# LM22678TJ-ADJ

**Texas Instruments** · DC-DC Converters · TO-263-7

LM22678TJ-ADJ from Texas Instruments, in a TO-263-7. 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 | Switching output of the regulator. |
| 2 | VIN | power_in | Supply input to the regulator. |
| 3 | BOOT | input | Bootstrap input that provides the gate voltage for the high-side NFET. |
| 4 | GND | power_in | Ground input to the regulator and system common, the system ground pin. |
| 5 | NC | unconnected | Not electrically connected inside the chip; the pin does function as a thermal conductor. |
| 6 | FB | input | Feedback input to the regulator. |
| 7 | EN | input | Enable input used to control regulator start-up and shutdown. |
| 8 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TO-263-7 |
| 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 |
|---|---|---|---|---|---|---|---|
| VFB Feedback Voltage | VFB | 1.266 | 1.285 | 1.304 | V | VIN = 4.7 V to 42 V | 5 |
| VFB Feedback Voltage over temperature | VFB | 1.259 |  | 1.311 | V | VIN = 4.7 V to 42 V, -40°C ≤ TJ ≤ 125°C | 5 |
| Input Supply Voltage | VIN | 4.5 |  | 42 | V |  | 4 |
| Junction Temperature Range | TJ | -40 |  | 125 | °C |  | 4 |
| Quiescent Current | IQ |  | 3.4 |  | mA | VFB = 5 V | 5 |
| Quiescent Current over temperature | IQ |  |  | 6 | mA | VFB = 5 V, -40°C ≤ TJ ≤ 125°C | 5 |
| Standby Quiescent Current | ISTDBY |  | 25 | 40 | µA | EN Pin = 0 V | 5 |
| Current Limit | ICL | 6 | 7.1 | 8.4 | A |  | 5 |
| Current Limit over temperature | ICL | 5.75 |  | 8.75 | A | -40°C ≤ TJ ≤ 125°C | 5 |
| Output Leakage Current | IL |  | 0.2 | 2 | µA | VIN = 42 V, EN Pin = 0 V, VSW = 0 V | 5 |
| Output Leakage Current | IL |  | 0.1 | 3 | µA | VSW = -1 V | 5 |
| Switch On-Resistance | RDS(ON) |  | 0.1 | 0.14 | Ω |  | 5 |
| Switch On-Resistance over temperature | RDS(ON) |  |  | 0.2 | Ω | -40°C ≤ TJ ≤ 125°C | 5 |
| Oscillator Frequency | fO |  | 500 |  | kHz |  | 5 |
| Oscillator Frequency over temperature | fO | 400 |  | 600 | kHz | -40°C ≤ TJ ≤ 125°C | 5 |
| Minimum Off-time | TOFFMIN |  | 200 |  | ns |  | 5 |
| Minimum Off-time over temperature | TOFFMIN | 100 |  | 300 | ns | -40°C ≤ TJ ≤ 125°C | 5 |
| Minimum On-time | TONMIN |  | 100 |  | ns |  | 5 |
| Feedback Bias Current | IBIAS |  | 230 |  | nA | VFB = 1.3 V (ADJ Version Only) | 5 |
| Enable Threshold Voltage (falling) | VEN |  | 1.6 |  | V | Falling | 5 |
| Enable Threshold Voltage (falling) over temperature | VEN | 1.3 |  | 1.9 | V | Falling, -40°C ≤ TJ ≤ 125°C | 5 |
| Enable Threshold Hysteresis | VENHYST |  | 0.6 |  | V |  | 5 |
| Enable Input Current | IEN |  | 6 |  | µA | EN Input = 0 V | 5 |
| Thermal Shutdown Threshold | TSD |  | 150 |  | °C |  | 5 |
| VIN to GND | VIN |  |  | 43 | V |  | 4 |
| EN Pin Voltage | VEN | -0.5 |  | 6 | V |  | 4 |
| SW to GND (dc) | VSW | -5 |  |  | V | dc voltage; VIN | 4 |
| BOOT Pin Voltage | VBOOT |  |  | 7 | V | VSW + 7 V | 4 |
| FB Pin Voltage | VFB | -0.5 |  | 7 | V |  | 4 |
| Junction Temperature | TJ |  |  | 150 | °C |  | 4 |
| Storage temperature range | Tstg | -65 |  | 150 | °C |  | 4 |
| Junction-to-ambient thermal resistance | RθJA |  | 22 |  | °C/W |  | 4 |

## CAD (KiCad official)

- Symbol: `LM22678TJ-ADJ`
- Footprint: `Package_TO_SOT_SMD:TO-263-7_TabPin8`
- 3D model: TO-263-7 (KiCad packages3D, STEP)
- 3D model files: `lm22678tj-adj-etched.step` / `lm22678tj-adj-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm22678tj-adj.step` / `lm22678tj-adj.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/lm22678.pdf) (29 pp, sha256 `15af02f36cd8d5ce`, 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/lm22678tj-adj-datasheet.pdf)