bd9d320efj-e2

@@ -0,0 +1,48 @@+# BD9D320EFJ-E2++**ROHM** · DC-DC Converters · HTSOP-8-EP++BD9D320EFJ-E2 from ROHM, in a HTSOP-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 | EN | input | Enable input. Drive ≤0.3V to force shutdown; drive ≥2.2V to enable the device. Must not be left floating. |+| 2 | FB | input | Feedback input. Inverting input of the error comparator, compared against the internal 0.765V reference (VREF). Set VOUT via an external resistor divider from VOUT to FB to GND. |+| 3 | VREG | power_out | Internal 5.25V (Typ) LDO output used as the IC's control-circuit supply. Active when EN is above 2.2V. Bypass to GND with a 1µF ceramic capacitor. |+| 4 | SS | passive | Soft-start timing pin. Connect a capacitor to GND to set the output-voltage rise time during startup. |+| 5 | GND | power_in | Ground return for both the switching output stage and the internal control circuitry. |+| 6 | SW | output | Switch node. Connected to the source of the high-side MOSFET and drain of the low-side MOSFET. Connect the output inductor here (sized for the required DC current) and a 0.1µF bootstrap capacitor between SW and BOOT. |+| 7 | BOOT | passive | Bootstrap capacitor node. Connect a 0.1µF capacitor between BOOT and SW; this capacitor generates the gate-drive voltage for the high-side MOSFET (VBOOT-VSW = 4.5-5.5V recommended). |+| 8 | VIN | power_in | Power-supply input for the switching regulator. Recommended operating range 4.5V to 18V (20V absolute max). Bypass to GND with 20µF (10µF×2) plus 0.1µF ceramic capacitors close to the pin. |+| 9 | FIN | power_in | Exposed backside heat-dissipation pad. Connect to the internal PCB ground plane with multiple thermal vias for good heat dissipation. Electrically tied to GND. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | ROHM |+| Package | HTSOP-8-EP |+| Category | PMIC |+| Pins | 9 |++## Ordering variants++- `BD9D320EFJ-E2`++## CAD (KiCad official)++- Symbol: `BD9D320EFJ-E2`+- Footprint: `Package_SO:HTSOP-8-1EP_3.9x4.9mm_P1.27mm_EP2.4x3.2mm`+- 3D model: HTSOP-8-EP (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [ROHM datasheet](docs/bd9d320efj-e2-datasheet.pdf) (None pp, sha256 `be034a3b51edf91c`, 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/bd9d320efj-e2-datasheet.pdf)

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