# RS2588BYF5

**Jiangsu RUNIC Tech** · Power Distribution Switches · SOT-23-5

RS2588BYF5 from Jiangsu RUNIC Tech, in a SOT-23-5. 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 | VOUT | power_out | Switch output, the drain of the internal P-channel MOSFET, which typically connects to the load; the switch turns off when VOUT exceeds VIN by 40mV, and VOUT may be externally forced above VIN while the switch is disabled. |
| 2 | GND | power_in | Ground reference for the device; all voltages in the datasheet are specified with respect to the GND pin. |
| 3 | FLAG | output | Active-low open-drain flag output that asserts on over-current (after the approximately 13ms response delay tD) or thermal shutdown, with a low-level output voltage of 0.4V max at 2mA sink current and 1.0µA max leakage when high. |
| 4 | EN | input | Active-high logic-level enable input with VIL max 0.4V and VIH min 1.6V, and an internal pull-down of 450kΩ to 600kΩ. |
| 5 | VIN | power_in | Power supply input that is the source of the internal P-channel MOSFET and supplies the internal circuitry, operating from 2.5V to 5.5V with an absolute maximum of 6.0V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Jiangsu RUNIC Tech |
| Package | SOT-23-5 |
| Category | Power Management (PMIC) |
| Pins | 5 |

## 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 | VIN | 2.5 |  | 5.5 | V |  | 8 |
| Quiescent supply current | IQ | 10 | 30 | 50 | μA | Switch on, VOUT = open | 8 |
| Shutdown supply current | ISD | 0.1 |  | 1 | μA | Switch off, VOUT = open | 8 |
| Leakage current of VIN | ILKG(VIN) | 0.1 |  | 1 | μA | Switch off, VOUT = 0V | 8 |
| EN input current | IEN | 10 |  | 15 | μA | VEN = 0V to 5.5V | 8 |
| EN Pin Pull-Down Resistance | RPULL_DOWN | 450 | 520 | 600 | kΩ | VEN = 2.5V to 5.5V | 8 |
| Switch resistance | RDS(ON) |  | 70 | 80 | mΩ | IOUT = 500mA | 8 |
| Current limit threshold (RS2588B) | ILIM | 1.89 | 2.1 | 2.31 | A | Ramped load | 8 |
| Under-Voltage Lockout Threshold | VUVLO | 1.9 |  | 2.3 | V | VIN rising | 8 |
| Output turn-on delay time | tON |  |  | 2 | ms | RL = 10Ω, CL = 1μF, Figure 4,5 | 8 |
| Output turn-off delay time | tOFF |  |  | 20 | μs | RL = 10Ω, CL = 1μF, Figure 6,7 | 8 |
| Leakage current of FLAG | ILKG(FLAG) | 0.1 |  | 1 | μA | FLAG is HIGH | 8 |
| VOUT shutdown discharge resistance | RDIS | 250 | 300 | 350 | Ω | Switch off | 8 |
| Enable input threshold (VIL) | VIL |  | 0.4 |  | V | VIN = 2.5V to 5.5V | 8 |
| Enable input threshold (VIH) | VIH |  | 1.6 |  | V | VIN = 2.5V to 5.5V | 8 |
| UVLO threshold hysteresis | VUVLO_HY |  | 0.15 |  | V |  | 8 |
| Over-current FLAG response delay time | tD |  | 13 |  | ms | Apply VOUT = 0 until FLAG is low | 8 |
| FLAG Output Low Voltage | VFLAG-L |  | 0.4 |  | V | CIN = 10uF, ISINK = 2mA | 8 |
| Thermal shutdown temperature | TSD |  | 150 |  | °C | TJ Increasing | 8 |
| Thermal shutdown hysteresis | TSD_HY |  | 30 |  | °C |  | 8 |
| Supply Input Voltage (absolute maximum) | VIN | -0.3 |  | 6 | V |  | 7 |
| Output Voltage (absolute maximum) | VOUT | -0.3 |  | 6 | V |  | 7 |
| EN Input Voltage (absolute maximum) | VEN | -0.3 |  | 6 | V |  | 7 |
| FLAG Output Voltage (absolute maximum) | VFLAG | -0.3 |  | 6 | V |  | 7 |
| Operating Junction Temperature (absolute maximum) | TJ | -40 |  | 150 | °C |  | 7 |
| Storage Temperature | Tstg | -65 |  | 150 | °C |  | 7 |
| Lead Temperature (Soldering, 10 secs) | TL |  |  | 260 | °C | Soldering, 10 secs | 7 |
| Input Voltage (recommended) | VIN | 2.5 |  | 5.5 | V |  | 7 |
| EN Voltage range (recommended) | VEN | 0 |  | 5.5 | V |  | 7 |
| All other pins voltage (recommended) |  | 0 |  | 5.5 | V |  | 7 |
| Operating Temperature Range | TA | -40 |  | 85 | °C |  | 7 |
| Operating Junction Temperature Range | TJ | -40 |  | 125 | °C |  | 7 |
| Junction-to-ambient thermal resistance | RθJA |  | 185.6 |  | °C/W | SOT23-5 | 7 |
| Junction-to-case (top) thermal resistance | RθJC(top) |  | 104.3 |  | °C/W | SOT23-5 | 7 |
| Junction-to-board thermal resistance | RθJB |  | 54.5 |  | °C/W | SOT23-5 | 7 |
| Junction-to-top characterization parameter | ψJT |  | 31 |  | °C/W | SOT23-5 | 7 |
| Junction-to-board characterization parameter | ψJB |  | 54.5 |  | °C/W | SOT23-5 | 7 |

## CAD (KiCad official)

- Symbol: `RS2588BYF5`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `rs2588byf5-etched.step` / `rs2588byf5-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rs2588byf5.step` / `rs2588byf5.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Jiangsu RUNIC Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589838201993912320) (18 pp, sha256 `d90ad53c2f60d1e4`, retrieved 2026-10-18, 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/rs2588byf5-datasheet.pdf)