RT2872GSP

@@ -0,0 +1,48 @@+# RT2872GSP++**Richtek Tech** · DC-DC Converters · SOP-8-EP++RT2872GSP from Richtek Tech, in a SOP-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 | SW | power_out | Switch node. Drain of the high-side and low-side internal N-MOSFETs. Connect to the external inductor and to the boot capacitor return. |+| 2 | BOOT | power_in | Bootstrap supply for the high-side N-MOSFET gate driver. Connect a ceramic capacitor (typ. 0.1µF) from BOOT to SW to develop the floating gate-drive rail. |+| 3 | EN | input | Chip enable. Drive high (>2.0V) to enable the converter, low (<0.4V) to disable. On the EVB, EN is pulled to VIN via a 100kΩ resistor (R4) for auto-enable operation. |+| 4 | GND | power_in | Device ground. Also tied to the exposed thermal pad on the underside of the SOP-8 package; solder the exposed pad to a ground copper plane for thermal dissipation. |+| 5 | COMP | output | Error-amplifier output / loop compensation node. Connect an external RC network (typ. series R + C to GND) to set the loop bandwidth and phase margin of the current-mode control loop. |+| 6 | FB | input | Feedback input to the internal error amplifier. Connect to the midpoint of the R1/R2 divider between VOUT and GND. Reference voltage is 0.8V; VOUT = 0.8V x (1 + R1/R2). |+| 7 | RT | input | Oscillator frequency programming pin. Connect a resistor from RT to GND to set switching frequency between 300kHz and 1MHz (EVB uses 137kΩ / 113kΩ resistor on this pin). |+| 8 | VIN | power_in | Main input supply, 4.5V to 36V. Bypass to GND with low-ESR ceramic capacitors (EVB uses 2x 10µF/50V X5R plus 0.1µF) placed close to the pin. |+| 9 | EP (GND) | power_in | Exposed thermal pad on the bottom of the package. Electrically tied to GND (pin 4). Must be soldered to a GND copper pour for proper thermal performance. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Richtek Tech |+| Package | SOP-8-EP |+| Category | PMIC |+| Pins | 9 |++## Ordering variants++- `RT2872GSPGSP`++## CAD (KiCad official)++- Symbol: `RT2872GSP`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOP-8-EP (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Richtek Tech datasheet](docs/rt2872gsp-datasheet.pdf) (11 pp, sha256 `c32ddb3a6bfb0393`, 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/rt2872gsp-datasheet.pdf)

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