# UC2844BD

**lingxingic** · AC-DC Controllers And Regulators · SOP-8

UC2844BD from lingxingic, in a SOP-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 and compensation node; the datasheet limits the error amplifier output sink current to 10 mA maximum. |
| 2 | VFB | input | Error amplifier inverting input (negative feedback); the analog input range is -0.3 V to +6.3 V and the input bias current is -2 µA maximum at VFB = 5 V. |
| 3 | ISENSE | input | Current-sense input to the PWM comparator, with a current-sense gain of 3 V/V (typ) and a maximum input signal of about 1 V (typ) at pin 1 = 5 V. |
| 4 | RT/CT | passive | Oscillator timing node where RT and CT set the switching frequency; for RT = 6.2 kΩ and CT = 1 nF the datasheet gives 225-275 kHz at 25 °C, with 1.6 V (typ) peak-to-peak oscillator amplitude. |
| 5 | GROUND | power_in | Ground reference for the control circuitry. |
| 6 | OUTPUT | output | Push-pull gate drive output for driving MOSFET power devices, rated for ±1 A output current. |
| 7 | Vi | power_in | Supply input, with an absolute maximum of 30 V from a low-impedance source; for the UC2844 the undervoltage lockout is 16 V turn-on and 10 V turn-off. |
| 8 | VREF | power_out | 5.0 V reference output (4.90 V to 5.10 V at Io = 1 mA, Tj = 25 °C), specified for load currents up to 20 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | lingxingic |
| Package | SOP-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `UC2844BD`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `uc2844bd-etched.step` / `uc2844bd-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `uc2844bd.step` / `uc2844bd.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [lingxingic datasheet](docs/uc2844bd-datasheet.pdf) (11 pp, sha256 `065498dc909cbc66`, retrieved 2026-10-22, 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/uc2844bd-datasheet.pdf)