# UCC28C41DGKR

**Texas Instruments** · DC-DC Converters · VSSOP-8-0.65mm

UCC28C41DGKR from Texas Instruments, in a VSSOP-8-0.65mm. 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 for compensation, internally current limited so zero duty cycle can be commanded by forcing COMP to GND; error amplifier sink current is rated 10 mA maximum. |
| 2 | FB | input | Inverting input of the error amplifier, with the noninverting reference internally trimmed to 2.5 V ±1%. |
| 3 | CS | input | Primary-side current-sense input to the PWM comparator, connected to the MOSFET source sense resistor; analog input is rated -0.3 V to 6.3 V. |
| 4 | RT/CT | bidirectional | Oscillator set point, with timing resistor RRT connected to VREF and timing capacitor CCT connected to GND; analog input is rated -0.3 V to 6.3 V. |
| 5 | GND | power_in | Ground return pin for the output driver stage and the logic-level controller section; all voltages are referenced to this pin. |
| 6 | OUT | output | Totem-pole drive output for directly driving a MOSFET, sourcing and sinking up to 1 A peak; on the UCCx8C41 its frequency is half the oscillator frequency, limiting duty cycle to less than 50%, and it is held low when VDD is below turn-on, with a rating of -0.3 V to 20 V. |
| 7 | VDD | power_in | Analog controller bias supply input with an absolute maximum of 20 V and no internal clamp, requiring a 0.1 µF ceramic bypass to GND placed directly at the pin. |
| 8 | VREF | power_in | 5 V reference output with ±1% tolerance, requiring a minimum 0.1 µF ceramic bypass to GND placed close to the pin, and a short-circuit current of 55 mA maximum. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VSSOP-8-0.65mm |
| Category | Power Management (PMIC) |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `UCC28C41DGKR`
- Footprint: `Package_SO:VSSOP-8_2.3x2mm_P0.5mm`
- 3D model: VSSOP-8-0.65mm (KiCad packages3D, STEP)
- 3D model files: `ucc28c41dgkr-etched.step` / `ucc28c41dgkr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ucc28c41dgkr.step` / `ucc28c41dgkr.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/lit/ds/symlink/ucc28c41.pdf) (60 pp, sha256 `9fa55f996731c56b`, retrieved 2026-10-11, tier: manufacturer)
- **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/ucc28c41dgkr-datasheet.pdf)