BD90640EFJ-CE2

@@ -0,0 +1,53 @@+# BD90640EFJ-CE2++**ROHM** · DC-DC Converters · ESOP-8++BD90640EFJ-CE2 from ROHM, in a ESOP-8. 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 | RT | passive | Switching frequency setting resistor connection. Connect resistor R_RT (22 kΩ-330 kΩ) from RT to GND to set f_SW between 50 kHz and 600 kHz (≈27 kΩ → 500 kHz). Internal reference on RT is ≈0.8 V. |+| 2 | SW | power_out | Switching output. Drain of the integrated P-ch Power MOSFET (R_ON 0.16 Ω typ). Connect to the external inductor / catch diode node. Rated 4 A max output switch current for BD90640; withstands the full V_IN swing. |+| 3 | EN/SYNC | input | Enable / external clock synchronization input. IC is enabled when V_EN/SYNC > 2.6 V (typ threshold 1.9 V) and shut down when < 0.8 V. Also accepts an external clock to synchronize the internal oscillator within ±20 % of the RT-programmed frequency. Absolute max V_EN/SYNC ≤ V_IN. |+| 4 | GND | power_in | Ground reference for the IC. The HTSOP-J8 exposed thermal pad (backside) is also tied to GND and must be soldered to the PCB ground copper for thermal dissipation (P_D = 3.10 W on recommended board). |+| 5 | VC | output | Error amplifier output / loop compensation node. Connect external R-C phase-compensation network from VC to GND. Internal source/sink currents ±54 µA typ; g_m ≈ 270 µA/V. Absolute max 7 V. |+| 6 | VIN | power_in | Power supply input to the control circuitry. Operating range 3.5 V to 36 V (initial startup > 3.9 V), absolute max 42 V. Must be shorted to PVIN (pin 7) externally per Note 1. |+| 7 | PVIN | power_in | Power stage supply input feeding the source of the integrated P-ch Power MOSFET. Must be tied to VIN (pin 6) externally. Bypass with a low-ESR ceramic capacitor (≥2.4 µF effective) close to the pin. |+| 8 | FB | input | Output voltage feedback input to the error amplifier. Regulated to V_REF = 0.800 V (±2 % over −40 °C to +125 °C). Set output voltage with a resistor divider from V_O to FB to GND. Input bias current ±1 µA max; absolute max 7 V. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | ROHM |+| Package | ESOP-8 |+| Category | PMIC |+| Pins | 8 |++## Ordering variants++Same part, different packaging or reel option.++- `BD90640EFJ-CE2`+- `BD90620EFJ-CE2`+- `BD90610EFJ-CE2`+- `BD90640HFP-C`+- `BD90620HFP-C`++## CAD (KiCad official)++- Symbol: `BD90640EFJ-CE2`+- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm`+- 3D model: ESOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [ROHM datasheet](docs/bd90640efj-ce2-datasheet.pdf) (43 pp, sha256 `94ffa542eb12f492`, 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/bd90640efj-ce2-datasheet.pdf)

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