# FM3450C

**Shenzhen Fuman** · Battery Management · SOP-8

FM3450C 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 | VCC | power_in | Chip power supply pin, with an operating supply range of 3 V to 15 V and an absolute maximum rating of VSS-0.3 V to VSS+26 V. |
| 2 | V3 | input | Positive terminal of the third cell for voltage sensing, with an absolute maximum input range of V2-0.3 V to V2+5 V. |
| 3 | V2 | input | Negative terminal of the third cell and positive terminal of the second cell for voltage sensing, with an absolute maximum input range of V1-0.3 V to V1+5 V. |
| 4 | V1 | input | Negative terminal of the second cell and positive terminal of the first cell for voltage sensing, with an absolute maximum input range of VSS-0.3 V to VSS+5 V. |
| 5 | GND | power_in | Negative terminal of the first cell and the chip ground reference; the chip's supply current (typically 8 µA, maximum 15 µA at +25 °C) flows out of this pin. |
| 6 | VM | input | Current detection, load detection and charger detection pin for the overcurrent comparators, with an absolute maximum input range of VSS-0.3 V to VCC+0.3 V. |
| 7 | DO | output | Gate drive for the discharge-control NMOSFET as a CMOS output, with an absolute maximum voltage of VSS-0.3 V to VCC+0.3 V. |
| 8 | CO | output | Gate drive for the charge-control NMOSFET, giving a high-level or high-impedance output, with an absolute maximum voltage of VCC-26 V to VCC+0.3 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shenzhen Fuman |
| Package | SOP-8 |
| Category | Power Management (PMIC) |
| 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 |
|---|---|---|---|---|---|---|---|
| Overcharge detection voltage | VCU | -0.025 | 4.25 | 0.025 | V | n=1, 2, 3 | 2 |
| Overcharge release voltage | VCL | -0.08 | 4.05 | 0.08 | V | n=1, 2, 3 | 2 |
| Overdischarge detection voltage | VDL | -0.08 | 2.7 | 0.08 | V | n=1, 2, 3 | 2 |
| Overdischarge release voltage | VDU | -0.1 | 3 | 0.1 | V | n=1, 2, 3 | 2 |
| Overcurrent detection voltage 1 | VIOV1 | -0.01 | 0.1 | 0.01 | V |  | 2 |
| Overcurrent detection voltage 2 | VIOV2 | 0.15 | 0.2 | 0.25 | V |  | 3 |
| Overcurrent detection voltage 3 | VIOV3 | 0.35 | 0.45 | 0.55 | V |  | 3 |
| Overcharge detection delay time | tCU | 0.5 | 1.2 | 1.7 | s |  | 3 |
| Overcharge release detection delay time | tCUR | 0.5 | 1.2 | 1.7 | s |  | 3 |
| Overdischarge detection delay time | tDL | 0.5 | 1.2 | 1.7 | s |  | 3 |
| Overdischarge release detection delay time | tDLR | 0.5 | 1.2 | 1.7 | s |  | 3 |
| Overcurrent detection delay time 1 | tIOV1 | 0.5 | 1.2 | 1.7 | s |  | 3 |
| Overcurrent detection delay time 2 | tIOV2 | 60 | 144 | 200 | ms |  | 3 |
| Overcurrent detection delay time 3 | tIOV3 | 100 | 200 | 500 | μs |  | 3 |
| Overcurrent release detection delay time | tIOVR | 140 | 300 | 400 | ms |  | 3 |
| Current consumption | IOPE |  | 8 | 15 | μA | 从 GND 流出的电流 | 3 |
| CO drive current - MOS on | ICOH | 0.7 | 1.3 | 2 | mA |  | 3 |
| DO drive current capability | IDOH |  | 0.5 | 1 | mA | VDO = VVCC-3 V | 3 |
| DO sink current capability | IDOL | 1 | 2 | 3 | mA | VDO = VSS+3 V | 4 |
| V1 input voltage | V1 | -0.3 |  | 5 | V | Relative to VSS (VSS−0.3 ~ VSS+5) | 3 |
| V2 input voltage | V2 | -0.3 |  | 5 | V | Relative to V1 (V1−0.3 ~ V1+5) | 3 |
| V3 input voltage | V3 | -0.3 |  | 5 | V | Relative to V2 (V2−0.3 ~ V2+5) | 3 |
| Power supply terminal voltage | VCC | -0.3 |  | 26 | V | Relative to VSS (VSS−0.3 ~ VSS+26) | 3 |
| VM input terminal voltage | VVM | -0.3 |  | 0.3 | V | Min relative to VSS; max relative to VCC (VSS−0.3 ~ VCC+0.3) | 3 |
| DO output terminal voltage | VDO | -0.3 |  | 0.3 | V | Min relative to VSS; max relative to VCC (VSS−0.3 ~ VCC+0.3) | 3 |
| CO output terminal voltage | VCO | -26 |  | 0.3 | V | Relative to VCC (VCC−26 ~ VCC+0.3) | 3 |
| Permissible power dissipation | PD |  |  | 150 | mW |  | 3 |
| Operating ambient temperature | Topr | -40 |  | 85 | °C |  | 3 |
| Storage ambient temperature | Tstg | -40 |  | 125 | °C |  | 3 |
| Operating voltage range |  | 3 |  | 15 | V | 宽工作电压范围 | 1 |

## CAD (KiCad official)

- Symbol: `FM3450C`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `fm3450c-etched.step` / `fm3450c-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `fm3450c.step` / `fm3450c.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Shenzhen Fuman datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588946053118353408) (6 pp, sha256 `b817d43c24e936e0`, retrieved 2026-10-18, 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/fm3450c-datasheet.pdf)