# STI3453

**TMI** · DC-DC Converters · SOT-563

STI3453 from TMI, in a SOT-563. 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 | IN | power_in | Power supply pin; the recommended input voltage range is 4.5 V to 18 V, and the absolute maximum input supply voltage is 20 V. |
| 2 | LX | power_out | Switching pin connected to the internal high-side and low-side power MOSFETs; LX voltage absolute maximum is -0.3 V to 20 V. |
| 3 | GND | power_in | Ground pin. |
| 4 | BS | power_out | Bootstrap pin; a capacitor connected between LX and BS is required to form a floating supply across the high-side switch driver, with BS voltage absolute maximum of -0.3 V to 23 V. |
| 5 | EN | input | Drive to logic-high to enable the IC and to logic-low to disable it into micro-power shutdown; do not leave floating, with EN rising threshold 0.85 V to 1.05 V and falling threshold 0.67 V to 0.87 V. |
| 6 | FB | input | Output voltage feedback input, connected to the center point of the external resistor divider; the regulated feedback voltage is 0.805 V typical, and the FB absolute maximum is 6 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TMI |
| Package | SOT-563 |
| Category | Power Management (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 |
|---|---|---|---|---|---|---|---|
| Input Supply Voltage, EN |  | -0.3 |  | 20 | V |  | 2 |
| LX Voltages |  | -0.3 |  | 20 | V |  | 2 |
| FB Voltage |  | -0.3 |  | 6 | V |  | 2 |
| BS Voltage |  | -0.3 |  | 23 | V |  | 2 |
| Storage Temperature Range |  | -65 |  | 150 | °C |  | 2 |
| Junction Temperature (Note 2) |  |  |  | 160 | °C |  | 2 |
| Power Dissipation |  |  |  | 1000 | mW |  | 2 |
| Lead Temperature (Soldering, 10s) |  |  |  | 260 | °C | Soldering, 10s | 2 |
| Voltage Range IN |  | 4.5 |  | 18 | V |  | 3 |
| TJ Operating Temperature Range | TJ | -40 |  | 125 | °C |  | 3 |
| Input Voltage Range |  | 4.5 |  | 18 | V |  | 4 |
| OVP Threshold |  | 18.7 | 19.3 | 19.8 | V |  | 4 |
| Shutdown Current |  |  | 5 | 10 | μA | VIN=12V, EN=0V | 4 |
| Regulated Feedback Voltage |  | 0.793 | 0.805 | 0.817 | V | TA=25°C, VIN=12V | 4 |
| High-Side Switch Leakage Current |  |  | 1 | 10 | μA | VEN=0V, VLX=0V | 4 |
| Switch Valley Current Limit |  | 3.7 | 4 | 4.5 | A |  | 4 |
| On Time |  | 90 | 120 | 160 | ns | VIN=12V, VOUT=1.2V, IOUT=1A | 4 |
| Oscillation Frequency |  | 900 | 1000 | 1100 | kHz |  | 4 |
| Soft Start Time |  | 0.7 | 1 | 1.3 | ms |  | 4 |
| EN Rising Threshold |  | 0.85 | 0.95 | 1.05 | V |  | 4 |
| EN Falling Threshold |  | 0.67 | 0.77 | 0.87 | V |  | 4 |
| Junction-to-ambient thermal resistance | θJA |  | 130 |  | °C/W |  | 3 |
| Junction-to-case(top) thermal resistance | θJC |  | 60 |  | °C/W |  | 3 |
| Junction-to-case(top) characterization parameter | ψJC |  | 3 |  | °C/W |  | 3 |
| UVLO Rising Threshold |  |  | 4.3 |  | V |  | 4 |
| UVLO Hysteresis |  |  | 0.35 |  | V |  | 4 |
| Quiescent Current |  |  | 300 |  | μA | VEN=2.0V, IOUT=0A, VFB=VREF x 105% | 4 |
| High-Side Switch On-Resistance |  |  | 70 |  | mΩ |  | 4 |
| Low-Side Switch On-Resistance |  |  | 35 |  | mΩ |  | 4 |
| Maximum Duty Cycle |  |  | 85 |  | % |  | 4 |
| Minimum On-Time (Note 4) |  |  | 60 |  | ns |  | 4 |
| Hiccup on Time (Note 4) |  |  | 1.2 |  | ms |  | 4 |
| Hiccup Time Before Restart |  |  | 3.6 |  | ms |  | 4 |
| EN Hysteresis |  |  | 180 |  | mV |  | 4 |
| Thermal Shutdown Threshold (Note 4) |  |  | 165 |  | °C |  | 4 |
| Thermal Shutdown Hysteresis (Note 4) |  |  | 30 |  | °C |  | 4 |

## CAD (KiCad official)

- Symbol: `STI3453`
- Footprint: `Package_TO_SOT_SMD:SOT-563`
- 3D model: SOT-563 (KiCad packages3D, STEP)
- 3D model files: `sti3453-etched.step` / `sti3453-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sti3453.step` / `sti3453.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/8590454860341673985) (15 pp, sha256 `5b44ca2afcd16ee1`, retrieved 2026-10-20, 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/sti3453-datasheet.pdf)