BD9B400MUV-E2

@@ -0,0 +1,58 @@+# BD9B400MUV-E2++**ROHM** · DC-DC Converters · VQFN-16-EP(3x3)++BD9B400MUV-E2 from ROHM, in a VQFN-16-EP(3x3). 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 | PVIN | power_in | Power supply input to the switching regulator output stage (2.7 V to 5.5 V). Tied in parallel with pin 2. Requires a 22µF ceramic bypass capacitor. |+| 2 | PVIN | power_in | Power supply input to the switching regulator output stage (2.7 V to 5.5 V). Tied in parallel with pin 1. |+| 3 | PGND | power_in | Power ground for the switching regulator output stage. Tied in parallel with pin 4. |+| 4 | PGND | power_in | Power ground for the switching regulator output stage. Tied in parallel with pin 3. |+| 5 | AGND | power_in | Analog ground for the control circuit. Kelvin-connect to PGND at a single point. |+| 6 | FB | input | Feedback input, the inverting input to the error amplifier and main comparator. Regulates to VFB = 0.8 V (typ, 0.792-0.808 V) via an external resistor divider from VOUT. |+| 7 | FREQ | input | Switching-frequency select. Tie to GND for constant on-time corresponding to 2 MHz; tie to AVIN for 1 MHz. Must be fixed to AVIN or ground in operation. |+| 8 | MODE | input | Switching-control mode select. Tie to AVIN for fixed-frequency PWM; tie to GND to enable Deep-SLLM auto mode (auto switching between Deep-SLLM and fixed PWM). Must be fixed to AVIN or ground in operation. |+| 9 | SS | passive | Soft-start timing. Connect a capacitor to GND to set the output-voltage rise time; internal soft-start current ISS ≈ 1 µA (typ). Internal soft-start defaults to 1 ms (typ) when SS is open. |+| 10 | SW | power_out | Switch node - source of the high-side MOSFET and drain of the low-side MOSFET. Pins 10, 11, 12 are internally connected; connect the output inductor here (0.47µH-1µH for FREQ=L, 1µH-1.5µH for FREQ=H). |+| 11 | SW | power_out | Switch node (paralleled with pins 10 and 12). |+| 12 | SW | power_out | Switch node (paralleled with pins 10 and 11). A 0.1µF bootstrap capacitor between SW and BOOT is required. |+| 13 | BOOT | passive | Bootstrap capacitor node for the high-side MOSFET gate drive. Connect a 0.1µF ceramic capacitor between BOOT and SW; V(BOOT-SW) is the high-side gate-drive supply (~5 V). |+| 14 | PGD | output | Power-Good open-drain output. Requires an external pull-up resistor. Goes high-Z (High) when VFB exceeds 80% of 0.8 V; RPGD ≈ 100 Ω (typ), max sink 1 mA gives VOL ≈ 0.1 V. |+| 15 | EN | input | Enable input. Drive Low (≤0.8 V) to enter shutdown; drive High (≥2.0 V) to enable the device. IEN ≈ 5 µA @ EN=5V. Must be terminated (no internal pull). |+| 16 | AVIN | power_in | Analog/control-circuit supply (2.7 V to 5.5 V). Must be connected to PVIN. A 0.1µF ceramic bypass capacitor is recommended. |+| 17 | E-Pad | power_in | Backside exposed thermal pad. Connect to the internal PCB ground plane with multiple thermal vias for heat dissipation. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | ROHM |+| Package | VQFN-16-EP(3x3) |+| Category | PMIC |+| Pins | 17 |++## Ordering variants++Same part, different packaging or reel option.++- `BD9B400MUV-E2`++## CAD (KiCad official)++- Symbol: `BD9B400MUV-E2`+- Footprint: `Package_DFN_QFN:QFN-16-1EP_3x3mm_P0.5mm_EP1.7x1.7mm`+- 3D model: VQFN-16-EP(3x3) (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [ROHM datasheet](docs/bd9b400muv-e2-datasheet.pdf) (33 pp, sha256 `775e756d99121154`, 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/bd9b400muv-e2-datasheet.pdf)

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