SSP9451

@@ -0,0 +1,45 @@+# SSP9451++**Shanghai Siproin Microelectronics** · DC-DC Converters · SOT-23-6++SSP9451 from Shanghai Siproin Microelectronics, 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 | BST | passive | Bootstrap. Positive supply for the internal floating high-side MOSFET driver. Connect a bypass capacitor between this pin and SW; the internal bootstrap regulator holds this rail ~5V above SW (BST-to-SW absolute max 6.0V). |+| 2 | GND | power_in | Ground return. Should be connected as close as possible to the output capacitor to avoid high-current switching paths. |+| 3 | FB | input | Feedback input to the error amplifier. An external resistive divider from VOUT to GND is compared to the internal 0.794V (typ) reference to set the regulation voltage. |+| 4 | EN | input | Enable input. Pull above the enable threshold (Venh 1.6V min, 2.0V max) to enable; pull below to disable. Internally pulled to ground when floating; internally clamped to ~7.5V. Connect a 100kΩ resistor to VIN to auto-enable. |+| 5 | VIN | power_in | Input supply, 4.2V to 40V operating (absolute max 43V). Powers all internal control circuits and the high-side switching MOSFET. Requires a decoupling capacitor to GND placed close to this pin to reduce switching spikes. |+| 6 | SW | output | Switch node - output of the internal high-side MOSFET drain. Connect the inductor here and a low-VF Schottky catch diode to GND close to this pin. Absolute max VSW = VIN(MAX)+0.3V. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Shanghai Siproin Microelectronics |+| Package | SOT-23-6 |+| Category | PMIC |+| Pins | 6 |++## Ordering variants++- `SSP9451`++## CAD (KiCad official)++- Symbol: `SSP9451`+- 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:** [Shanghai Siproin Microelectronics datasheet](docs/ssp9451-datasheet.pdf) (13 pp, sha256 `7829d7b5652b6515`, 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/ssp9451-datasheet.pdf)

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