# HX3608

**HX hengjiaxing** · DC-DC Converters · SOT-23-6L

HX3608 from HX hengjiaxing, in a SOT-23-6L. 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 | SW | output | Switching node. Drain of the internal 4A NMOS power switch; connects to the boost inductor and Schottky rectifier. Carries the high-frequency switching waveform (1.2MHz) and must be routed short and isolated from sensitive nets. Absolute max 28V, RDS(on) ~80mΩ. |
| 2 | GND | power_in | Ground reference for the device. Return path for the power switch and internal control circuitry. |
| 3 | FB | input | Feedback input to the error amplifier. Connect a resistor divider from VOUT to FB to GND to set output voltage: VOUT = 0.6V x (1 + R1/R2). Internal reference VR = 600mV (588-612mV). R1 recommended in the hundreds-of-kΩ range. |
| 4 | EN | input | Chip enable, active high. VENH >= 1.2V enables the converter; VENL <= 0.5V shuts it down (IOFF <= 1µA). Do not leave floating. |
| 5 | VIN | power_in | Supply/bias input for internal control circuitry. Operating range 2-24V (UVLO ~1.7-2V). Requires a 1uF ceramic decoupling capacitor to GND close to the pin. May be tied to VIN or to VOUT; when VIN < 5V, tying pin 5 to VOUT is recommended to strengthen gate drive. |
| 6 | NC | unconnected | No connect. Leave floating. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HX hengjiaxing |
| Package | SOT-23-6L |
| Category | PMIC |
| Pins | 6 |

## Ordering variants

Same part, different packaging or reel option.

- `HX3608AR`
- `HX3608AL`

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| 输入电压 | VIN | 2 |  | 24 | V |  | 3 |
| 输出电压 | VOUT | 2.5 |  | 28 | V |  | 3 |
| 输入欠压保护 | UVLO_F | 1.7 |  | 2 | V |  | 3 |
| 关断电流 | IOFF |  |  | 1 | µA | VEN<VENL | 3 |
| 反馈基准电压 | VR | 588 | 600 | 612 | mV | VOUT=5V | 3 |
| 功率管内阻 | RDSON |  | 80 | 150 | mΩ | VIN=5V | 3 |
| 开关电流 | ISW | 3.5 |  |  | A | VIN=5V | 3 |
| EN 高电平 | VENH | 1.2 |  |  | V | VIN=3.6V | 3 |
| EN 低电平 | VENL |  |  | 0.5 | V | VIN=3.6V | 3 |
| SW 端漏电流 | ISW_L |  |  | 1 | uA | VSW=20V | 3 |
| 输入电压（绝对最大额定值） | VIN | -0.3 |  | 24 | V |  | 3 |
| 输出电压（绝对最大额定值） | VOUT | -0.3 |  | 28 | V |  | 3 |
| SW 端电压（绝对最大额定值） | VSW | -0.3 |  | 28 | V |  | 3 |
| SW 端开关电流 | ISW |  |  | 3.5 | A |  | 3 |
| 容许功耗 | PD |  |  | 250 | mW |  | 3 |
| 工作环境温度 | Topr | -40 |  | 80 | ℃ |  | 3 |
| 保存温度 | Tstg | -40 |  | 125 | ℃ |  | 3 |

## CAD (KiCad official)

- Symbol: `HX3608`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT-23-6L (KiCad packages3D, STEP)
- 3D model files: `hx3608-etched.step` / `hx3608-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `hx3608.step` / `hx3608.glb` are the bare package body.

## 3D model downloads

Two STEP files. Same geometry, different body top:

| File | Size | Use it when |
|---|---|---|
| [`hx3608.step`](hx3608.step) | 97 KB | You want the bare part, or you mark your own boards. |
| [`hx3608-etched.step`](hx3608-etched.step) | 1.6 MB | You want the part with `HX3608` already on it. |

The marking in the etched file is real recessed geometry cut into the solid, not a
texture or a decal: 390 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:** [HX hengjiaxing datasheet](docs/hx3608-datasheet.pdf) (6 pp, sha256 `c124e6edb58bd1df`, 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/hx3608-datasheet.pdf)