# AOZ1212AI

**Alpha Omega Semicon** · DC-DC Converters · SOIC-8

AOZ1212AI from Alpha Omega Semicon, 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 | LX | output | PWM output connection to the inductor, which must be connected externally; it also serves as the thermal connection for the output stage. |
| 2 | BST | passive | Bootstrap voltage input for the high-side driver supply, connected through a 0.1µF capacitor between BST and LX. |
| 3 | GND | power_in | Ground reference; the input capacitor and output capacitor should connect to this pin. |
| 4 | FB | input | Feedback input regulated to 0.8V, with the output voltage set by a resistor divider between the output and GND. |
| 5 | COMP | passive | External loop compensation and output of the internal error amplifier; a series RC network connects from this pin to GND. |
| 6 | EN | input | Active-HIGH enable that must be above 2.5V to enable the device and below 0.6V to disable it, and must not be left floating. |
| 7 | VIN | power_in | Supply voltage input with a range of 4.5V to 27V; all VIN pins must be connected externally. |
| 8 | VBIAS | power_out | Compensation pin of the internal linear regulator, which requires a 1µF capacitor between this pin and ground. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Alpha Omega Semicon |
| 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 |
|---|---|---|---|---|---|---|---|
| Supply Voltage (VIN) | VIN | 4.5 |  | 27 | V |  | 3 |
| Output Voltage Range | VOUT | 0.8 |  |  | V | Printed max is 0.85*VIN | 3 |
| Ambient Temperature (TA) | TA | -40 |  | 85 | °C |  | 3 |
| Supply Voltage (VIN) | VIN |  |  | 30 | V |  | 3 |
| LX to GND | VLX | -0.7 |  |  | V | Printed max is VIN+0.3V | 3 |
| EN to GND | VEN | -0.3 |  |  | V | Printed max is VIN+0.3V | 3 |
| FB to GND | VFB | -0.3 |  | 6 | V |  | 3 |
| COMP to GND | VCOMP | -0.3 |  | 6 | V |  | 3 |
| VBIAS to GND | VBIAS | -0.3 |  | 6 | V |  | 3 |
| Junction Temperature (TJ) | TJ |  |  | 150 | °C |  | 3 |
| Storage Temperature (TS) | TS | -65 |  | 150 | °C |  | 3 |
| ESD Rating: Human Body Model |  |  |  | 2 | kV | Human body model, 1.5kΩ in series with 100pF | 3 |
| Package Thermal Resistance (ΘJA) SO-8 | ΘJA |  | 105 |  | °C/W | SO-8; 1-in2 FR-4 board, 2oz copper, still air, TA = 25°C | 3 |
| Supply Voltage (VIN) | VIN | 4.5 |  | 27 | V |  | 4 |
| Input Under-Voltage Lockout Threshold (rising) | VUVLO |  | 4.3 |  | V | VIN Rising | 4 |
| Input Under-Voltage Lockout Threshold (falling) | VUVLO |  | 4.1 |  | V | VIN Falling | 4 |
| Supply Current (Quiescent) | IIN |  | 2 | 3 | mA | IOUT = 0, VFB = 1.2V, VEN > 2V | 4 |
| Shutdown Supply Current | IOFF |  | 3 | 20 | µA | VEN = 0V | 4 |
| Feedback Voltage | VFB | 0.782 | 0.8 | 0.818 | V |  | 4 |
| Load Regulation |  |  | 0.5 |  | % |  | 4 |
| Line Regulation |  |  | 0.08 |  | % / V |  | 4 |
| Feedback Voltage Input Current | IFB |  | 200 |  | nA |  | 4 |
| EN Input Threshold On | VEN | 2.5 |  |  | V |  | 4 |
| EN Input Threshold Off | VEN |  |  | 0.6 | V |  | 4 |
| EN Input Hysteresis | VHYS |  | 200 |  | mV |  | 4 |
| Enable Sink/Source Current | IEN |  | 50 |  | nA |  | 4 |
| Frequency | fO | 315 | 370 | 425 | kHz |  | 4 |
| Maximum Duty Cycle | DMAX |  |  | 85 | % |  | 4 |
| Minimum Duty Cycle | DMIN | 6 |  |  | % |  | 4 |
| Error Amplifier Voltage Gain | GVEA |  | 500 |  | V / V |  | 4 |
| Error Amplifier Transconductance | GEA |  | 200 |  | µA / V |  | 4 |
| Current Limit | ILIM | 4 |  | 6 | A |  | 4 |
| Over-Temperature Shutdown Limit (TJ rising) |  |  | 145 |  | °C | TJ Rising | 4 |
| Over-Temperature Shutdown Limit (TJ falling) |  |  | 100 |  | °C | TJ Falling | 4 |
| Short Circuit Hiccup Frequency | fSC |  | 24 |  | kHz | VFB = 0V | 4 |
| Soft Start Interval | tSS |  | 6 |  | ms |  | 4 |
| High-Side Switch On-Resistance | RDS(ON) |  | 70 | 100 | mΩ |  | 4 |
| High-Side Switch Leakage |  |  | 10 |  | µA | VEN = 0V, VLX = 0V | 4 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | copper |  | the GND pin. Pour a maximized copper area to the | 11 |

## CAD (KiCad official)

- Symbol: `AOZ1212AI`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `aoz1212ai-etched.step` / `aoz1212ai-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `aoz1212ai.step` / `aoz1212ai.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Alpha Omega Semicon datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586183415342747648) (18 pp, sha256 `30689d8f07a2ef79`, retrieved 2026-10-18, 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/aoz1212ai-datasheet.pdf)