# TX4144

**XDS** · DC-DC Converters · SOP-8

TX4144 from XDS, in a SOP-8. 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 | VIN | power_in | Chip supply input; the datasheet gives a 6-60 V operating input range and an absolute maximum of -0.3 to 65 V for the VIN and EN pins. |
| 2 | EN | input | Enable pin with 1.1 V rising and 0.8 V falling thresholds (300 mV hysteresis) and 100 µA maximum sink current; it must not be left floating and can be tied to VIN if enable control is not used. |
| 3 | FS | input | Switching-frequency setting pin: an external resistor to ground sets fSW, floating gives 140 kHz typical, the recommended maximum is 500 kHz, and the absolute range is -0.3 to 6 V. |
| 4 | FB | input | Feedback input compared against the 0.82 V internal reference (0.80-0.84 V) to set the output through the external R1/R2 divider, with an absolute range of -0.3 to 6 V. |
| 5 | VSS | power_in | Ground pin, to be connected with a large copper area together with VIN and SW to improve heat dissipation and long-term stability. |
| 6 | VSS | power_in | Ground pin, to be connected with a large copper area together with VIN and SW to improve heat dissipation and long-term stability. |
| 7 | SW | output | Switch output driving the inductor, with an absolute range of -0.3 V to VIN+0.3 V; its trace should be kept short and away from the FB feedback trace. |
| 8 | SW | output | Switch output driving the inductor, with an absolute range of -0.3 V to VIN+0.3 V; its trace should be kept short and away from the FB feedback trace. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | XDS |
| Package | SOP-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Feedback voltage | VFB | 0.8 | 0.82 | 0.84 | V | 6V< VIN < 60V | 4 |
| Feedback current | IFB |  |  | 0.1 | μA | VFB = 0.85V | 4 |
| SW switch leakage current | ISW_LKG |  |  | 1 | μA | VEN = 0V, VSW = 0V | 4 |
| Current limit threshold | ILIM |  | 2.4 |  | A |  | 4 |
| Oscillator frequency (FS floating) | fSW |  | 140 |  | kHz | FS 悬空 | 4 |
| Oscillator frequency (FS to GND via 470kΩ) | fSW |  | 450 |  | kHz | FS 接 470kΩ 到地 | 4 |
| Maximum duty cycle | DMAX |  |  | 95 | % | VFB = 0.6V | 4 |
| Minimum on time | τON | 100 |  |  | ns |  | 4 |
| Undervoltage lockout rising voltage | UUVLO_R |  | 5.5 |  | V |  | 4 |
| Undervoltage lockout hysteresis voltage | UUVLO_HYS |  | 700 |  | mV |  | 4 |
| EN rising threshold | VEN_R |  | 1.1 |  | V |  | 4 |
| EN falling threshold | VEN_F |  | 0.8 |  | V |  | 4 |
| EN hysteresis threshold | VEN_HYS |  | 300 |  | mV |  | 4 |
| EN output current | IEN |  |  | 0.1 | μA | VEN = 2V | 4 |
| VIN shutdown current | IS |  |  | 1 | μA | VEN = 0V | 4 |
| VIN quiescent current | IQ |  | 0.15 | 0.2 | mA | VEN = 2V，VFB = 1V | 4 |
| Thermal shutdown temperature | TSD |  | 165 |  | oC |  | 4 |
| Thermal shutdown hysteresis | TSD_HYS |  | 20 |  | oC |  | 4 |
| VIN, EN pin operating voltage range | VIN | -0.3 |  | 65 | V |  | 3 |
| SW pin operating voltage range (printed max is VIN+0.3, not numeric) | VSW | -0.3 |  |  | V |  | 3 |
| FB, FS pin operating voltage range | Vmax | -0.3 |  | 6 | V |  | 3 |
| EN pin sink current | IEN_SINK |  |  | 100 | μA |  | 3 |
| Operating temperature range | TA | -40 |  | 85 | oC |  | 3 |
| SOP8 package maximum power dissipation | PSOP8 |  |  | 0.8 | W |  | 3 |
| Storage temperature range | TSTG | -45 |  | 150 | oC |  | 3 |
| Soldering temperature range | TSD |  |  | 260 | oC | 时间小于30秒 | 3 |
| Electrostatic discharge voltage (human body model) | VESD |  |  | 2000 | V | 人体模型 | 3 |
| Input voltage range (from features list, not a formal recommended-operating table) | VIN | 6 |  | 60 | V |  | 1 |

## CAD (KiCad official)

- Symbol: `TX4144`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `tx4144-etched.step` / `tx4144-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tx4144.step` / `tx4144.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [XDS datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589834768440459264) (9 pp, sha256 `b31d4eae54563c6a`, retrieved 2026-10-18, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/tx4144-datasheet.pdf)