# UC3825ADWTR

**Texas Instruments** · DC-DC Converters · SOIC-16-300mil

UC3825ADWTR from Texas Instruments, in a SOIC-16-300mil. 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 | INV | input | Inverting input to the error amplifier. |
| 2 | NI | input | Non-inverting input to the error amplifier. |
| 3 | EAOUT | output | Output of the error amplifier, used for loop compensation. |
| 4 | CLK/LEB | output | Output of the internal oscillator; a capacitor on this pin programs the leading edge blanking period, and the pin no longer accepts an incoming synchronizing signal. |
| 5 | RT | input | Timing resistor connection pin for oscillator frequency programming. |
| 6 | CT | input | Timing capacitor connection pin for oscillator frequency programming; it should be connected to device ground using minimal trace length. |
| 7 | RAMP | input | Non-inverting input to the PWM comparator with a 1.25-V internal input offset; it serves as voltage-mode feed-forward input or as the slope compensation input in peak current mode. |
| 8 | SS | input | Soft-start input pin which also doubles as the maximum duty cycle clamp. |
| 9 | ILIM | input | Input to the current limit comparator. |
| 10 | GND | power_in | Analog ground return pin. |
| 11 | OUTA | output | High current totem pole output A of the on-chip drive stage. |
| 12 | PGND | power_in | Ground return pin for the output driver stage. |
| 13 | VC | power_in | Power supply pin for the output stage; bypass with a 0.1-μF monolithic ceramic low ESL capacitor with minimal trace lengths. |
| 14 | OUTB | output | High current totem pole output B of the on-chip drive stage. |
| 15 | VCC | power_in | Power supply pin for the device; bypass with a 0.1-μF monolithic ceramic low ESL capacitor with minimal trace lengths. |
| 16 | VREF | power_in | 5.1-V reference output; bypass with a 0.1-μF monolithic ceramic low ESL capacitor with minimal trace length to the ground plane for stability. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16-300mil |
| Category | Power Management (PMIC) |
| Pins | 16 |

## CAD (KiCad official)

- Symbol: `UC3825ADWTR`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SOIC-16-300mil (KiCad packages3D, STEP)
- 3D model files: `uc3825adwtr-etched.step` / `uc3825adwtr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `uc3825adwtr.step` / `uc3825adwtr.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/uc3825a) (25 pp, sha256 `282207a34ca7cf7a`, 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/uc3825adwtr-datasheet.pdf)