# DP2291

**Shenzhen Developer Microelec** · AC-DC Controllers & Regulators · SOT-23-6

DP2291 from Shenzhen Developer Microelec, in a SOT-23-6. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | GND | power_in | Ground reference of the IC. |
| 2 | FB | input | Feedback input for loop regulation via photo-coupler; PWM duty cycle determined by this pin voltage and current sense signal; voltage range -0.3 to 7 V, open voltage 4.5 to 6 V, input impedance 25 kOhm. |
| 3 | SEL | input | Mode selection input; connect external capacitor between SEL and GND for CC/CV mode or leave floating for CV mode only; voltage range -0.3 to 7 V. |
| 4 | CS | input | Current sense input pin with 250 ns leading edge blanking; current limiting threshold 0.97 to 1.03 V; voltage range -0.3 to 7 V. |
| 5 | VDD | power_in | Power supply input; operating range 10.5 to 28.5 V, UVLO exit 21 V typical, UVLO enter 9.3 V typical, OVP threshold 31.5 V typical. |
| 6 | GATE | output | Totem-pole gate driver output to drive external MOSFET; 400 mA capability, output low 1 V, output high 7.5 V at 20 mA, clamp voltage 16 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shenzhen Developer Microelec |
| Package | SOT-23-6 |
| Category | Power Supply Chip |
| Pins | 6 |

## CAD (KiCad official)

- Symbol: `DP2291`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files: `dp2291-etched.step` / `dp2291-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `dp2291.step` / `dp2291.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Shenzhen Developer Microelec datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590226438600630272) (14 pp, sha256 `5aa7724af457f485`, retrieved 2026-09-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (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/dp2291-datasheet.pdf)