# LM5009MM

**Texas Instruments** · DC-DC Converters · MSOP-8

LM5009MM from Texas Instruments, in a MSOP-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 | SW | output | Power switching output connected to inductor, recirculating diode, and bootstrap capacitor. |
| 2 | BST | input | Boost pin requiring external 0.022-µF ceramic capacitor between BST and SW pins, charged from VCC via internal diode. |
| 3 | RCL | input | Current limit off-time set pin with resistor to RTN; off-time preset to 35 µs when FB = 0 V. |
| 4 | RTN | power_in | Ground pin for the entire circuit. |
| 5 | FB | input | Feedback input from regulated output to inverting input of regulation comparator with 2.5 V threshold. |
| 6 | RON/SD | input | On-time set pin with resistor to VIN determining switch on-time (minimum 250 ns at maximum VIN), usable for remote shutdown. |
| 7 | VCC | power_out | Internal high-voltage startup regulator output regulated at 7.0 V (do not exceed 14 V) providing gate drive power; internal diode between this pin and BST; requires 0.1-µF decoupling capacitor. |
| 8 | VIN | power_in | Input voltage with recommended operating range 9.5 V to 95 V. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `LM5009MM`
- Footprint: `Package_SO:MSOP-8_3x3mm_P0.65mm`
- 3D model: MSOP-8 (KiCad packages3D, STEP)
- 3D model files: `lm5009mm-etched.step` / `lm5009mm-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm5009mm.step` / `lm5009mm.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/lm5009) (29 pp, sha256 `a24fc688849523e5`, retrieved 2026-10-03, 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-4-5-20251001` (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/lm5009mm-datasheet.pdf)