# MT36291

**Aerosemi** · DC-DC Converters · SOT-23-6

MT36291 from Aerosemi, in a SOT-23-6. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | SW | power_out | Power Switch Output. Drain of the internal 80mΩ N-channel power MOSFET. Connect the boost inductor and the Schottky output rectifier here. SW node can swing between GND and 22V. |
| 2 | GND | power_in | Ground pin. Connect to a solid ground plane for heat sinking and noise protection. |
| 3 | FB | input | Feedback input to the internal error amplifier. Regulated to the 0.6V internal bandgap reference. Connect an external resistor divider from VOUT to FB to GND to set the output voltage: VOUT = 0.6V x (1 + R1/R2). FB input bias current is typically -10nA. |
| 4 | EN | input | Regulator On/Off Control Input. Drive high (>1.5V) to enable the converter, low (<0.6V) to shut it down (shutdown current ~0.1µA). Tie to VIN for automatic startup. Absolute max 18V. |
| 5 | VIN | power_in | Input supply pin, 2.2V to 16V operating range (18V absolute max). Must be locally bypassed with a low-ESR ceramic capacitor (22µF X5R/X7R recommended) placed close to the IC. |
| 6 | OC | input | Adjustable peak switch current limit. Connect a resistor (19kΩ to 96kΩ) from OC to GND to program the current limit from 2.5A down to 0.5A per IOCP = 48000/R. Leave floating to use the internal 2.5A default current limit. Keep trace short. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Aerosemi |
| Package | SOT-23-6 |
| Category | PMIC |
| Pins | 6 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Operating Input Voltage |  | 2.2 |  | 16 | V |  | 3 |
| FB Voltage |  | 0.588 | 0.6 | 0.612 | V |  | 3 |
| Adjustable OCP Current |  | 0.5 |  | 2.5 | A | With External Resistor:19k~96k | 3 |
| SW On Resistance |  |  | 80 | 150 | mΩ |  | 3 |
| SW Leakage |  |  |  | 1 | µA | VSW = 20V | 3 |
| FB Input Bias Current |  | -50 | -10 |  | nA | VFB = 0.6V | 3 |
| Quiescent Current (PFM) |  |  | 100 | 200 | µA | VFB=0.7V，No switch | 3 |
| Quiescent Current (PWM) |  |  | 1.6 | 2.2 | mA | VFB=0.5V，switch | 3 |
| Current (Shutdown) |  |  | 0.1 | 1 | µA | VEN= 0V | 3 |
| VIN, EN voltages | VIN, EN | -0.3 |  | 18 | V |  | 2 |
| FB Voltages | FB | -0.3 |  | 6 | V |  | 2 |
| SW Voltage | SW | -0.3 |  | 22 | V |  | 2 |
| Power Dissipation |  |  |  | 0.6 | W |  | 2 |
| Junction Temperature | TJ |  |  | 160 | °C |  | 2 |
| Operating Temperature Range | TA | -40 |  | 85 | °C |  | 2 |
| Storage Temperature Range |  | -65 |  | 150 | °C |  | 2 |
| ESD HBM (Human Body Mode) |  |  |  | 2 | kV | Human Body Mode | 2 |
| ESD MM (Machine Mode) |  |  |  | 200 | V | Machine Mode | 2 |
| Thermal Resistance θJC | θJC |  | 130 |  | °C/W |  | 2 |
| Thermal Resistance θJA | θJA |  | 250 |  | °C/W |  | 2 |

## CAD (KiCad official)

- Symbol: `MT36291`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files: `mt36291-etched.step` / `mt36291-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mt36291.step` / `mt36291.glb` are the bare package body.

## 3D model downloads

Two STEP files. Same geometry, different body top:

| File | Size | Use it when |
|---|---|---|
| [`mt36291.step`](mt36291.step) | 97 KB | You want the bare part, or you mark your own boards. |
| [`mt36291-etched.step`](mt36291-etched.step) | 1.6 MB | You want the part with `MT36291` already on it. |

The marking in the etched file is real recessed geometry cut into the solid, not a
texture or a decal: 385 faces against 117 in the bare model. It
survives export, section views, and rendering in any CAD tool, and it drops straight
into KiCad or Fusion with no extra setup.

## Provenance

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

- **Datasheet:** [Aerosemi datasheet](docs/mt36291-datasheet.pdf) (9 pp, sha256 `863d456e8ebecc44`, retrieved 2026-08-17, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/mt36291-datasheet.pdf)