# LM3477MMX

**Texas Instruments** · DC-DC Converters · VSSOP-8-0.65mm

LM3477MMX from Texas Instruments, in a VSSOP-8-0.65mm. 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 | ISEN | input | Current sense input pin; the voltage across the external sense resistor is fed into this pin, and the programmed current limit and hysteretic threshold depend on it. |
| 2 | COMP/SD | input | Compensation pin with an RC network for control-loop compensation, and pulling this pin below 0.65V shuts the device down. |
| 3 | FB | input | Feedback pin; the output voltage must be set with a resistor divider so that 1.270V appears at this pin. |
| 4 | GND | power_in | Ground pin. |
| 5 | SW | passive | Switch node that connects to the source of the external MOSFET and serves as the reference for the bootstrap capacitor on CB. |
| 6 | DR | output | Drive pin that connects to the gate of the external MOSFET. |
| 7 | CB | passive | Bootstrap pin; a capacitor must be connected between CB and SW (pin 5), and the voltage developed across it provides the gate drive for the external MOSFET. |
| 8 | VIN | power_in | Power supply input pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VSSOP-8-0.65mm |
| Category | Power Management (PMIC) |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `LM3477MMX`
- Footprint: `Package_SO:VSSOP-8_2.3x2mm_P0.5mm`
- 3D model: VSSOP-8-0.65mm (KiCad packages3D, STEP)
- 3D model files: `lm3477mmx-etched.step` / `lm3477mmx-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm3477mmx.step` / `lm3477mmx.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/lm3477) (36 pp, sha256 `e8ebe7c28eb86758`, retrieved 2026-10-11, tier: lcsc)
- **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/lm3477mmx-datasheet.pdf)