TX4401

@@ -0,0 +1,46 @@+# TX4401++**XDS** · DC-DC Converters · ESOP-8++TX4401 from XDS, in a ESOP-8. 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 | RT | input | Oscillator frequency programming pin. A resistor from RT to GND sets the internal switching frequency (adjustable 350 kHz to 1.5 MHz). Typical value 60.4 kΩ sets fOSC ≈ 1 MHz per the application circuit. |+| 2 | MODE/SYNC | input | Dual-function mode select and external clock synchronisation input. Drive high to enter the 50μA low-power (light-load) mode; can also be driven with an external clock to synchronise the internal oscillator. |+| 3 | SW1 | passive | Switch node 1. Connects to one terminal of the external buck-boost inductor; internally tied to the SW A (high-side input) and SW B (low-side to GND) power MOSFETs. |+| 4 | SW2 | passive | Switch node 2. Connects to the other terminal of the external buck-boost inductor; internally tied to the SW C (low-side to GND) and SW D (high-side to VOUT) power MOSFETs. |+| 5 | GND | power_in | Device ground. Return for the power MOSFETs and internal control circuitry; connect to the system ground plane. |+| 6 | VOUT | power_out | Regulated output voltage. Range 2.5V-5.5V (per internal block diagram); connect an output filter capacitor (e.g. 22μF) to GND close to the pin. |+| 7 | VIN | power_in | Input supply pin. 2.7V-5.5V for the MSOP-10 variant. Bypass with a low-ESR capacitor of at least 4.7μF as close to the pin as possible. Absolute maximum 6V. |+| 8 | EN | input | Enable / shutdown input. Drive high to enable the converter, drive low to place the device into <1μA shutdown mode. |+| 9 | FB | input | Feedback pin. Regulated to an internal 1.22V reference; connect to the mid-point of the output resistor divider to program VOUT (VOUT = 1.22 × (1 + R1/R2)). |+| 10 | VC | output | Error-amplifier output / loop-compensation node. Connect an external RC network (e.g. 15kΩ + 1.5nF to GND per the application circuit) here to shape the control-loop response. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | XDS |+| Package | ESOP-8 |+| Category | PMIC |+| Pins | 10 |++## CAD (KiCad official)++- Symbol: `TX4401`+- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm`+- 3D model: ESOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [XDS datasheet](docs/tx4401-datasheet.pdf) (7 pp, sha256 `3fd3b5b827543a76`, retrieved 2026-08-17, 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:** `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/tx4401-datasheet.pdf)

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