# FM9920D

**Shenzhen Fuman** · AC-DC Controllers & Regulators · SOP-8

FM9920D from Shenzhen Fuman, in a SOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | GND | power_in | Source of the built-in synchronous rectifier MOSFET; pins 1, 2 and 3 must be connected together. |
| 2 | GND | power_in | Source of the built-in synchronous rectifier MOSFET; pins 1, 2 and 3 must be connected together. |
| 3 | GND | power_in | Chip ground; pins 1, 2 and 3 must be connected together. |
| 4 | VCC | power_in | Chip supply pin, charged from the output through the D pin; absolute maximum is -0.3 V to 7 V, start-up threshold 3.3 V and undervoltage lockout 2.9 V. |
| 5 | D | passive | Drain of the built-in synchronous rectifier MOSFET, absolute maximum -0.3 V to 45 V; it also supplies the chip operating current to VCC, and added copper area is recommended for heat dissipation. |
| 6 | D | passive | Drain of the built-in synchronous rectifier MOSFET, absolute maximum -0.3 V to 45 V; it also supplies the chip operating current to VCC, and added copper area is recommended for heat dissipation. |
| 7 | D | passive | Drain of the built-in synchronous rectifier MOSFET, absolute maximum -0.3 V to 45 V; it also supplies the chip operating current to VCC, and added copper area is recommended for heat dissipation. |
| 8 | D | passive | Drain of the built-in synchronous rectifier MOSFET, absolute maximum -0.3 V to 45 V; it also supplies the chip operating current to VCC, and added copper area is recommended for heat dissipation. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shenzhen Fuman |
| Package | SOP-8 |
| Category | Power Management ICs |
| Pins | 8 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Drain pin voltage D (absolute maximum) | D | -0.3 |  | 45 | V |  | 3 |
| Internal supply pin VCC (absolute maximum) | VCC | -0.3 |  | 7 | V |  | 3 |
| Operating junction temperature range TJ | TJ | -20 |  | 125 | ℃ |  | 3 |
| Storage temperature range TSTG | TSTG | -40 |  | 150 | ℃ |  | 3 |
| Soldering temperature |  |  |  | 260 | ℃ |  | 3 |
| ESD rating |  |  |  | 2 | KV | Human body model, 100pF discharged through 1.5kΩ (note 4) | 3 |
| Quiescent operating current | Iop |  | 180 |  | uA |  | 2 |
| VCC start-up threshold voltage | VCC_ON |  | 3.3 |  | V | VCC rising | 2 |
| VCC undervoltage lockout voltage | VCC_UVLO |  | 2.9 |  | V | VCC falling | 2 |
| Synchronous rectifier turn-on voltage threshold | SR_ON |  | -150 |  | mV |  | 2 |
| Synchronous rectifier turn-off voltage threshold | SR_OFF |  | -3 |  | mV |  | 2 |
| Power switch minimum on time | Ton_min |  | 1 |  | uS |  | 2 |
| Power switch minimum off time | Toff_min |  | 1 |  | uS |  | 2 |
| Power switch on-resistance RDS_ON | RDS_ON |  | 15 | 21 | mΩ | Vgs=10V Id=8A | 2 |
| Built-in power switch breakdown voltage | BVDSS |  | 45 |  | V | VGS=0V ID=250uA | 2 |

## CAD (KiCad official)

- Symbol: `FM9920D`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `fm9920d-etched.step` / `fm9920d-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `fm9920d.step` / `fm9920d.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Shenzhen Fuman datasheet](docs/fm9920d-datasheet.pdf) (4 pp, sha256 `d2f3bcf306fdf118`, retrieved 2026-10-28, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/fm9920d-datasheet.pdf)