# UCC28C44D

**Texas Instruments** · AC-DC Controllers And Regulators · SOIC-8

UCC28C44D from Texas Instruments, 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 | COMP | output | Error amplifier output with internal current limiting; force to ground to set zero duty cycle. |
| 2 | FB | input | Feedback input to error amplifier with internal 2.5V±1% reference for output voltage control. |
| 3 | CS | input | Current sense input to PWM comparator connected to primary-side current sense resistor. |
| 4 | RT/CT | bidirectional | Oscillator timing node connected to timing resistor RRT and capacitor CCT for frequency programming up to 1MHz. |
| 5 | GND | power_in | Ground return for output driver and logic control circuits. |
| 6 | OUT | output | Totem-pole output driver providing ±1A peak current for MOSFET gate drive with 25ns rise time and 20ns fall time. |
| 7 | VDD | power_in | Analog controller bias supply input with 20V absolute maximum; requires 0.1µF ceramic bypass capacitor to ground. |
| 8 | VREF | power_out | 5V reference voltage output with ±1% initial accuracy; requires 0.1µF ceramic bypass capacitor close to pin for stability. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `UCC28C44D`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `ucc28c44d-etched.step` / `ucc28c44d-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ucc28c44d.step` / `ucc28c44d.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/ucc28c43) (60 pp, sha256 `96c53984cf7d699f`, retrieved 2026-10-05, 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-4-5-20251001` (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/ucc28c44d-datasheet.pdf)