4 |
| Switching Frequency |  |  | 500 |  | KHz |  | 4 |
| Maximum Duty Cycle |  |  | 94 |  | % | VFB=90% | 4 |
| Minimum Off-Time |  |  | 89 |  | nS |  | 4 |
| EN Rising Threshold |  |  | 1.4 |  | V |  | 4 |
| EN Falling Threshold |  |  | 0.8 |  | V |  | 4 |
| Under-Voltage Lockout Threshold, Wake up VIN Voltage |  | 4.3 |  | 4.5 | V |  | 4 |
| Under-Voltage Lockout Threshold, Shutdown VIN Voltage |  | 3.6 |  | 3.8 | V |  | 4 |
| Under-Voltage Lockout Threshold, Hysteresis VIN voltage |  |  | 500 |  | mV |  | 4 |
| Soft Start |  |  | 1.5 |  | mS |  | 4 |
| Thermal Shutdown |  |  | 160 |  | ℃ |  | 4 |
| Thermal Hysteresis |  |  | 30 |  | ℃ |  | 4 |
| VIN voltage | VIN | -0.3 |  | 18 | V |  | 3 |
| EN voltage |  | -0.3 |  | 18 | V |  | 3 |
| SW voltage |  | -3 |  | 19 | V |  | 3 |
| SW voltage (transient) |  | -5 |  | 19 | V | <10 ns transient | 3 |
| BS voltage (to SW) |  | -0.3 |  | 6.5 | V |  | 3 |
| FB voltage |  | -0.3 |  | 6 | V |  | 3 |
| Operating junction temperature | TJ | -40 |  | 150 | °C |  | 3 |
| Storage temperature | Tstg | -55 |  | 150 | °C |  | 3 |
| Lead Temperature (Soldering) |  |  |  | 260 | °C | Soldering, 10 sec. | 3 |
| ESD Human Body Model (HBM) | V(ESD-HBM) | -2000 |  | 2000 | V | ANSI/ESDA/JEDEC JS-001-2014, Class 2 | 3 |
| ESD Charged Device Model (CDM) | V(ESD-CDM) | -200 |  | 200 | V | ANSI/ESDA/JEDEC JS-002-2014, Class C0b | 3 |
| Latch-up | ILATCH-UP | -150 |  | 150 | mA | JEDEC STANDARD NO.78E, Class I | 3 |
| Operating junction temperature |  | -40 |  | 125 | °C |  | 3 |
| Operating temperature range |  | -40 |  | 85 | °C |  | 3 |
| Input voltage | VIN | 4.5 |  | 17 | V |  | 3 |
| Output current |  | 0 |  | 2 | A |  | 3 |
| Junction-to-ambient thermal resistance | RθJA |  | 105 |  | °C/W | JESD 51-7, 4-layer JEDEC board | 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: `RY9120`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files: `ry9120-etched.step` / `ry9120-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ry9120.step` / `ry9120.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [RYCHIP datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588941083333681152) (13 pp, sha256 `9324276bc02bab6b`, 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/ry9120-datasheet.pdf)