# EG3844

**EG Micro** · AC-DC Controllers And Regulators · SOP-8

EG3844 from EG Micro, 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 | FB | input | Feedback pin: the PWM duty cycle is set by the voltage on this pin together with the current-sense signal, with PWM gain 2.8 V/V, open-circuit voltage 5.3 V, power-limit threshold 4.6 V, and an absolute maximum of 6 V for FB. |
| 2 | nc | unconnected | No connection (floating); the datasheet states this pin is left open. |
| 3 | CS | input | Current-sense input that monitors the voltage across the external sense resistor for cycle-by-cycle current limiting, with a current-limit threshold Vcs(max) of 0.85 to 0.95 V (0.9 V typical), 250 ns leading-edge blanking, and an absolute maximum of 6 V. |
| 4 | RI | passive | Oscillator frequency-set pin: a resistor between RI and GND sets the switching frequency by Fosc(KHz) = 3640 / RI(KΩ) (60 to 70 kHz, 65 kHz typical at RI = 56 kΩ), with an absolute maximum of 6 V and open-circuit voltage 2 V. |
| 5 | GND | power_in | Chip ground. |
| 6 | OUT | output | Gate-drive output that drives the power MOSFET gate, with absolute range -0.3 V to VCC+0.3 V, low-level output at most 0.3 V at 20 mA sink, and high-level output 11 V at 20 mA source. |
| 7 | VCC | power_in | Supply pin: UVLO turn-on 15 to 17 V (16 V typical) and turn-off 9.5 to 11.5 V (10.5 V typical), overvoltage protection 20 to 25 V, absolute maximum 27 V, and zener clamp 26 to 28 V at 10 mA with a maximum clamp current of 10 mA. |
| 8 | REF | power_out | 5 V reference output with Vref of 4.9 to 5.5 V (5.2 V typical) and maximum output current 5 mA; the datasheet states this pin may be left floating. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `EG3844`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `eg3844-etched.step` / `eg3844-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `eg3844.step` / `eg3844.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [EG Micro datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588954583783100416) (11 pp, sha256 `9481152ff37b83b3`, retrieved 2026-10-10, 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/eg3844-datasheet.pdf)