# TMI3112H

**TMI** · DC-DC Converters · SOT-23-5

TMI3112H from TMI, in a SOT-23-5. 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 | EN | input | Chip enable pin: drive EN above 1.5V to turn the part on and below 0.4V to turn it off, and do not leave it floating. |
| 2 | GND | power_in | Ground pin for the device. |
| 3 | LX | output | Power switch output connected to the inductor; it ties to the drains of the internal P-ch and N-ch MOSFET switches. |
| 4 | IN | power_in | Power supply input pin; the recommended input voltage range is 2.7V to 5.5V. |
| 5 | FB | input | Output voltage feedback pin, used with external resistors R1 and R2 to program the output voltage (regulation as low as 0.6V). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TMI |
| Package | SOT-23-5 |
| Category | Power Management (PMIC) |
| Pins | 5 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Input Supply Voltage |  | -0.3 |  | 6.5 | V |  | 2 |
| LX Voltages |  | -0.3 |  | 6.5 | V |  | 2 |
| EN, FB Voltage |  | -0.3 |  | 6.5 | V |  | 2 |
| LX Voltage (<10ns transient) |  | -2.5 |  | 7 | V | <10ns transient | 2 |
| LX Voltage (<5ns transient) |  | -3.5 |  | 7.5 | V | <5ns transient | 2 |
| Storage Temperature Range |  | -65 |  | 150 | °C |  | 2 |
| Junction Temperature |  | -40 |  | 155 | °C | Note 2 | 2 |
| Power Dissipation |  |  |  | 650 | mW |  | 2 |
| Lead Temperature (Soldering) |  |  |  | 260 | °C | Soldering, 10s | 2 |
| Voltage Range IN |  | 2.7 |  | 5.5 | V |  | 3 |
| TJ Operating Junction Temperature Range | TJ | -40 |  | 125 | °C |  | 3 |
| Input Voltage Range |  | 2.7 |  | 5.5 | V |  | 4 |
| Input OVP Threshold |  | 5.75 | 5.85 | 6.1 | V | VIN rising | 4 |
| Quiescent Current |  |  | 40 | 100 | µA | VEN=2.0V, IOUT=0, VFB=VREF*105% | 4 |
| Shutdown Current |  |  | 0.1 | 1 | µA | VEN =0V | 4 |
| Feedback Voltage Accuracy |  | 0.588 | 0.6 | 0.612 | V | TA = 25°C, PWM Operation | 4 |
| EN Rising Threshold |  | 0.9 | 1.15 | 1.4 | V | VIN=5V | 4 |
| EN Falling Threshold |  | 0.75 | 1 | 1.25 | V | VIN=5V | 4 |
| Soft Start Time |  | 0.7 | 1 | 1.3 | ms |  | 4 |
| EN Leakage Current |  |  | 0.01 | 1 | µA |  | 4 |
| LX Leakage Current |  |  | 0.01 | 1 | µA | VEN=0V, VIN=VLX=5V | 4 |
| Junction-to-ambient thermal resistance | θJA |  | 200 |  | °C/W | JESD51-7, 4-layer PCB | 3 |
| Junction-to-case thermal resistance | θJC |  | 60 |  | °C/W |  | 3 |

## CAD (KiCad official)

- Symbol: `TMI3112H`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `tmi3112h-etched.step` / `tmi3112h-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tmi3112h.step` / `tmi3112h.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590445426811183104) (14 pp, sha256 `dd1872111c9d1030`, retrieved 2026-10-19, 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/tmi3112h-datasheet.pdf)