# LM2672MX-12

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

LM2672MX-12 from Texas Instruments, in a SOIC-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 | CB | input | Boot-strap capacitor connection for the high-side driver; connect a high quality 100-nF capacitor from CB to the VSW pin. |
| 2 | SS | input | Soft-start capacitor pin; connect a capacitor from this pin to GND to control the output voltage ramp. |
| 3 | SYNC | input | This input allows control of the switching clock frequency; if left open-circuited the regulator switches at the internal oscillator frequency, typically 260 kHz. |
| 4 | FB | input | Feedback sense input; connect to the midpoint of the feedback divider for the ADJ version, or connect directly to the output capacitor for a fixed output version. |
| 5 | ON/OFF | input | Enable input to the voltage regulator; high = ON and low = OFF, so pull this pin high or float it to enable the regulator. |
| 6 | GND | power_in | Power ground pin; connect to system ground, with the path to CIN kept as short as possible. |
| 7 | VIN | power_in | Supply input pin to the collector of the high-side FET; connect to the power supply and input bypass capacitor CIN, keeping the path to GND as short as possible. |
| 8 | VSW | output | Source pin of the internal high-side FET; this switching node attaches to the inductor and the cathode of the external diode. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-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 |
|---|---|---|---|---|---|---|---|
| Output voltage (12 V version, VIN 15 V to 40 V, ILOAD 20 mA to 1 A, TJ = 25°C) | VOUT | 11.82 | 12 | 12.18 | V | VIN = 15 V to 40 V, ILOAD = 20 mA to 1 A, TJ = 25°C | 5 |
| Output voltage (12 V version, TJ = -40°C to 125°C) | VOUT | 11.64 |  | 12.36 | V | VIN = 15 V to 40 V, ILOAD = 20 mA to 1 A, TJ = -40°C to 125°C | 5 |
| Quiescent current (12 V version) | IQ | 2.5 |  |  | mA | VFEEDBACK = 15 V for 12 V versions | 6 |
| Standby quiescent current (TJ = 25°C) | ISTBY |  | 50 | 100 | μA | ON/OFF Pin = 0 V, TJ = 25°C | 6 |
| Standby quiescent current (TJ = -40°C to 125°C) | ISTBY |  |  | 150 | μA | ON/OFF Pin = 0 V, TJ = -40°C to 125°C | 6 |
| Current limit (TJ = 25°C) | ICL | 1.25 | 1.55 | 2.1 | A |  | 6 |
| Current limit (TJ = -40°C to 125°C) | ICL | 1.2 |  | 2.2 | A |  | 6 |
| Output leakage current (VSWITCH = 0 V) | IL |  | 1 | 25 | μA | VSWITCH = 0 V, ON/OFF Pin = 0 V, VIN = 40 V | 6 |
| Output leakage current (VSWITCH = -1 V) | IL |  | 6 | 15 | mA | VSWITCH = -1 V, ON/OFF Pin = 0 V | 6 |
| Switch on-resistance (TJ = 25°C) | RDS(ON) |  | 0.25 | 0.3 | Ω | ISWITCH = 1 A, TJ = 25°C | 6 |
| Switch on-resistance (TJ = -40°C to 125°C) | RDS(ON) |  |  | 0.5 | Ω | ISWITCH = 1 A, TJ = -40°C to 125°C | 6 |
| Oscillator frequency (TJ = 25°C) | fO |  | 260 |  | kHz | Measured at switch pin, TJ = 25°C | 6 |
| Oscillator frequency (TJ = -40°C to 125°C) | fO | 225 |  | 275 | kHz | Measured at switch pin, TJ = -40°C to 125°C | 6 |
| Maximum duty cycle | D |  | 95 |  | % | TJ = 25°C | 6 |
| Minimum duty cycle | D |  | 0 |  | % | TJ = -40°C to 125°C | 6 |
| ON/OFF pin voltage (TJ = 25°C) | VS/D |  | 1.4 |  | V | TJ = 25°C | 6 |
| ON/OFF pin voltage (TJ = -40°C to 125°C) | VS/D | 0.8 |  | 2 | V | TJ = -40°C to 125°C | 6 |
| ON/OFF pin current (TJ = 25°C) | IS/D |  | 20 |  | μA | ON/OFF Pin = 0 V, TJ = 25°C | 6 |
| ON/OFF pin current (TJ = -40°C to 125°C) | IS/D | 7 |  | 37 | μA | ON/OFF Pin = 0 V, TJ = -40°C to 125°C | 6 |
| Synchronization frequency | FSYNC |  | 400 |  | kHz | VSYNC = 3.5 V, 50% duty cycle | 6 |
| Synchronization threshold voltage | VSYNC |  | 1.4 |  | V |  | 6 |
| Soft-start voltage (TJ = 25°C) | VSS |  | 0.63 |  | V | TJ = 25°C | 6 |
| Soft-start voltage (TJ = -40°C to 125°C) | VSS | 0.53 |  | 0.73 | V | TJ = -40°C to 125°C | 6 |
| Soft-start current (TJ = 25°C) | ISS |  | 4.5 |  | μA | TJ = 25°C | 6 |
| Soft-start current (TJ = -40°C to 125°C) | ISS | 1.5 |  | 6.9 | μA | TJ = -40°C to 125°C | 6 |
| Supply voltage |  |  |  | 45 | V | Over recommended operating junction temperature range of -40°C to 125°C | 4 |
| ON/OFF pin voltage, VSH | VSH | -0.1 |  | 6 | V | Over recommended operating junction temperature range of -40°C to 125°C | 4 |
| Switch voltage to ground |  | -1 |  |  | V | Over recommended operating junction temperature range of -40°C to 125°C | 4 |
| Boost pin voltage |  |  |  | 8 | V | VSW + 8 V; over recommended operating junction temperature range of -40°C to 125°C | 4 |
| Feedback pin voltage, VFB | VFB | -0.3 |  | 14 | V | Over recommended operating junction temperature range of -40°C to 125°C | 4 |
| Lead temperature, D package, vapor phase (60 s) |  |  |  | 215 | °C | Vapor phase (60s) | 4 |
| Lead temperature, D package, infrared (15 s) |  |  |  | 220 | °C | Infrared (15s) | 4 |
| Maximum junction temperature | TJ |  |  | 150 | °C |  | 4 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 4 |
| Supply voltage (recommended) |  | 6.5 |  | 40 | V | Over operating free-air temperature range | 4 |
| Operating junction temperature | TJ | -40 |  | 125 | °C | Operating junction temperature | 4 |
| Junction-to-ambient thermal resistance (D SOIC) | RθJA |  | 105 |  | °C/W | D (SOIC) package, 4-layer JEDEC board | 4 |

## CAD (KiCad official)

- Symbol: `LM2672MX-12`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `lm2672mx-12-etched.step` / `lm2672mx-12-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm2672mx-12.step` / `lm2672mx-12.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/lit/ds/symlink/lm2672.pdf) (39 pp, sha256 `4465557d2db983f5`, retrieved 2026-11-05, tier: manufacturer)
- **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/lm2672mx-12-datasheet.pdf)