L5973ADTR

@@ -0,0 +1,49 @@+# L5973ADTR++**STMicroelectronics** · DC-DC Converters · HSOP-8-EP++L5973ADTR from STMicroelectronics, in a HSOP-8-EP. 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 | OUT | output | Regulator switch output. Internal P-channel D-MOS drain that drives the external inductor; source of the switching node (up to 2 A internal switch limit). Output DC voltage rated -1 V to 40 V. |+| 2 | SYNC | bidirectional | Master/slave synchronization pin. When open, provides an output signal synchronous with the turn-off of the internal power switch. When driven with an external clock higher than the internal 500 kHz, the device synchronizes to it. Tying the SYNC pins of two devices together makes the higher-frequency device the master. Absolute max ±0.3 V to 4 V. |+| 3 | INH | input | Active-high inhibit input. VINH > 2.2 V disables the device (standby); VINH < 0.8 V enables it. Has an internal pull-up, so if left open the device is disabled; if unused it must be tied to ground. Absolute max -0.3 V to VCC. |+| 4 | COMP | output | Error amplifier output, used for frequency loop compensation. Typical external network is an RC/CC series to GND (e.g. 4.7 kΩ + 22 nF with 220 pF in parallel). |+| 5 | FB | input | Step-down feedback input to the internal error amplifier (reference 1.235 V typ). Connect the output directly for VOUT = 1.235 V; use a resistor divider (with the lower resistor typically 4.7 kΩ) for higher output voltages up to 35 V. Absolute max 4 V. |+| 6 | VREF | power_out | Internal 3.3 V ±2% reference voltage output. No filter capacitor is required for stability. Absolute max 4 V. |+| 7 | GND | power_in | Device ground and power return. Exposed pad on the HSOP8 package should be connected to this ground plane for thermal dissipation (RthJA ≈ 40 °C/W). |+| 8 | VCC | power_in | Unregulated DC input supply for both the control circuitry and the internal power P-DMOS switch. Operating range 4 V to 36 V, absolute maximum 40 V. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | STMicroelectronics |+| Package | HSOP-8-EP |+| Category | PMIC |+| Pins | 8 |++## Ordering variants++Same part, different packaging or reel option.++- `L5973ADTR`++## CAD (KiCad official)++- Symbol: `L5973ADTR`+- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm`+- 3D model: HSOP-8-EP (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [STMicroelectronics datasheet](https://www.st.com/resource/en/datasheet/l5973adtr.pdf) (22 pp, sha256 `5657968dab13e305`, retrieved 2026-08-17, tier: manufacturer)+- **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/l5973adtr-datasheet.pdf)

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