# LM25085AMY

**Texas Instruments** · DC-DC Converters · MSOP-8-EP

LM25085AMY from Texas Instruments, in a MSOP-8-EP. 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 | ADJ | passive | Current limit adjust: the current limit threshold is set by an external resistor from VIN to ADJ, working with the sense resistor or the PFET RDS(ON), and the pin has a 40 µA internal current sink with a recommended 1000 pF filter capacitor (CADJ). |
| 2 | RT | input | An external resistor from VIN to RT sets the buck switch on-time and switching frequency, and grounding this pin shuts down the controller. |
| 3 | FB | input | Voltage feedback from the regulated output to the regulation and over-voltage comparators, with a regulation level of 0.9V. |
| 4 | GND | power_in | Circuit ground, the ground reference for all internal circuitry. |
| 5 | ISEN | input | Current sense input for current limit detection: connect to the PFET drain when using RDS(ON) sensing, or to the PFET source and sense resistor when using a current sense resistor. |
| 6 | PGATE | output | Gate driver output that connects to the gate of the external PFET; it swings between VIN (Q1 off) and the VCC pin voltage (Q1 on). |
| 7 | VCC | power_out | Output of the gate driver bias regulator, which is negative relative to VIN; a low-ESR capacitor is required from VIN to VCC, placed as close as possible to the pins. |
| 8 | VIN | power_in | Input supply voltage with an operating range of 4.5V to 42V; a low-ESR bypass capacitor must be located as close as possible to the VIN and GND pins. |
| 9 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | MSOP-8-EP |
| Category | Power Management (PMIC) |
| Pins | 9 |

## CAD (KiCad official)

- Symbol: `LM25085AMY`
- Footprint: `Package_SO:MSOP-8-1EP_3x3mm_P0.65mm_EP1.5x1.8mm`
- 3D model: MSOP-8-EP (KiCad packages3D, STEP)
- 3D model files: `lm25085amy-etched.step` / `lm25085amy-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm25085amy.step` / `lm25085amy.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/lm25085a) (36 pp, sha256 `941a26173c0d4ed5`, retrieved 2026-10-10, tier: lcsc)
- **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/lm25085amy-datasheet.pdf)