# LP3996SD-3333

**Texas Instruments** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · WSON-10-EP(3x3)

LP3996SD-3333 from Texas Instruments, in a WSON-10-EP(3x3). 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 | VIN | power_in | Voltage Supply Input operating from 2.0V to 6.0V; requires 1 µF input capacitor to GND. |
| 2 | EN1 | input | Active-high enable input for Regulator 1; high enables output, low disables output. |
| 3 | EN2 | input | Active-high enable input for Regulator 2; high enables output, low disables output. |
| 4 | CBYP | passive | Internal voltage reference bypass pin; connect 10nF capacitor to GND for noise reduction and improved transient response, or leave open. |
| 5 | SET | passive | Programmable delay input for POR output; connect capacitor to GND to set delay time, or leave open for no delay. |
| 6 | GND | power_in | Common ground pin connected to exposed thermal pad. |
| 7 | N/C | unconnected | No connection pin; must remain unconnected. |
| 8 | POR | tri_state | Open-drain power-on-reset output, active low when VOUT2 falls below 90% of nominal; requires external pull-up resistor. |
| 9 | VOUT2 | power_out | Regulated output of 3.3V from Regulator 2 supplying up to 300 mA; requires 1 µF output capacitor to GND. |
| 10 | VOUT1 | power_out | Regulated output of 3.3V from Regulator 1 supplying up to 150 mA; requires 1 µF output capacitor to GND. |
| 11 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | WSON-10-EP(3x3) |
| Category | Power Management (PMIC) |
| Pins | 11 |

## CAD (KiCad official)

- Symbol: `LP3996SD-3333`
- Footprint: `Package_SON:VSON-10-1EP_3x3mm_P0.5mm_EP1.2x2mm`
- 3D model: WSON-10-EP(3x3) (KiCad packages3D, STEP)
- 3D model files: `lp3996sd-3333-etched.step` / `lp3996sd-3333-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lp3996sd-3333.step` / `lp3996sd-3333.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/lp3996) (21 pp, sha256 `9eba5b9befe97347`, retrieved 2026-10-03, tier: lcsc)
- **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/lp3996sd-3333-datasheet.pdf)