# LM1117MK-ADJ

**HGSEMI** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89-3

LM1117MK-ADJ from HGSEMI, in a SOT-89-3. 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 | GND/ADJ | power_in | Ground/adjust pin; on the ADJ version it sets the output voltage through the external divider, with adjust-pin current Iadj typically 60 µA and at most 120 µA. |
| 2 | VOUT | output | Regulated output voltage; the adjustable version requires an output capacitor of at least 22 µF tantalum for stability, and stability decreases as output current increases. |
| 3 | VIN | power_in | Input operating voltage; the recommended input voltage is 12 V maximum, and the absolute maximum input voltage is 15 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HGSEMI |
| Package | SOT-89-3 |
| Category | Power Management (PMIC) |
| Pins | 3 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Reference voltage (IOUT=10mA, VIN-VOUT=2V, TJ=25°C) | VREF | 1.231 | 1.25 | 1.268 | V | IOUT=10mA, VIN-VOUT=2V, TJ=25°C | 5 |
| Reference voltage (full range) | VREF | 1.225 | 1.25 | 1.275 | V | 10mA≤IOUT≤1A, 1.4V≤VIN-VOUT≤10V | 5 |
| Current limit | Ilimit | 2.1 |  | 2.5 | A |  | 5 |
| Ripple rejection ratio | PSRR | 60 | 75 |  | dB | fRIPPLE=120Hz, (VIN-VOUT)=3V, VRIPPLE=1VPP | 5 |
| Line regulation | Rline |  | 9 | 18 | mV | VINMIN ≤VIN≤ 12V, VOUT=Fixed/Adj, IOUT=10mA | 5 |
| Load regulation | Rload |  | 10 | 18 | mV | 10mA≤IOUT≤800mA, VOUT=Fixed/Adj | 5 |
| Dropout voltage at IOUT=100mA | Vdrop |  | 1 | 1.2 | V | IOUT=100mA | 5 |
| Dropout voltage at IOUT=500mA | Vdrop |  | 1.05 | 1.25 | V | IOUT=500mA | 5 |
| Dropout voltage at IOUT=800mA | Vdrop |  | 1.2 | 1.3 | V | IOUT=800mA | 5 |
| Quiescent current | Iq |  | 5 | 10 | mA | 4.25V≤VIN≤ 6.5V | 5 |
| Adjust pin current | Iadj |  | 60 | 120 | μA |  | 5 |
| Adjust pin current change | Iadj |  | 0.2 | 5 | μA | 0≤ IOUT≤800mA, 1.4V ≤VIN-VOUT≤10V | 5 |
| Input voltage (absolute maximum) | VIN |  |  | 15 | V |  | 4 |
| Lead temperature (soldering) | TLead |  |  | 260 | °C | soldering, 10 s | 4 |
| Operating junction temperature (absolute maximum) | TJ |  |  | 150 | °C |  | 4 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 4 |
| ESD capability (minimum value) | ESD | 2000 |  |  | V |  | 4 |
| Input voltage (recommended operating) | VIN |  |  | 12 | V |  | 4 |
| Operating junction temperature range (recommended) | TJ | -40 |  | 125 | °C |  | 4 |

## CAD (KiCad official)

- Symbol: `LM1117MK-ADJ`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89-3 (KiCad packages3D, STEP)
- 3D model files: `lm1117mk-adj-etched.step` / `lm1117mk-adj-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm1117mk-adj.step` / `lm1117mk-adj.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HGSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8757064084468707328) (10 pp, sha256 `14d5d7f5b1118842`, retrieved 2026-10-19, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/lm1117mk-adj-datasheet.pdf)