TX4120x

@@ -0,0 +1,48 @@+# TX4120x++**XDS** · DC-DC Converters · SOT-23-6++TX4120x from XDS, in a SOT-23-6. 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 | FB | input | Feedback input for the internal error amplifier. An external resistor divider from VOUT to FB sets the output voltage per VOUT = VREF*(R1+R2)/R2 with VREF = 0.9 V. Output over-voltage threshold is 1.1*VFB. |+| 2 | GND | power_in | Device ground return for the internal power stage, control logic, and reference. |+| 3 | VDD | power_in | Main input supply, 4.5 V to 36 V absolute max (VIN limited to 27 V when EN switching is used). Bypass close to the pin with a low-ESR ceramic capacitor (X5R/X7R recommended). |+| 4 | SW | output | Switching node connecting the internal high-side and low-side MOSFETs. Connect to the external buck inductor and the low-side of the BST bootstrap capacitor. Absolute rating: -0.3 V to VIN+0.3 V. |+| 5 | BST | passive | Bootstrap supply for the high-side gate driver. Connect a 100 nF ceramic capacitor between BST and SW; capacitor is refreshed from an internal LDO and typically holds ~5.3 V above SW. |+| 6 | CS/LED/EN | bidirectional | Function of pin 6 depends on the factory option: TX4120C = CS (current-limit setting resistor to GND for adjustable current mode), TX4120D = LED (LED status indicator, open-drain to LED cathode), TX4120E = EN (active-high enable input with internal pull-up; leave open to enable). Absolute max on this pin is 6 V. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | XDS |+| Package | SOT-23-6 |+| Category | PMIC |+| Pins | 6 |++## Ordering variants++- `TX4120xTX4120C`+- `TX4120xTX4120D`+- `TX4120xTX4120E`++## CAD (KiCad official)++- Symbol: `TX4120x`+- Footprint: `Package_TO_SOT_SMD:SOT-23-6`+- 3D model: SOT-23-6 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [XDS datasheet](docs/tx4120x-datasheet.pdf) (10 pp, sha256 `041da529f91f7840`, 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/tx4120x-datasheet.pdf)

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