component
bd9d320efj-e2
Public Unreviewedby Ray
ROHM DC-DC Converters, HTSOP-8-EP. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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README
markdownBD9D320EFJ-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 (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).